Chem 31.1 Review for Finals
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Transcript of Chem 31.1 Review for Finals
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Review for Finals
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From the given compounds below,
which will not form a silver
mirror in Tollens Test but will give a positive result in Iodoform
Test?
3-hexanol
3-pentanone
2-methylcyclohexanal
phenylethanone
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From the given compounds below,
which will not form a silver
mirror in Tollens Test but will give a positive result in Iodoform
Test?
3-hexanol
3-pentanone
2-methylcyclohexanal
phenylethanone
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Why was Ingrain dyeing employed
in the Sudan I experiment? Fully formed Sudan I is too large to anchor itself on the cloth
The cloth and Sudan I have the same intermolecular forces of attraction
Sudan I is able to form chemical interaction with the cloth via salt
linkages
Sudan I can bond well with the functional groups present in the cloth
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Why was Ingrain dyeing employed
in the Sudan I experiment? Fully formed Sudan I is too large to anchor itself on the cloth
The cloth and Sudan I have the same intermolecular forces of attraction
Sudan I is able to form chemical interaction with the cloth via salt
linkages
Sudan I can bond well with the functional groups present in the cloth
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Which will react the fastest in
Seliwanoffs Test?
Fructose
Glucose
Galactose
Starch
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Which will react the fastest in
Seliwanoffs Test?
Fructose
Glucose
Galactose
Starch
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Which of the following cannot be
used as a starting material for
soap making?
Cooking oil
Mayonnaise
Glycerol
Lye
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Which of the following cannot be
used as a starting material for
soap making?
Cooking oil
Mayonnaise
Glycerol
Lye
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Which substituent enhances the
acidity of carboxylic acids when
bonded directly to the acyl
carbon?
-CH2CH3
-OCH3
-OH
-NO2
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Which substituent enhances the
acidity of carboxylic acids when
bonded directly to the acyl
carbon?
-CH2CH3
-OCH3
-OH
-NO2
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Hinsberg test for N-
methylethanamine will yield a
product that is ___ in excess
NaOH and ___ in 5% HCl acid.
Soluble, insoluble
Soluble, soluble
Insoluble, insoluble
Insoluble, soluble
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Hinsberg test for N-
methylethanamine will yield a
product that is ___ in excess
NaOH and ___ in 5% HCl acid.
Soluble, insoluble
Soluble, soluble
Insoluble, insoluble
Insoluble, soluble
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Which among the following
combination (compound-reagent-
result) is correct?
Acetone - Ag(NH3)2+ silver mirror
Propanal Na citrate, NaHCO3 and CuSO4 in water brick red ppt
Formalin Schiffs reagent light pink color
Cylopentanone I2 in KI and NaOH yellow ppt
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Which among the following
combination (compound-reagent-
result) is correct?
Acetone - Ag(NH3)2+ silver mirror
Propanal Na citrate, NaHCO3 and CuSO4 in water brick red ppt
Formalin Schiffs reagent light pink color
Cylopentanone I2 in KI and NaOH yellow ppt
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Which of the following is not a
property of soap? Soaps have hydrophobic and hydrophilic parts
Soaps are the result of the reaction between glucose and potassium
hydroxide
The hydrophobic part of soap is its nonpolar tail
The nonpolar part causes the formation of micelles
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Which of the following is not a
property of soap? Soaps have hydrophobic and hydrophilic parts
Soaps are the result of the reaction between glucose and potassium
hydroxide
The hydrophobic part of soap is its nonpolar tail
The nonpolar part causes the formation of micelles
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Esters form a magenta colored
complex with FeCl3 after
treatment with ______.
NH4OH with alcoholic KOH
Alcoholic NH4Cl and alcoholic KOH
Neutral NH4Cl and alcoholic KOH
Alcoholic NH2OHHCl and Alcoholic KOH
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Esters form a magenta colored
complex with FeCl3 after
treatment with ______.
NH4OH with alcoholic KOH
Alcoholic NH4Cl and alcoholic KOH
Neutral NH4Cl and alcoholic KOH
Alcoholic NH2OHHCl and Alcoholic KOH
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Which of the following is formed
upon addition of benzensulfonyl
chloride and NaOH with aniline?
Sulfonamine
Sulfonamide
Sulfoxamine
Sulfonylamide
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Which of the following is formed
upon addition of benzensulfonyl
chloride and NaOH with aniline?
Sulfonamine
Sulfonamide
Sulfoxamine
Sulfonylamide
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Which of the following acyl
compound-alcohol pair produces
ester in the least amount?
Methanoic anhydride and ethanol
Acetic acid and butanol
Sodium butanoate and propanol
Ethanamide and 2-propanol
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Which of the following acyl
compound-alcohol pair produces
ester in the least amount?
Methanoic anhydride and ethanol
Acetic acid and butanol
Sodium butanoate and propanol
Ethanamide and 2-propanol
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Ribonucleic Acid, RNA, contains
the sugar ribose. What test can
be used to detect its presence in
a sample of RNA?
Hydroxamic Acid Test
Bials Test
Ninhydrin Test
Hinsberg Test
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Ribonucleic Acid, RNA, contains
the sugar ribose. What test can
be used to detect its presence in
a sample of RNA?
Hydroxamic Acid Test
Bials Test
Ninhydrin Test
Hinsberg Test
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Which type of amine cannot be
characterized using Hinsbergs method?
Primary Amine
Secondary Amine
Tertiary Amine
Amphoteric Amine
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Which type of amine cannot be
characterized using Hinsbergs method?
Primary Amine
Secondary Amine
Tertiary Amine
Amphoteric Amine
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A soap molecule is a/an
Ester
Carboxylic acid
Amide
Carboxylate Salt
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A soap molecule is a/an
Ester
Carboxylic acid
Amide
Carboxylate Salt
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The product of the hydrolysis of this
acid derivative changes a litmus paper
from red to blue and produces a
distinct sour smell. What could be this
compound?
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The product of the hydrolysis of this
acid derivative changes a litmus paper
from red to blue and produces a
distinct sour smell. What could be this
compound?
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Which of the following would prevent
the formation of side products in the
synthesis of Sudan I?
Preparing phenyldiazonium chloride solution in a acidic medium
Recrystallization of the product
Preparing -naphthol solution in acidic medium
None of the above
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Which of the following would prevent
the formation of side products in the
synthesis of Sudan I?
Preparing phenyldiazonium chloride solution in a acidic medium
Recrystallization of the product
Preparing -naphthol solution in acidic medium
None of the above
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What test/reagent may be used
to confirm the product of
methanol and benzoic acid upon
refluxing with H2SO4 ?
Friedel-Crafts alkylation
5% NaHCO3
Lucas Test
Hydroxamic Acid Test
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What test/reagent may be used
to confirm the product of
methanol and benzoic acid upon
refluxing with H2SO4 ?
Friedel-Crafts alkylation
5% NaHCO3
Lucas Test
Hydroxamic Acid Test
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3-phenylbutanal will give positive
result on the following tests
except:
Reaction with 2,4-DNPH
Schiffs test
Iodoform test
Benedicts test
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3-phenylbutanal will give positive
result on the following tests
except:
Reaction with 2,4-DNPH
Schiffs test
Iodoform test
Benedicts test
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Modified True or False
1. Seliwanoffs test is a test for RNA.
2. Compounds that yield the same
osazone are known as enantiomers.
3. Soap molecules tend to form
micelles due to their hydrophobic
heads.
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Modified True or False
1. Bials Test is a test for RNA.
2. Compounds that yield the same
osazone are known as epimers.
3. Soap molecules tend to form
micelles due to their hydrophobic
tails.
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4. Reaction of acetic acid with FeCl3
gives a flesh colored precipitate.
5. Refluxing purifies the synthesized
ester through removal of excess water
by evaporation.
6. In the synthesis of ester, H2SO4 acts
as the catalyst by making the C=O of
the carboxylic acid a good leaving
group.
7. 2-pentanol and acetone cant be differentiated using Iodoform test.
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4. Reaction of acetic acid with FeCl3
gives a Red solution/red complex.
5. Distillation purifies the synthesized
ester through removal of excess water
by evaporation.
6. In the synthesis of ester, H2SO4 acts
as the catalyst by making the O-H of
the carboxylic acid a good leaving
group.
7. 2-pentanol and acetone cant be differentiated using Iodoform test.
TRUE!
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8. The coupling reagent should contain
strongly electron donating groups to
facilitate the coupling reaction in the
synthesis of diazo compounds.
9. Diazotization requires primary
alkylamines to react with HONO to
produce the diazonium salt.
10. Base hydrolysis of primary amides
yields a vapor that turns litmus
paper red to blue.
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8. The coupling reagent should contain
strongly electron donating groups to
facilitate the coupling reaction in the
synthesis of diazo compounds. TRUE
9. Diazotization requires primary
aromatic amines to react with HONO
to produce the diazonium salt.
10. Base hydrolysis of primary amides
yields a vapor that turns litmus
paper red to blue. TRUE
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11. Cyclobutanol produces a yellow
orange precipitate with 2,4-DNPH.
12. In diazotization, sodium nitrite is
converted to HNO2, the primary
diazotization reagent.
13. Hydrolysis of polysaccharides takes
time due to several double bonds
that need to be broken.
14. Given 1 mole of triglyceride, three
moles of KOH is necessary for
saponification.
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11. Cyclobutanol produces a yellow
orange solution with 2,4-DNPH.
12. In diazotization, sodium nitrite is
converted to HNO2, the primary
diazotization reagent. TRUE
13. Hydrolysis of polysaccharides takes
time due to several glycosodic bonds
that need to be broken.
14. Given 1 mole of triglyceride, three
moles of KOH is necessary for
saponification. TRUE
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Azo DYES!!! Give the amine and
coupling compound. Eriochrome Black T- complexometric indicator
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Amine Coupling agent
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Azo DYES!!! Give the amine and
coupling compound.
Fast Yellow AB- food dye (harmful)
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AMINE
Coupling Agent
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Azo DYES!!! Give the amine and
coupling compound.
Alizarin Yellow R pH indicator
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Amine
Coupling Agent
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Azo DYES!!! From the reagents,
give the Azo Dye!
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Citrus Red 2 carcinogenic dye used on some skin of oranges
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Azo DYES!!! From the reagents,
give the Azo Dye!
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Methyl Red used as pH indicator
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CHEMICAL Differentiation! Give
test/reagent and visible result that
would differentiate the compounds.
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CHEMICAL Differentiation! Give
test/reagent and visible result that
would differentiate the compounds. FeCl3 colored complex
Lucas Test - layer
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CHEMICAL Differentiation! Give
test/reagent and visible result that
would differentiate the compounds.
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CHEMICAL Differentiation! Give
test/reagent and visible result that
would differentiate the compounds.
5% NaHCO3 - effervescence
2,4-DNPH yellow orange crystals
Tollens Test silver mirror
Benedicts Test brick red ppt
Schiffs Test purple/violet complex
pH acidic or solubility in NaOH
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CHEMICAL Differentiation! Give
test/reagent and visible result that
would differentiate the compounds.
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CHEMICAL Differentiation! Give
test/reagent and visible result that
would differentiate the compounds. Hinsberg Test
Dense layer/residue
Test for Nitrogen
Blue green solution
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CHEMICAL Differentiation! Give
test/reagent and visible result that
would differentiate the compounds. Iodoform yellow
ppt
Hinsberg Test - residue
Schiffs Test violet complex
T-butyl chloride, AlCl3 orange crystal
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Unknown Analysis: Draw the Structure of the
Unknown Compound Resveratrol a polyphenol found in the
skin of red grapes, with formula C14H12O3 Test/Reagent Observation/ Result Inference
Ignition test (1) Aromatic Ring present
Conc. H2SO4 soluble (2)
(3) White to yellow/orange
crystals
Aromatic ring is present
KMnO4 (4) Alkene part is present
(5) Yellow solution, negative Saturated part is absent
(6) Highly colored complex 3,5-disubstituted phenol is
present
Para-substituted phenol is
also present
2,4-DNPH Yellow solution, no ppt (7)
5% NaHCO3 NVR (8)
(9) negative Ester group is absent
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Unknown Analysis: Draw the Structure of the
Unknown Compound Resveratrol a polyphenol found in the
skin of red grapes, with formula C14H12O3 Test/Reagent Observation/ Result Inference
Ignition test Sooty Flame Aromatic Ring present
Conc. H2SO4 soluble Solubility class: N
AlCl3, t-butyl chloride White to yellow/orange
crystals
Aromatic ring is present
KMnO4 Decolorization, brown ppt Alkene part is present
Br2 in water, Light Yellow solution, negative Saturated part is absent
FeCl3 Highly colored complex 3,5-disubstituted phenol is
present
Para-substituted phenol is
also present
2,4-DNPH Yellow solution, no ppt No carbonyl group
5% NaHCO3 NVR No carboxylic acid part
Hydroxyamic Test negative Ester group is absent
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Unknown Analysis: Draw the Structure
of the Unknown Compound Resveratrol a polyphenol found in the
skin of red grapes, with formula C14H12O3
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Unknown Analysis: Draw the Structure of the
Unknown Compound Unknown compound with formula: C8H9O2N
Compound is para substituted Test/Reagent Observation Interference
5% HCl NVR (1)
(2) Yellow soln Not an aldehyde or
ketone
5% NaHCO3 NVR (3)
Benzenesulfonyl
chloride
No residue (4)
FeCl3 (5) Phenol group present
Hydroxamic acid test (6) No ester group
present
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Unknown Analysis: Draw the Structure of the
Unknown Compound Unknown compound with formula: C8H9O2N
Compound is para substituted Test/Reagent Observation Interference
5% HCl NVR Not basic
2,4-DNPH test Yellow soln Not an aldehyde or
ketone
5% NaHCO3 NVR Not strong acid no
RCOOH
Benzenesulfonyl
chloride, NaOH
Insoluble secondary amine
FeCl3 Colored complex Phenol group present
Hydroxamic acid test Clear solution No ester group
present
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Unknown compound with formula: C8H9O2N
Compound is para substituted
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Reminder for Final Exam:
Date: October 6, 2012 Saturday
Time: 4-6 pm
Coverage: expt 10 16
Review on different qualitative test (know reagents and result)