Aldehydes, Ketones & Carboxylic Acids Practice Questions - DPP for JEE

 Page 1


1. (a)
2. (c) Cannizzaro reaction - when an aldehyde containing no a – H
undergo reaction in presence of 50% KOH. It disproportionates to
form a molecule of carboxylic acid and a molecule of alcohol.
2 
3. (d)
4. (c) Due to resonance in carboxylate ion, the double bond character of
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1. (a)
2. (c) Cannizzaro reaction - when an aldehyde containing no a – H
undergo reaction in presence of 50% KOH. It disproportionates to
form a molecule of carboxylic acid and a molecule of alcohol.
2 
3. (d)
4. (c) Due to resonance in carboxylate ion, the double bond character of
C = O bond in carboxylic acids is greatly reduced as compared to
that in aldehydes and ketones.
5. (b)
This reaction is known as Clemmensen's reduction.
6. (a)
7. (d) Since, C when heated with Br
2
 in presence of KOH produces
ethylamine, hence it must be propanamide and hence the organic
compound (A) will be propanoic acid. The reactions follows.
Page 3


1. (a)
2. (c) Cannizzaro reaction - when an aldehyde containing no a – H
undergo reaction in presence of 50% KOH. It disproportionates to
form a molecule of carboxylic acid and a molecule of alcohol.
2 
3. (d)
4. (c) Due to resonance in carboxylate ion, the double bond character of
C = O bond in carboxylic acids is greatly reduced as compared to
that in aldehydes and ketones.
5. (b)
This reaction is known as Clemmensen's reduction.
6. (a)
7. (d) Since, C when heated with Br
2
 in presence of KOH produces
ethylamine, hence it must be propanamide and hence the organic
compound (A) will be propanoic acid. The reactions follows.
 
8. (d)
(a)
(b)
(c)
Page 4


1. (a)
2. (c) Cannizzaro reaction - when an aldehyde containing no a – H
undergo reaction in presence of 50% KOH. It disproportionates to
form a molecule of carboxylic acid and a molecule of alcohol.
2 
3. (d)
4. (c) Due to resonance in carboxylate ion, the double bond character of
C = O bond in carboxylic acids is greatly reduced as compared to
that in aldehydes and ketones.
5. (b)
This reaction is known as Clemmensen's reduction.
6. (a)
7. (d) Since, C when heated with Br
2
 in presence of KOH produces
ethylamine, hence it must be propanamide and hence the organic
compound (A) will be propanoic acid. The reactions follows.
 
8. (d)
(a)
(b)
(c)
(d) (Oil of wintergreen)
9. (b) NaBH
4
 selectively reduces the aldehyde group to alcohol without
affecting double bond in a organic compound. So, X is NaBH
4
.
C
6
 H
5
 CH = CHCHO  C
6
 H
5
 CH = CHCH
2
OH
10. (b)
11. (c)
This process is known as esterification.
12. (a) Addition of HCN to carbonyl compounds is nucleophilic addition
reaction. The order of reactivity of carbonyl compounds is
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1. (a)
2. (c) Cannizzaro reaction - when an aldehyde containing no a – H
undergo reaction in presence of 50% KOH. It disproportionates to
form a molecule of carboxylic acid and a molecule of alcohol.
2 
3. (d)
4. (c) Due to resonance in carboxylate ion, the double bond character of
C = O bond in carboxylic acids is greatly reduced as compared to
that in aldehydes and ketones.
5. (b)
This reaction is known as Clemmensen's reduction.
6. (a)
7. (d) Since, C when heated with Br
2
 in presence of KOH produces
ethylamine, hence it must be propanamide and hence the organic
compound (A) will be propanoic acid. The reactions follows.
 
8. (d)
(a)
(b)
(c)
(d) (Oil of wintergreen)
9. (b) NaBH
4
 selectively reduces the aldehyde group to alcohol without
affecting double bond in a organic compound. So, X is NaBH
4
.
C
6
 H
5
 CH = CHCHO  C
6
 H
5
 CH = CHCH
2
OH
10. (b)
11. (c)
This process is known as esterification.
12. (a) Addition of HCN to carbonyl compounds is nucleophilic addition
reaction. The order of reactivity of carbonyl compounds is
Aldehydes (smaller to higher) Ketones (smaller to higher), Then
PhCOPh < Ph.COCH
3
  < CH
3
COCH
3
 < HCHO  
The lower reactivity of ketones is due to presence of two alkyl group
which shows +I effect. The reactivity of ketones decreases as the
size of alkyl group increases.
13. (b)
 
14. (a) The correct order of increasing acid strength
(Me)
2
CH.COOH < CH
3
COOH < MeOCH
2
COOH  <  CF
3
COOH
Electron withdrawing groups increase the acid strength and electron
donating groups decrease the acid strength.
15. (b) Acetic acid does not have –CHO grouping, while all others
(HCOOH, HCHO and CH
3
CHO) have –CHO grouping
16. (b) Pinacolone is oxidation product of pinacol.