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Aldehydes, Ketones and Carboxylic Acids · Question 69

AIPMT 2006MCQEasy📈 Topic in 38% papers+4−1
1

Nucleophilic addition reaction will be most favoured in

  1. CH3CHO
  2. CH3-CH2-CH2- O \|C-CH3
  3. (CH3)2C=O
  4. CH3CH2CHO

Answer

(1) CH3CHO

Solution

As per NCERT, aldehydes are generally more reactive than ketones in nucleophilic addition reactions due to steric and electronic reasons: two alkyl groups hinder the approach of the nucleophile and reduce the electrophilicity of the carbonyl carbon more than one.

⇒ Ketones (pentan-2-one, acetone) are less reactive than the aldehydes.

⇒ Between the aldehydes, the CH3 group (smaller, weaker +I) leaves the carbonyl carbon more electrophilic than C2H5.

∴ Reactivity: CH3CHO > CH3CH2CHO > (CH3)2CO > CH3CH2CH2COCH3

Answer: (1)

AIPMT 2006

Keep practising — Aldehydes, Ketones and Carboxylic Acids

2

Self condensation of two moles of ethyl acetate in presence of sodium ethoxide yields

  1. ethyl propionate
  2. ethyl butyrate
  3. acetoacetic ester
  4. methyl acetoacetate
AIPMT 2006
3

In a set of reactions acetic acid yielded a product D. CH3COOH SOCl2 A [anhy. AlCl3]benzene B HCN C HOH D The structure of D would be

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2005
4

When m-chlorobenzaldehyde is treated with 50% KOH solution, the product(s) obtained is (are)

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2003
5

A and B in the following reactions are : [figure]

  1. [figure]
  2. [figure]
  3. A = RR'CHCN, B = NaOH
  4. [figure]
AIPMT 2003
6

[figure] In the above reaction product P is

  1. [figure]
  2. [figure]
  3. [figure]
  4. C6H5- O \|C-C6H5
AIPMT 2002
7

In the following reaction product P is R- O \|C-Cl [Pd-BaSO4]H2 P

  1. RCH2OH
  2. RCOOH
  3. RCHO
  4. RCH3
AIPMT 2002
8

[figure] Product 'P' in the above reaction is

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2002
9

First product of the reaction between RCHO and NH2NH2 is

  1. RCH=NNH2
  2. RCH=NH
  3. RCH2NH2
  4. RCON3
AIPMT 2000
10

Benzoic acid may be converted into ethyl benzoate by reaction with :

  1. ethyl alcohol
  2. ethyl alcohol and dry HCl
  3. ethyl chloride
  4. sodium ethoxide.
AIPMT 2000
11

Reduction by LiAlH4 of hydrolysed product of an ester gives

  1. two alcohols
  2. two aldehydes
  3. one acid and one alcohol
  4. two acids.
AIPMT 2000

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