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Aldehydes, Ketones and Carboxylic Acids · Question 67

AIPMT 2007MCQEasy📈 Topic in 12% papers+4−1
1

Which of the following represents the correct order of the acidity in the given compounds ?

  1. FCH2COOH > CH3COOH > BrCH2COOH > ClCH2COOH
  2. BrCH2COOH > ClCH2COOH > FCH2COOH > CH3COOH
  3. FCH2COOH > ClCH2COOH > BrCH2COOH > CH3COOH
  4. CH3COOH > BrCH2COOH > ClCH2COOH > FCH2COOH

Answer

(3) FCH2COOH > ClCH2COOH > BrCH2COOH > CH3COOH

Solution

As per NCERT, electron-withdrawing groups increase the acidity of carboxylic acids by stabilising the carboxylate ion through –I effect.

−I effect: F > Cl > Br (order of electronegativity); acetic acid has no halogen and its CH3 group shows +I effect, so it is the weakest.

⇒ FCH2COOH (pKa 2.66) > ClCH2COOH (2.86) > BrCH2COOH (2.90) > CH3COOH (4.76)

Answer: (3)

AIPMT 2007

Keep practising — Aldehydes, Ketones and Carboxylic Acids

2

A carbonyl compound reacts with hydrogen cyanide to form cyanohydrin which on hydrolysis forms a racemic mixture of α-hydroxy acid. The carbonyl compound is

  1. formaldehyde
  2. acetaldehyde
  3. acetone
  4. diethyl ketone
AIPMT 2006
3

Nucleophilic addition reaction will be most favoured in

  1. CH3CHO
  2. CH3-CH2-CH2- O \|C-CH3
  3. (CH3)2C=O
  4. CH3CH2CHO
AIPMT 2006
4

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
5

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
6

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
7

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

  1. [figure]
  2. [figure]
  3. A = RR'CHCN, B = NaOH
  4. [figure]
AIPMT 2003
8

[figure] In the above reaction product P is

  1. [figure]
  2. [figure]
  3. [figure]
  4. C6H5- O \|C-C6H5
AIPMT 2002
9

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
10

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2002
11

First product of the reaction between RCHO and NH2NH2 is

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

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