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Aldehydes, Ketones and Carboxylic Acids

AIPMT 2002MCQEasy📈 Topic in 50% papers+4−1
Ques. 1AIPMT 2002

[figure] In the above reaction product P is

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

Answer

(2) [figure]

Solution

As per NCERT, Grignard reagents react with carbon dioxide (dry ice) to form salts of carboxylic acids, which on acidification give the carboxylic acid.

C6H5MgBr + CO2 C6H5COOMgBr

C6H5COOMgBr H3O+ C6H5COOH + Mg(OH)Br

∴ P is benzoic acid.

Answer: (2)

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Ques. 2AIPMT 2002

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

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

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 4AIPMT 2000

First product of the reaction between RCHO and NH2NH2 is

  1. RCH=NNH2
  2. RCH=NH
  3. RCH2NH2
  4. RCON3
Ques. 5AIPMT 2000

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.
Ques. 6AIPMT 2000

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.

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