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Aldehydes, Ketones and Carboxylic Acids

AIPMT 2012 (Prelims)MCQEasy📈 Topic in 12% papers+4−1
Ques. 1AIPMT 2012 (Prelims)

The correct order of decreasing acid strength of trichloroacetic acid (A), trifluoroacetic acid (B), acetic acid (C) and formic acid (D) is

  1. B > A > D > C
  2. B > D > C > A
  3. A > B > C > D
  4. A > C > B > D

Answer

(1) B > A > D > C

Solution

Electron-withdrawing (−I) groups stabilise the carboxylate ion and increase acidity; electron-donating (+I) groups decrease it.

F is more electronegative than Cl CF3COOH > CCl3COOH

HCOOH has no +I alkyl group, while CH3 in CH3COOH is +I HCOOH > CH3COOH

B > A > D > C

Answer: (1)

Keep practising — Aldehydes, Ketones and Carboxylic Acids

Ques. 2AIPMT 2012 (Prelims)

Predict the products in the given reaction. [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 3AIPMT 2012 (Prelims)

Acetone is treated with excess of ethanol in the presence of hydrochloric acid. The product obtained is

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 4AIPMT 2011 (Mains)

The order of reactivity of phenyl magnesium bromide (PhMgBr) with the following compounds: [figure]

  1. III > II > I
  2. II > I > III
  3. I > III > II
  4. I > II > III
Ques. 5AIPMT 2011 (Prelims)

Clemmensen reduction of a ketone is carried out in the presence of which of the following?

  1. Glycol with KOH
  2. Zn-Hg with HCl
  3. LiAlH4
  4. H2 and Pt as catalyst
Ques. 6AIPMT 2010 (Mains)

Following compounds are given (i) CH3CH2OH (ii) CH3COCH3 (iii) CH3- CH3 |CHOH (iv) CH3OH Which of the above compound(s), on being warmed with iodine solution and NaOH, will give iodoform?

  1. (i), (iii) and (iv)
  2. Only (ii)
  3. (i), (ii) and (iii)
  4. (i) and (ii)
Ques. 7AIPMT 2010 (Mains)

Which one of the following compounds will be most readily dehydrated?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 8AIPMT 2010 (Prelims)

In a set of reactions, ethylbenzene yielded a product D. [figure] D would be

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 9AIPMT 2010 (Prelims)

Which of the following reactions will not result in the formation of carbon-carbon bonds?

  1. Reimer-Tiemann reaction
  2. Cannizzaro reaction
  3. Wurtz reaction
  4. Friedel-Crafts acylation
Ques. 10AIPMT 2010 (Prelims)

Among the given compounds, the most susceptible to nucleophilic attack at the carbonyl group is

  1. CH3COOCH3
  2. CH3CONH2
  3. CH3COOCOCH3
  4. CH3COCl
Ques. 11AIPMT 2009

Propionic acid with Br2/P yields a dibromo product. Its structure would be

  1. [figure]
  2. CH2(Br)-CH2-COBr
  3. [figure]
  4. CH2(Br)-CH(Br)-COOH

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