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Aldehydes, Ketones and Carboxylic Acids

JEE Main 2024 (Online) 30th January Evening ShiftMCQEasy📈 Topic in 10% papers+4−1
Ques. 1JEE Main 2024, 30 January (Evening Shift)

m-chlorobenzaldehyde on treatment with 50% KOH solution yields :

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

Answer

(1) [figure]

Solution

[figure]

∵ ArCHO has no α-H ⇒ with conc. (50%) KOH it undergoes Cannizzaro reaction: one molecule oxidised to ArCOO , the other reduced to ArCH2OH

(B), (D): –Cl replaced by –OH ⇒ (B), (D) are wrong (aryl C–Cl is not attacked by KOH)

(C): a benzoin, formed only with CN catalyst ⇒ (C) is wrong

Answer: (1)

Keep practising — Aldehydes, Ketones and Carboxylic Acids

Ques. 2JEE Main 2024, 29 January (Morning Shift)

The final product A formed in the following multistep reaction sequence is [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 3JEE Main 2024, 29 January (Morning Shift)

From the compounds given below, number of compounds which give positive Fehling's test is . Benzaldehyde, Acetaldehyde, Acetone, Acetophenone, Methanal, 4-nitrobenzaldehyde, cyclohexane carbaldehyde.

Ques. 4JEE Main 2024, 29 January (Evening Shift)

Identify the reagents used for the following conversion [figure]

  1. A = LiAlH4, B = NaOH(aq), C = NH2-NH2/KOH, ethylene glycol
  2. A = DIBAL-H, B = NaOH(aq), C = NH2-NH2/KOH, ethylene glycol
  3. A = LiAlH4, B = NaOH(alc), C = Zn/HCl
  4. A = DIBAL-H, B = NaOH(alc), C = Zn/HCl
Ques. 5JEE Main 2024 (Online)

Match List-I with List-II and choose the correct option.

  1. A-II, B-IV, C-I, D-III
  2. A-I, B-II, C-III, D-IV
  3. A-IV, B-III, C-II, D-I
  4. A-II, B-I, C-IV, D-III

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