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Question 790009
JEE Chemistry · Hard

Aldehydes, Ketones and Carboxylic Acids: JEE Main MCQ

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JEE MainHardQuestion 790009

Question

The order of reactivity of carbonyl compounds towards nucleophilic addition is:
  1. A
    HCHO > RCH₂CHO > RCHO > R₂CO (ketone)
    Correct
  2. B
    R₂CO > RCHO > RCH₂CHO > HCHO
  3. C
    All equal
  4. D
    RCHO > HCHO > R₂CO

Correct answer

HCHO > RCH₂CHO > RCHO > R₂CO (ketone)

Explanation

Reactivity decreases as steric hindrance and electron donation from alkyl groups increases. Formaldehyde (no alkyl) is most reactive; ketones (two alkyl groups) least reactive among simple carbonyls.

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