Question

Nucleophilic addition reaction will be most
favoured in
(a) (CH₃)₂C = O
(b) CH₃CH₂CHO O
(c) CH₃CHO ||
(d) CH₃— CH₂ — CH₂C— CH₃

Answer 1

Nucleophilic addition reaction will be most  favored in (c) CH₃CHO

Explanation:

• The carbonyl compound undergoes nucleophilic reaction. It is because oxygen has more electronegativity than carbon atom. The carbon get partial positive charge and is subjected nucleophilic attack.
• Aldehyde is more reactive than ketone towards nucleophiles. Aldehyde has one alkyl group which has more electron donating effect.
• The ketone has two alkyl groups which makes it more difficult to undergo nucleophilic attack.
• Thus, the order of nucleophilic addition is:

CH₃CHO > CH₃CH₂CHO > (CH₃)₂C = O >      O

                                                                         ║

                                      CH₃— CH₂ — CH₂ — C — CH₃