Q. Which one is a nucleophilic substitution reaction among the following?
A) CH₃CHO + HCN → CH₃CH(OH)CN
B) CH₃–CH=CH₂ + H₂O —(H⁺)→ CH₃–CH(OH)–CH₃
C) RCHO + R′MgX → R–CH(OH)–R′
D) CH₃–CH₂–CH(CH₃)–CH₂Br + NH₃ → CH₃–CH₂–CH(CH₃)–CH₂NH₂
Explanation
[Solution from source] In the reaction of the primary alkyl bromide with NH₃, the nucleophile NH₃ replaces Br⁻, which is nucleophilic substitution. The cyanohydrin and Grignard reactions are nucleophilic additions to C=O, and acid-catalysed hydration of propene is electrophilic addition. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.