Chemistry - Halogen Derivative Question with Solution | TestHub

Question Explanation: A γ-lactone reacts with two equivalents of CH₃MgBr then acid; identify the major organic product after ring-opening and workup.

Concept:

This question is based on Nucleophilic acyl substitution followed by addition reaction of Grignard reagent.

Solution: Grignard reagent (CH₃MgBr) attacks the lactone, opening the ring. A second CH₃MgBr attacks the carbonyl forms dialcoxide. Acidic workup yields a diol.