MHT CET Chemistry question

2, 3-dimethyl butanoic acid can be obtained from dry ice using

Answer: (A)

Solution

Grignard reagent + (dry ice) followed by hydrolysis puts the COOH group on the carbon bearing MgBr: \mathrm{(CH_{3})_{2}CH-CH(CH_{3})MgBr} gives

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Question ID VK-080845