JEE Main Chemistry question
How many of the following Grignard-based reactions are correctly represented? (a) Phenylmagnesium bromide, treated with (i) ethylene oxide and then (ii) , gives 2-phenylethanol. (b) Phenylmagnesium bromide, treated with (i) and then (ii) , gives benzyl alcohol (). (c) Cyclohexylmagnesium bromide, treated with (i) a cyclic ketone and then (ii) , gives a tertiary cyclohexanol derivative.
Answer: 3
Solution
In (a), the Grignard reagent opens the strained epoxide ring of ethylene oxide, extending the chain by two carbons and giving, after acidic work-up, 2-phenylethanol — correctly represented. In (b), addition to formaldehyde's carbonyl followed by work-up gives
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