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(A) The reaction involves the addition of a Grignard reagent $(C_2H_5MgBr)$ to an $\alpha,\beta$-unsaturated ketone (but$-3-$en$-2-$one). Grignard rea

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(A) The reaction involves the addition of a Grignard reagent $(C_2H_5MgBr)$ to an $\alpha,\beta$-unsaturated ketone (but$-3-$en$-2-$one). Grignard reagents typically undergo $1,2$-addition to the carbonyl group of $\alpha,\beta$-unsaturated ketones to form an allylic alcohol. Step $1$: The ethyl group $(C_2H_5^-)$ from $C_2H_5MgBr$ attacks the carbonyl carbon,forming an alkoxide intermediate. Step $2$: Subsequent protonation with $H_2O$ yields the allylic alcohol,$3$-methylpent-$1$-en-$3$-ol. Although $HCl$ is mentioned in the reaction conditions,under standard laboratory conditions for Grignard reactions,the primary product isolated is the alcohol. Among the given options,the structure corresponding to $3$-methylpent-$1$-en-$3$-ol is the correct major product.

Consider the above reaction,the major product $'P'$ is:-

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