Compound X undergoes the following reaction s | vedclass

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(A) The reaction sequence represents an aldol condensation followed by dehydration,hydrogenation,and reduction. $1$. The final product is a primary al

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$3-$methylpentanal

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(A) The reaction sequence represents an aldol condensation followed by dehydration,hydrogenation,and reduction. $1$. The final product is a primary alcohol,which is obtained by the reduction of an aldehyde. $2$. The sequence shows that two molecules of an aldehyde undergo aldol condensation in the presence of $NaOH$ to form a $\beta$-hydroxy aldehyde. $3$. Upon heating,this undergoes dehydration to form an $\alpha,\beta$-unsaturated aldehyde. $4$. Hydrogenation with $H_2/Pd$ reduces the double bond,and $LiAlH_4$ reduces the aldehyde group to a primary alcohol. $5$. By reversing the steps,the starting material $X$ is identified as $3$-methylpentanal.

Compound $X$ undergoes the following reaction sequence. What is the structure of compound $X$?

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