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(B) The reaction is a Clemmensen reduction $(Zn(Hg)/HCl, \Delta)$ of a $\gamma$-hydroxy aldehyde.$1$. The aldehyde group $(-CHO)$ is reduced to a meth

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$C_6H_5-CH=C(CH_3)-C_2H_5$

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(B) The reaction is a Clemmensen reduction $(Zn(Hg)/HCl, \Delta)$ of a $\gamma$-hydroxy aldehyde.$1$. The aldehyde group $(-CHO)$ is reduced to a methyl group $(-CH_3)$ under Clemmensen conditions.$2$. The acidic medium and heat promote the dehydration of the $\gamma$-hydroxy group $(-OH)$ to form a stable conjugated alkene.$3$. The intermediate formed is $C_6H_5-CH(OH)-CH(CH_3)-CH_2-CH_3$. Dehydration of this alcohol occurs to form the most stable, conjugated alkene, $C_6H_5-CH=C(CH_3)-CH_2-CH_3$ (which is $C_6H_5-CH=C(CH_3)-C_2H_5$).

The major product formed in the following reaction is:

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