The major product of this reaction is:

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(D) The reaction is a Prins reaction,which involves the electrophilic addition of an aldehyde (in this case,formaldehyde,$HCHO$) to an alkene in the p

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$1-$methyl$-2-$(hydroxymethyl)cyclohexan$-1-$ol

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(D) The reaction is a Prins reaction,which involves the electrophilic addition of an aldehyde (in this case,formaldehyde,$HCHO$) to an alkene in the presence of an acid catalyst $(H^+)$. $1$. The protonated formaldehyde acts as an electrophile and attacks the double bond of $1$-methylcyclohexene to form a carbocation intermediate. $2$. The carbocation is then attacked by water $(H_2O)$ to form the final product,which is $1$-methyl-$2$-(hydroxymethyl)cyclohexan-$1$-ol.

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