The major product formed in the following rea | vedclass

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(D) The reaction involves the acid-catalyzed addition of an alcohol to a vinyl ether,specifically $3,4-$dihydro-$2$$H$-pyran. $1$. The acid catalyst $

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(D) The reaction involves the acid-catalyzed addition of an alcohol to a vinyl ether,specifically $3,4-$dihydro-$2$$H$-pyran. $1$. The acid catalyst $(H^+)$ protonates the double bond of the vinyl ether to form a stable resonance-stabilized oxocarbenium ion. $2$. The alcohol (isopentyl alcohol) acts as a nucleophile and attacks the electrophilic carbon of the oxocarbenium ion. $3$. Subsequent deprotonation yields the final acetal product. This reaction is commonly used for the protection of alcohols as tetrahydropyranyl $(THP)$ ethers. The structure of the product is an isopentyl tetrahydropyranyl ether.

The major product formed in the following reaction is .... .

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