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(B) The reaction involves the acid-catalyzed addition of an alcohol $(RCH_2OH)$ to the double bond of $3,4-dihydro-2H-pyran$. This reaction proceeds t

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an acetal

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(B) The reaction involves the acid-catalyzed addition of an alcohol $(RCH_2OH)$ to the double bond of $3,4-dihydro-2H-pyran$. This reaction proceeds through the formation of a resonance-stabilized oxocarbenium ion intermediate. The alcohol acts as a nucleophile and attacks the electrophilic carbon of the oxocarbenium ion. After the loss of a proton $(H^+)$,the final product formed is a tetrahydropyranyl ether. Since the product contains an alkoxy group attached to a carbon atom that is also bonded to another oxygen atom (part of the ring),it is classified as an acetal (specifically,a cyclic acetal).

The major product of the following reaction is

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