In the given reaction,identify the product [X | vedclass

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(A) The starting material is a $2,3,4-trichlorotetrahydropyran$ derivative. The reaction involves the nucleophilic substitution of a chlorine atom by

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(A) The starting material is a $2,3,4-trichlorotetrahydropyran$ derivative. The reaction involves the nucleophilic substitution of a chlorine atom by a methoxide ion $(CH_3O^-)$ derived from methanol $(CH_3OH)$.In cyclic systems containing an oxygen atom (like tetrahydropyran),the carbon atom adjacent to the oxygen (the $\alpha$-carbon) is highly susceptible to nucleophilic attack due to the stabilization of the transition state by the lone pairs on the oxygen atom (anomeric effect or simply electronic stabilization).Therefore,the chlorine atom at the position adjacent to the oxygen atom is replaced by the $-OCH_3$ group.The product $[X]$ is the $2-methoxy-3,4-dichlorotetrahydropyran$ derivative,which corresponds to option $A$.

List-$I$ (Reaction)	List-$II$ (Name of reaction)
$A$. $2C_6H_5X + 2Na \xrightarrow{\text{Dry Ether}} C_6H_5-C_6H_5 + 2NaX$	$I$. Lucas reaction
$B$. $ArN_2^{+} X^{-} \xrightarrow[HCl]{Cu} ArCl + N_2 \uparrow + CuX$	$II$. Finkelstein reaction
$C$. $C_2H_5Br + NaI \xrightarrow{\text{Acetone}} C_2H_5I + NaBr$	$III$. Fittig reaction
$D$. $(CH_3)_3COH \xrightarrow[ZnCl_2]{HCl} (CH_3)_3CCl + H_2O$	$IV$. Gatterman reaction

In the given reaction,identify the product $[X]$:

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