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(D) The reactant is $4$-chlorobutan-$1$-ol $(HO-CH_2-CH_2-CH_2-CH_2-Cl)$.When treated with alcoholic $KOH$,which is a strong base,an intramolecular nu

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Tetrahydrofuran

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(D) The reactant is $4$-chlorobutan-$1$-ol $(HO-CH_2-CH_2-CH_2-CH_2-Cl)$.When treated with alcoholic $KOH$,which is a strong base,an intramolecular nucleophilic substitution reaction occurs.The hydroxyl group $(-OH)$ is deprotonated by the base to form an alkoxide ion $(-O^-)$.This alkoxide ion then attacks the carbon atom bonded to the chlorine atom,leading to the displacement of the chloride ion $(Cl^-)$ via an intramolecular $S_N2$ mechanism.This results in the formation of a five-membered cyclic ether,which is tetrahydrofuran.

What is the major product of the following reaction?
$HO-CH_2-CH_2-CH_2-CH_2-Cl \xrightarrow{Alc. KOH} ?$

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What is the major product of the following reaction?$HO-CH_2-CH_2-CH_2-CH_2-Cl \xrightarrow{Alc. KOH} ?$