The dehydrohalogenation of an alkyl halide to produce an alkene can be brought about by using

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aqueous KOH

alcoholic KOH

$conc. H_{2} {SO}_{4}$

${AlCl}_{3}$

answer is B.

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Detailed Solution

1. The reagent used to dehydrohalogenate alkyl halides is known as KOH.
2. When we use alcoholic potassium hydroxide, also known as KOH, as a reagent, the negative part of the reagent, OH, acts as a base and abstracts the beta hydrogen from the saturated substrate (alkyl hallide) present and trasforms it to an alkene in the product, going through an elimination reaction.

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