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JEE Main levelOne or more correct optionsDifficulty 2 of 3hx030

In which of the following reactions is an alkene the major organic product?

A2-bromopropane with alcoholic $KOH$
Bbromoethane with aqueous $KOH$
C2-bromo-2-methylbutane with alcoholic $KOH$
Dbromobenzene with alcoholic $KOH$

Answer: A, C

Alcoholic

KOH

promotes E2 dehydrohalogenation, so 2-bromopropane gives propene and 2-bromo-2-methylbutane gives mainly 2-methylbut-2-ene. Aqueous

KOH

with bromoethane gives ethanol by substitution. Bromobenzene has no

β

-hydrogen on an

s p^{3}

carbon and does not react.

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