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  4. The major product formed in dehydrohalogenation reaction of 2-Bromo pentane is Pent-2-ene. This product formation is based on ?

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Q. The major product formed in dehydrohalogenation reaction of $2-Bromo$ pentane is $Pent-2-ene$. This product formation is based on ?

NEETNEET 2021Alcohols Phenols and Ethers

Solution:

$CH_3 - CH(Br) - CH_2 - CH_2 - CH_3 \xrightarrow{alc. KOH}$
$\underset{\text{1 - pentene (minor)}}{CH_2 = CH - CH_2 - CH_2 - CH_3} + \underset{\text{2 - pentene(major)}}{CH_3 - CH = CH - CH_2 - CH_3}$
During dehydrohalogenation most stable alkene is formed by Saytzeff rule. According to Saytzeff’s rule an alkene with more number of hyperconjugated
hydrogens is the major product