Question

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

• A. Saytzeff's Rule
• B. Hund’s Rule
• C. Hofmann Rule
• D. Huckel’s Rule

Answer 1

The Correct Option is A

$CH_3 - CH(Br) - CH_2 - CH_2 - CH_3 \xrightarrow{alc. KOH}$
$\underset{\text{1 - pentene (minor)}}{CH_2 = CH - CH_2 - CH_2 - CH_3} + \underset{\text{2 - pentene(major)}}{CH_3 - CH = CH - CH_2 - CH_3}$
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