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Chemistry Question on Chemical Reactions

The major product formed in dehydrohalogenation reaction of 2−Bromo2-Bromo pentane is Pent−2−enePent-2-ene. This product formation is based on ?

A

Saytzeff's Rule

B

Hund’s Rule

C

Hofmann Rule

D

Huckel’s Rule

Answer

Saytzeff's Rule

Explanation

Solution

CH3−CH(Br)−CH2−CH2−CH3→alc.KOHCH_3 - CH(Br) - CH_2 - CH_2 - CH_3 \xrightarrow{alc. KOH}
CH2=CH−CH2−CH2−CH31 - pentene (minor)+CH3−CH=CH−CH2−CH32 - pentene(major)\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