Which of the following reaction produces most stable alkene ?

Options

A. 2-chloro butane
B. 2, 3-dichloro butane
C. 2, 2-dichloro butane
D. 2, 3-dichloro, 2, 3-dimethyl butane

Answer

D

Explanation

Molecular structure of given names of organic compounds are written as

According to Saytzeff’s rule, more substituted (alkylated) alkene are more stable. When the alkyl halide is treated with base, it undergo elimination reaction and produces alkane as follows:

Conjugation
Greater the conjugation greater will be the stability of product. Hence, D has maximum stability, the correct choice is (2, 3-dichloro, 2, 3-dimethyl butane) which is tabilised by conjugation as well as Saytzeff’s rule.