Which of the following alkenes is most stable?

Options

A. `CH_(3)CH=CH_(2)`
B.
C.
D.

Answer

D

Explanation

The pattern of stabilites is related to the number of alkyl groups bonded to the `C` atoms of the double bond . The greater the number of attached alkyl groupg (i.e., the more highly substituted the `C` atoms of the double bond), the greater is the alkene's stability.
The trans-isomer is more stable than the cis-isomer because the two larger substituents are located farther apart in the trans-isomer than in the cis-isomer. There is less crowding and less van der Waal's strain.
Compared `(4)` being the most substituted is the most stable alkene. The order of stability is
`(4) gt (3) gt (2) gt (1)`