Question

Which of the following is the most stable alkene?

• A. $RCH _{2}= CH _{2} R$
• B. $RCH = CHR$
• C. $R _{2} C = CR _{2}$
• D. $CH _{2}= CH _{2}$

Answer 1

Answer: (C)

$R _{2} C = CR _{2}$

Answer 2

Alkenes are reactive due to the presence of double bond. The $\pi$ -electrons are loosely held and are therefore, earily polaisable. So more the number of $e ^{-1}$ releasing alkyl group on the double bond, lesser is the stability.