Which of the following compounds will have the longest C = C bond?

Step-by-step solution

Have more α - H more conjugating structure. Show more hyperconjugation so bond length double length is longest (A) C H 3 - C H = C H 2 , α H = 3 (B) , α H = 0 (C) CH 2 = C = C H 2 , α H = 0 (D) , α H = 6