Question

Which is more stable?

Short answer

a) 1^st compound is more stable.

b) 2^nd compound is more stable.

c) 2^nd compound is more stable.

Step-by-step solution

Reasons of stability

Among all the compounds, the stability of these alkenes is determined by the numbers of alpha H attached to the alpha carbon along the double bond. The more is the no of alpha H, the more is the stability of that alkene.

 Measurement of Stability

If we calculate the no of alpha H along the Double bond, we can identify the stability comparison between them.

So, between these two, the 1^st one is more stable.