Question

Arrange the following in increasing order of stability.

• A. I $<$ II $<$ III
• B. II $<$ I $<$ III
• C. I $<$ III $<$ II
• D. II $<$ III $<$ I

Answer 1

The correct option is B II $<$ I $<$ III

Stability order is $III>I>II$

$III$ is neutral so most stable alkene.

In $I$ and $II$ after resonance, it gives more stable resonating structure.

So, the order is $III>I>II$