Question

In which pair second ion is more stable than first?

• A. (i) and (ii)
• B. (ii) and (iii)
• C. (ii) and (iv)
• D. (iii) and (iv)

Answer 1

Answer: (B)

(ii) and (iii)

In option (ii), the second structure is aromatic thus it will be more stable than the first structure. Similarly, in option (iii), the second structure is aromatic. Thus it is more stable than the first structure.

While in option i and iv the second compound is less stable as in i the second compound is antiaromatic .

Thus, the correct answer is (ii) and (iii).