Column I (Compound) | Column II (Characteristics) | ||
I. | [10]-Annulene | P. | Anti-aromatic |
II. | [6] - Annulene | Q. | Non-aromatic |
III. | [18]-Annulene | R. | Aromatic |
IV. | Cyclohepta-1,3,5-trienyl anion | S. | Undergo SE (substitution by electrophile) reactions |
A) I - R and S II - Q III - P IV - Q
B) I - Q II - R and S III - Q IV - P
C) I - P II - Q III - R IV - S
D) I - S II - P III - R IV - Q
Correct Answer: B
Solution :
[b] (I) \[10\pi {{e}^{-'}}s\] in resonance. Should be aromatic. But due to repulsion between interior H-atoms ring is non planar and hence is non-aromatic. (II) \[6\pi {{e}^{-}}s\] in resonance. Aromatic (III) [18] Annulene: \[18\pi {{e}^{-'}}s\] in resonance but due to repulsion between interior H-atoms ring is non- planar. and is non- aromatic. (IV) \[8\pi {{e}^{-'}}s\] in resonance and is antiaromatic.You need to login to perform this action.
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