MCQ
Among the following the aromatic compound is
- ✓
- B
- C
- D
✓
Answer
Correct option: A.
a
$(a)$ According to Huckel rule for aromaticity the molecule must be planar, cyclic system having delocalised $(4n + 2) \,\pi$ electron where $n$ is an integer equal to $0, 1, 2, 3,$ thus the aromatic comp. have delocalised electron cloud of
$2, 6, 10$ or $14$ $\pi$ electron cyclopropenyl cation have the $2$ $\pi$ electron $(n = 0)$ so it is aromatic.
$(a)$ According to Huckel rule for aromaticity the molecule must be planar, cyclic system having delocalised $(4n + 2) \,\pi$ electron where $n$ is an integer equal to $0, 1, 2, 3,$ thus the aromatic comp. have delocalised electron cloud of
$2, 6, 10$ or $14$ $\pi$ electron cyclopropenyl cation have the $2$ $\pi$ electron $(n = 0)$ so it is aromatic.
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→{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_3}} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|} \\
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{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_3}\,\,\,\,\,\,\,\,\,C{H_2}C{H_2}C{H_3}\,\,\,}
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