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Question
Which out of the following is not aromatic compounds?
Which out of the following is not aromatic compounds?
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Solution
The correct option is A
In option(a), cyclobutadiene is cyclic, planar, 4π electron's system follows (4n) pi electrons rule. So it is anti-aromatic.
In option (b), the structure is cyclic, planar, 6 electrons system (4π−e+2−e from one of the lone pair of the O). It follows (4n+2) rule (n=2). 4π−e and 2−e from lone pair are in complete delocalisation or in resonance, hence aromatic.
In option (c), the structure naphthalene is cyclic, planar, 10π−e system, follows (4n+2) rule, hence aromatic.
In option (d), the structure pyridine is cyclic, planar, 6π−e system, follows (4n+2) rule, hence aromatic. Here the lone pair electrons does not participate in delocalisation/conjugation.
So, the correct answer is option(a).
In option(a), cyclobutadiene is cyclic, planar, 4π electron's system follows (4n) pi electrons rule. So it is anti-aromatic.
In option (b), the structure is cyclic, planar, 6 electrons system (4π−e+2−e from one of the lone pair of the O). It follows (4n+2) rule (n=2). 4π−e and 2−e from lone pair are in complete delocalisation or in resonance, hence aromatic.
In option (c), the structure naphthalene is cyclic, planar, 10π−e system, follows (4n+2) rule, hence aromatic.
In option (d), the structure pyridine is cyclic, planar, 6π−e system, follows (4n+2) rule, hence aromatic. Here the lone pair electrons does not participate in delocalisation/conjugation.
So, the correct answer is option(a).
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