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a
A compound with delocalised electrons is more stable than the compound would be if all its `electrons were localised
b
Six π-electrons delocalised in benzene are referred to as the aromatic sextet
c
When a compound attains aromaticity, potential energy is decreased
d
When a compound attains aromaticity, potential energy is increased
answer is A.
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Detailed Solution
Antiaromatic compounds are planar, cyclic, conjugated systems with an even number of pairs of electrons. Such compounds satisfy the first three criteria for aromaticity. i.e. they are planar, cyclic with an uninterrupted ring of p orbital bearing atoms. But they have an even number of pairs of π electrons (4n, n = 1, 2, 3 etc). It should be noted that an aromatic compound is more stable compared to an analogous cyclic compound with localized electrons, where as an antiaromatic compound is less stable compared to an analogous cyclic compound with localized electrons (in 4n+2 systems delocalization increases the stability where as in 4n systems, delocalization decreases stability)