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How many species have unpaired electrons?

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Important Questions on Chemical Bonding
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Decreasing order of stability of and is:

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(i)
(ii)
(iii)
Among the following, sigma bond alone is present in -

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Assertion: In the bonding molecular orbital (MO) of electron density is increased between the nuclei.
Reason: The bonding MO is , which shows destructive interference of the combining electron waves.

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