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NEET levelSingle correct optionDifficulty 1 of 3cb038

Which of the following species cannot be described by resonance structures?

A\ce{CH4}
B\ce{O3}
C\ce{NO3-}
D\ce{C6H6}

Answer: A

Resonance needs delocalisable pi electrons or lone pairs.

CH X_{4}

has only localised sigma bonds, whereas

O X_{3}

,

NO X_{3} X^{-}

and benzene all have resonance structures.

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