Steric inhibition of resonance takes place in

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(C) Steric inhibition of resonance occurs when bulky groups are present at the ortho positions relative to a group involved in resonance (like $-N(CH_

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(C) Steric inhibition of resonance occurs when bulky groups are present at the ortho positions relative to a group involved in resonance (like $-N(CH_3)_2$).This forces the group out of the plane of the benzene ring,thereby inhibiting resonance.In option $C$,the presence of two methyl groups at the ortho positions relative to the $-N(CH_3)_2$ group causes steric hindrance,leading to the inhibition of resonance.

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