Ncert Exercises & Solutions

The structure of triphenylmethyl cation is given below. This is very stable and some of its salts can be stored for months. Explain the cause.

In tryphenylmethyl cation, due to resonance, the positive charge can move at both the o- and p-position of each benzene ring. This is illustrated below

Since, there are three benzene rings, hence, there are, in all, nine resonance structures. Thus, triphenylmethyl cation is highly stable due to these nine resonance structures.

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