The molecular formula of diphenyl methane is . How many unique structural isomers are possible when exactly one of the hydrogen atoms is replaced by a chlorine atom?

Question

The molecular formula of diphenyl methane is $C_{13}H_{12}$. How many unique structural isomers are possible when exactly one of the hydrogen atoms is replaced by a chlorine atom?

Prashant Kotian · Accepted Answer

Correct answer: 4. Due to the symmetry of the diphenylmethane molecule, monochlorination can yield unique products at exactly four distinct environments: (1) the central methylene bridge, (2) the ortho positions of the rings, (3) the meta positions of the rings, and (4) the para positions of the rings. Thus, 4 isomers are possible.

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