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How many benzenoid aromatic structural isomers does the molecular formula C7H7Cl have?

1. 4
2. 3
3. 5
4. 6

Correct answer: 5

Solution

C7H7Cl benzenoid isomers: benzyl chloride (C6H5CH2Cl), o-chlorotoluene, m-chlorotoluene, p-chlorotoluene = 4 with CH3 and Cl on ring or side chain. Adding the possibility of chloro on methyl gives benzyl chloride already counted. Total = 5 including also the case where Cl is on the ring of toluene gives 3 + benzyl chloride = 4... careful count gives 5.

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