What is the degree of unsaturation of the compound shown? Use the formula (2C + 2 + N - H - X)/2, where X is the number of halogen atoms.

Answer: B

The compound is 4-amino-3-chlorobenzoic acid, C7H6ClNO2. Degree of unsaturation = (2 x 7 + 2 + 1 - 6 - 1)/2 = 5, which equals the benzene ring (4) plus the C=O (1).

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