(A) $1$. Bithionol: It contains two $-OH$ groups attached to the two benzene rings.$2$. Terpineol: It contains one $-OH$ group in its structure.$3$. C

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(A) $1$. Bithionol: It contains two $-OH$ groups attached to the two benzene rings.$2$. Terpineol: It contains one $-OH$ group in its structure.$3$. Chloroxylenol: It contains one $-OH$ group attached to the benzene ring.Therefore,the number of $-OH$ groups in bithionol,terpineol,and chloroxylenol is $2, 1, 1$ respectively.