# The IUPAC name of the following compound

(a) 4- bromo - 3 - cyanophenol

(b) 2 - bromo - 3 - hydroxybenonitrile

(c) 2 - cyano - 4 - hydroxybromobenzene

(d) 6 - bromo - 3 - hydroxybenonitrile

Since $-CN$ has the highest priority .
Hence the parent compound is a nitrile.