Question

The IUPAC name of the compound shown above is:

• A. 4-bromo-3-cyanophenol
• B. 2-bromo-5-hydroxybenzonitrile
• C. 2-cyano-4-hydroxybromobenzene
• D. 6-bromo-3-hydroxybenzonitrile

Answer 1

The correct option is B 2-bromo-5-hydroxybenzonitrile

In this compound, the first priority is given to the $-CN$ functional group. So, the numbering will start from carbon attached to $-CN$ group.
Now, the lowest set of locant rule is considered.
Number 1 is given to $-CN$ group, $-Br$ will be at the $2^{nd}$ position and $-OH$ will be at the $5^{th}$ position.
So, the name is 2-bromo-5-hydroxybenzonitrile.