MCQ
The $IUPAC$ name of the following compound is
- A$4-$ Bromo $-3-$ cyanophenol
- ✓$2-$ Bromo $-5-$ hydroxy benzonitrile
- C$2-$ Cyano $-4-$ hydroxy bromobenzene
- D$6-$ Bromo $-3-$ hydroxy benzonitrile
✓
Answer
Correct option: B.
$2-$ Bromo $-5-$ hydroxy benzonitrile
b
In this compound, the first priority is given to the $- CN$ functional group. So, the numbering will start from carbon attached to $- CN$ group.
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 $2^{\text {nd }}$ position and $- OH$ will be at the $5^{\text {th }}$ position.
So, the name is $2$-bromo-$5$-hydroxybenzonitrile.
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