MCQ
Number of benzene derivatives of $C_7H_7Cl$ is :
- A$2$
- ✓$4$
- C$5$
- D$6$
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| Element | $IE_1$ | $IE_2$ | $IE_3$ |
| $P$ | $495.8$ | $4562$ | $6910$ |
| $Q$ | $737.7$ | $1451$ | $7733$ |
| $R$ | $577.5$ | $1817$ | $2745$ |
Then incorrect option is