MCQ
Which one of the following elements has the highest ionisation energy
- A$[Ne]\,3{s^2}\,3{p^1}$
- B$[Ne]\,3{s^2}\,3{p^2}$
- ✓$[Ne]\,3{s^2}\,3{p^3}$
- D$[Ar]\,3{d^{10}}\,4{s^2}\,4{p^2}$
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when attached to $sp^3$ hybridised carbon, their leaving group ability in nucleophilic substitution reaction decrease in the order.

| $1$ | $2$ | $3$ | |
| $\mathrm{HI}\left(\mathrm{mol} \mathrm{L}^{-1}\right)$ | $0.005$ | $0.01$ | $0.02$ |
| Rate $\left(\mathrm{mol} \mathrm{L}^{-1} \mathrm{~s}-1\right)$ | $7.5 \times 10^{-4}$ | $3.0 \times 10^{-3}$ | $1.2 \times 10^{-2}$ |