MCQ
When an electron jumps from $L$ to $K$ shell
- AEnergy is absorbed
- ✓Energy is released
- CEnergy is sometimes absorbed and sometimes released
- DEnergy is neither absorbed nor released
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(IMAGE)
$[A]$ $I$ and $III$ follow $\mathrm{S}_{\mathrm{N}} 1$ mechanism
$[B]$ $I$ and $II$ follow $\mathrm{S}_{\mathrm{N}} 2$ mechanism
$[C]$ Compound $IV$ undergoes inversion of configuration
$[D]$ The order of reactivity for $I$, $III$ and $IV$ is: $IV$ $>$ $I$ $>$ $III$