MCQ
Alkyl halide can be converted into alkene by
- ANucleophilic substitution reaction
- ✓Elimination reaction
- CBoth nucleophilic substitution and elimination reaction
- DRearrangement
$R-C{{H}_{2}}-C{{H}_{2}}-X\xrightarrow{\text{dehydro halogenation}}R-CH=C{{H}_{2}}$
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The correct order of $S_N1$ reactivity is

(Given : Atomic masses: $C$ : $12.0\, u$, $H : 1.0\, u , N : 14.0\, u , Br : 80.0\, u ]$