MCQ
Arrange the following carbocation in increasing order of stability


- A$I < II < III < IV$
- B$IV < III < II < I$
- ✓$IV < II < III < I$
- D$I < II < IV < III$

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${C_2}{H_{4(g)}} + {H_{2(g)}} \rightleftharpoons {C_2}{H_{6(g)}}\,;$
$\Delta H = -32.7\,Kcal$ carried out is a vessel, the equilibrium concentration of $C_2H_4$ can be increased by
Reason : Addition of $HBr$ on $2-$ butene follows Markovnikov rule.