- AAddition
- ✓Substitution
- CDehydrohalogenation
- DElimination
$\underset{Alkyhalide}{\mathop{R-\,C{{H}_{2}}-C{{H}_{2}}-X}}\,\xrightarrow[Alc.KOH]{Dehydroha\log enation}$ $\underset{Alkene}{\mathop{R-\,CH=C{{H}_{2}}+HX}}$
$\underset{Alkyhalide}{\mathop{R-\,C{{H}_{2}}-C{{H}_{2}}-X}}\,\xrightarrow[Alc.KOH]{E\lim ination}$ $\underset{Alkene}{\mathop{R-\,CH=C{{H}_{2}}+HX}}$
$\underset{Alkyhalide}{\mathop{R-\,C{{H}_{2}}-C{{H}_{2}}-X}}\,\xrightarrow[substitution]{Aq.\,KOH}$ $\underset{Alcohol}{\mathop{R-\,C{{H}_{2}}-C{{H}_{2}}-OH+HX}}\,$
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(Given atomic number $\mathrm{Sc}: 21, \mathrm{Ti}: 22, \mathrm{~V}: 23, \mathrm{Cr}$ : $24, \mathrm{Mn}: 25, \mathrm{Fe}: 26)$

Reason : Addition of non-volatile solute into solvent results into depression of freezing point of the solvent.
