MCQ
Propene when heated with chlorine at about $500\,^oC$ forms
- ✓$CH_2Cl -CH = CH_2$
- B$CH_3 -CHCl -CH_2Cl$
- C$CH_2Cl-CHCl-CH_2Cl$
- DAll of these
✓
Answer
Correct option: A.
$CH_2Cl -CH = CH_2$
a
$C{{H}_{3}}-CH=C{{H}_{2}}+C{{l}_{2}}$ $\xrightarrow{500{{\,}^{o}}C}$ $\begin{matrix}
C{{H}_{2}}-CH=C{{H}_{2}}+HCl \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
Cl\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
\end{matrix}$
$C{{H}_{3}}-CH=C{{H}_{2}}+C{{l}_{2}}$ $\xrightarrow{500{{\,}^{o}}C}$ $\begin{matrix}
C{{H}_{2}}-CH=C{{H}_{2}}+HCl \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
Cl\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
\end{matrix}$
This reaction is called allylic halogenation reaction becaus halogenation occurs at the allylic position of an alkene
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