MCQ
Which of the following reactions will yield $2, 2-$ dibromopropane?
- A$CH_3-CH = CH_2 + HBr \rightarrow$
- ✓$CH_3-C \equiv CH+2HBr \rightarrow$
- C$CH_3CH= CHBr+HBr \rightarrow$
- D$CH\equiv CH+2HBr \rightarrow$
✓
Answer
Correct option: B.
$CH_3-C \equiv CH+2HBr \rightarrow$
b
$HC\equiv CH\xrightarrow{HBr}\begin{matrix}
H-C=C{{H}_{2}} \\
\,\,|\,\,\,\,\,\,\,\, \\
Br\,\,\,\, \\
\end{matrix}\xrightarrow{HBr}\underset{1,1-dibromoethene}{\mathop{\begin{matrix}
Br\,\,\, \\
|\,\,\,\,\, \\
H-C-C{{H}_{3}} \\
|\,\,\,\, \\
Br\,\, \\
\end{matrix}}}\,$
$HC\equiv CH\xrightarrow{HBr}\begin{matrix}
H-C=C{{H}_{2}} \\
\,\,|\,\,\,\,\,\,\,\, \\
Br\,\,\,\, \\
\end{matrix}\xrightarrow{HBr}\underset{1,1-dibromoethene}{\mathop{\begin{matrix}
Br\,\,\, \\
|\,\,\,\,\, \\
H-C-C{{H}_{3}} \\
|\,\,\,\, \\
Br\,\, \\
\end{matrix}}}\,$
$C{{H}_{3}}-CH=C{{H}_{2}}\xrightarrow{HBr}\underset{2-bromopropane}{\mathop{\begin{matrix}
C{{H}_{3}}-CH-C{{H}_{3}} \\
|\,\,\,\, \\
Br\, \\
\end{matrix}}}\,$
$C{{H}_{3}}-C\equiv CH\xrightarrow{HBr}\begin{matrix}
C{{H}_{3}}-C=C{{H}_{2}} \\
| \\
Br \\
\end{matrix}$ $\xrightarrow{{HBr}}\mathop {\begin{array}{*{20}{c}}
{\,Br} \\
| \\
{C{H_3} - C - C{H_3}} \\
| \\
{\,Br}
\end{array}}\limits_{2,2 - dibromopropane} $
$C{H_3}CH = CHBr\xrightarrow{{HBr}}\mathop {\begin{array}{*{20}{c}}
{C{H_3} - CH - C{H_2}Br} \\
{|\,\,\,\,\,\,\,\,\,\,} \\
{\,Br\,\,\,\,\,\,\,\,\,}
\end{array}}\limits_{1,2 - dibromopropane} $
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