Question
Which of the following will give 2, 2-dibromopropane on reaction with $$HBr?$$
A.
$$C{H_3} - CH = C{H_2}$$
B.
$$C{H_3}C \equiv CH$$
C.
$$C{H_3}CH = CHBr$$
D.
$$CH \equiv CH$$
Answer :
$$C{H_3}C \equiv CH$$
Solution :
\[C{{H}_{3}}C\equiv CH\xrightarrow{HBr}C{{H}_{3}}-\underset{\begin{smallmatrix}
| \\
Br
\end{smallmatrix}}{\mathop{C}}\,\] \[=C{{H}_{2}}\xrightarrow{HBr}\] \[\underset{\text{2, 2-Dibromopropa}}{\mathop{C{{H}_{3}}\underset{\begin{smallmatrix}
| \\
\,Br
\end{smallmatrix}}{\overset{\begin{smallmatrix}
\,\,Br \\
|
\end{smallmatrix}}{\mathop{-C-}}}\,C{{H}_{3}}}}\,\]