MCQ
The major product obtained in the photobromination of $2-$ methyl butane is
- ✓$2-$ bromo $-2-$ methylbutane
- B$1-$ bromo $-2-$ methylbutane
- C$1-$ bromo $-3-$ methylbutane
- D$2-$ bromo $-3-$ methylbutane
✓
Answer
Correct option: A.
$2-$ bromo $-2-$ methylbutane
a
$\begin{matrix}
\,\,\,\,C{{H}_{3}} \\
| \\
C{{H}_{3}}-C-C{{H}_{2}} \\
| \\
H \\
\end{matrix}$ $\xrightarrow[B{{r}_{2}}]{hv}$ $\underset{\begin{smallmatrix}
2-bromo-2-methyl\,bu\tan e \\
(major\,product)
\end{smallmatrix}}{\mathop{\begin{align}
\begin{matrix}
\,\,\,\,C{{H}_{3}} \\
| \\
C{{H}_{3}}-C-C{{H}_{2}} \\
| \\
H \\
\end{matrix}\xrightarrow[B{{r}_{2}}]{hv} \\
\begin{matrix}
C{{H}_{3}}\,\,\,\,\,\,\,\,\, \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
C{{H}_{3}}-C-C{{H}_{2}}-C{{H}_{3}} \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
Br\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
\end{matrix} \\
\end{align}}}\,$
$\begin{matrix}
\,\,\,\,C{{H}_{3}} \\
| \\
C{{H}_{3}}-C-C{{H}_{2}} \\
| \\
H \\
\end{matrix}$ $\xrightarrow[B{{r}_{2}}]{hv}$ $\underset{\begin{smallmatrix}
2-bromo-2-methyl\,bu\tan e \\
(major\,product)
\end{smallmatrix}}{\mathop{\begin{align}
\begin{matrix}
\,\,\,\,C{{H}_{3}} \\
| \\
C{{H}_{3}}-C-C{{H}_{2}} \\
| \\
H \\
\end{matrix}\xrightarrow[B{{r}_{2}}]{hv} \\
\begin{matrix}
C{{H}_{3}}\,\,\,\,\,\,\,\,\, \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
C{{H}_{3}}-C-C{{H}_{2}}-C{{H}_{3}} \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
Br\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
\end{matrix} \\
\end{align}}}\,$
The reactivity of different types of hydrogen follows the order: benzylic $\approx $ allylic $>$ tertiary $>$ secondary $>$ primary $>$ vinylic $\approx $ aryl.
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