Hydrocarbons Question 286
Question: What is the chief product obtained when n-butane is treated with bromine in the presence of light at $ 130^{o}C $ [IIT-JEE 1995]
Options:
A) $ \underset{CH_3}{\mathop{\underset{|}{\mathop{CH_3-CH_2-CH-Br}}}} $
B) $ \underset{CH_3}{\mathop{\underset{|}{\mathop{CH_3-CH-CH_2-Br}}}} $
C) $ \underset{CH_3}{\mathop{\underset{|}{\mathop{\overset{CH_3}{\mathop{\overset{|}{\mathop{CH_3-C-Br}}}}}}}} $
D) $ CH_3-CH_2-CH_2-CH_2-Br $
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Answer:
Correct Answer: A
Solution:
$ CH_3-CH_2-CH_2-CH_3+Br_2\underset{130^{o}C}{\mathop{\xrightarrow{Light}}} $
$ \underset{\begin{smallmatrix} 2-Bromobutane\text{ } \\ \text{(Main}\text{product)} \end{smallmatrix}}{\mathop{CH_3-\underset{\underset{Br}{\mathop{|}}}{\mathop{CH}}-CH_2-CH_3}}+\underset{\begin{smallmatrix} 1-Bromobutane \\ \text{(Minor)} \end{smallmatrix}}{\mathop{CH_3-CH_2-CH_2-CH_2-Br}} $ 2-Bromobutane is the main product because $ 2^{o} $ carbonium ion is more stable than $ 1^{o} $ .
BETA
