Hydrocarbons Question 378

Question: At low temperatures, the slow addition of molecular bromine to $ CH_2=CH-CH_2-C\equiv CH $ gives [Roorkee Qualifying 1998]

Options:

A) $ CH_2=CH-CH_2-CBr=CHBr $

B) $ BrCH_2-CHBr-CH_2-C\equiv CH $

C) $ CH_2=CH-CH_2-CH_2-CBr_3 $

D) $ CH_3-CBr_2-CH_2-C\equiv CH $

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Answer:

Correct Answer: A

Solution:

$ CH_2=CH-CH_2-C\equiv CH+Br_2\to $

$ CH_2=CH-CH_2-\underset{\underset{Br}{\mathop{|}}}{\mathop{C=}}\underset{\underset{Br}{\mathop{|}}}{\mathop{CH}} $