A)
B) \[C{{H}_{3}}-CH=C{{H}_{2}}+HBr\to C{{H}_{3}}CHBrC{{H}_{3}}\]
C) \[C{{H}_{3}}-CH=CH-C{{H}_{3}}+HBr\xrightarrow[{}]{peroxide}\]\[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}Br\]
D) \[C{{H}_{3}}CH=C{{H}_{2}}+{{H}_{2}}\xrightarrow[{}]{catalysts}\]\[C{{H}_{3}}C{{H}_{2}}-C{{H}_{3}}\]
Correct Answer: B
Solution :
: The addition of hydrogen halides to alkenes takes place by a two step electrophilic mechanism. Step I which controls the overall rate of reaction involves the transfer of a proton to the alkene to form a carbocation. This is followed by step 2 in which the carbocation and the negative halide ion combine to form the final product.
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