| Read the assertion and reason carefully to mark the correct option out of the options given below: |
| Assertion: 1-Butene on reaction with \[HBr\] in the presence of a peroxide produces 1-bromo-butane. |
| Reason: It involves the free radical mechanism. [IIT-JEE (Screening) 2000] |
A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Correct Answer: A
Solution :
[a] This reaction is followed by against of Markownikoff rule \[\underset{\text{1 Butene}}{\mathop{H-\underset{H}{\overset{H}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,-\underset{H}{\overset{H}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,-\overset{H}{\mathop{\overset{|}{\mathop{C}}\,}}\,=\underset{H}{\overset{H}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,}}\,\,\,\,\,+\,\,HBr\xrightarrow{\text{Peroxide}}\]\[\underset{\text{1 Bromo butane}}{\mathop{H-\underset{H}{\overset{H}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,-\underset{H}{\overset{H}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,-\underset{H}{\overset{H}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,-\underset{Br}{\overset{H}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,\,}}}\,}}\,\] In this reaction anti Markownikoff?s addition is explained on the basis of the fact that in the presence of peroxide the addition takes place Via a free radical mechanism rather than the ionic mechanism.
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