Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion Free radical halogenation of n-butane gives 72% 2-halobutane and 28% 1-halobutane. Reason A secondary hydrogen is abstracted more easily than the primary hydrogen.A) If both Assertion and Reason are true and Reason is the correct explanation of Assertion
B) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
C) If Assertion is true but Reason is false
D) If both Assertion and Reason are false
Correct Answer: A
Solution :
n-butane has six primary and four secondary hydrogens. Secondary hydrogen is abstracted more easily than the primary hydrogen, so free radical halogenation of n-butane gives 2-halobutane as major product, e.g., \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}C{{H}_{3}}\xrightarrow[hv]{C{{l}_{2}}}\underset{(minor,\,22%)}{\mathop{C{{H}_{2}}ClC{{H}_{2}}C{{H}_{2}}C{{H}_{3}}}}\,\] \[+C{{H}_{3}}-\underset{\begin{smallmatrix} \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,Cl \\ \,\,\,\,\,\,\,\,\,\,(major,78%) \end{smallmatrix}}{\mathop{\underset{|}{\mathop{CH}}\,}}\,-C{{H}_{2}}C{{H}_{3}}\]
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