A) propene
B) 1-butene
C) but-2-ene
D) pent-2-ene
Correct Answer: C
Solution :
Anti-Markownikoffs rule is not applicable in case of symmetrical alkenes. The structures of the given compounds are \[\underset{propene}{\mathop{C{{H}_{3}}CH=C{{H}_{2}}}}\,\] \[\underset{1-butene}{\mathop{C{{H}_{3}}C{{H}_{2}}CH=C{{H}_{2}}}}\,\] \[\underset{\begin{smallmatrix} \,\,\,\,\,\,but\,\,2-ene \\ (symmetrical) \end{smallmatrix}}{\mathop{C{{H}_{3}}CH=CHC{{H}_{3}}}}\,\] \[\underset{pent-2-ene}{\mathop{C{{H}_{3}}C{{H}_{2}}CH=CHC{{H}_{3}}}}\,\] Thus, anti-Markownikoff?s rule is not applicable to but-2-ene.
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