A) Propene \[+HC1\text{ }\to \text{ }2-\] chloropropane
B) Propene \[+HBr\xrightarrow{peroxide}\]
C) 1-bromopropane Propene \[+HCl\xrightarrow{peroxide}\] 2-chloropropane
D) Propene \[+HBr\to \]1-bromopropane
Correct Answer: D
Solution :
\[\underset{propene}{\mathop{C{{H}_{3}}CH=C{{H}_{2}}}}\,+HBr\xrightarrow[rule]{Markownikoffs)}\] \[C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ Br \\ 2-bromopropane \end{smallmatrix}}{\mathop{CH-C{{H}_{3}}}}\,\] \[\underset{propene}{\mathop{C{{H}_{3}}CH=C{{H}_{2}}}}\,+HBr\xrightarrow[\begin{smallmatrix} Anti-Markownikoffs \\ rule \end{smallmatrix}]{Peroxide}\] \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}Br\] 1-bromopropane Peroxide effect is possible only in the presence of HBr. This effect is not possible in the presence of HC1 and HI. \[\underset{propene}{\mathop{C{{H}_{3}}CH=C{{H}_{2}}}}\,+HCl\xrightarrow{peroxide}\] \[C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ Cl \\ 2-chloropropane \end{smallmatrix}}{\mathop{CH-C{{H}_{3}}}}\,\]
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