JEE Main & Advanced Chemistry Haloalkanes and Haloarenes Question Bank Critical Thinking Haloalkanes

  • question_answer Among the following the most reactive towards alcoholic KOH is [AIIMS 2004]

    A) \[C{{H}_{2}}=CHBr\]

    B) \[C{{H}_{3}}COC{{H}_{2}}C{{H}_{2}}Br\]

    C) \[C{{H}_{3}}C{{H}_{2}}Br\]

    D) \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}Br\]

    Correct Answer: D

    Solution :

      The polarity between C-X bond increase by increasing the +I effect which increase by increasing the alkyl group by which X of C-X easily eliminate. In \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}Br\] the polarity is maximum due to 3 alkyl group while in rest polarity decrease due to the presence of double bond, presence of -CO group (-I) and less no. of alkyl group. \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}Br+KOH\xrightarrow{\text{alc}\text{.}}\]\[C{{H}_{3}}CH=C{{H}_{2}}+KBr+{{H}_{2}}O\]


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