RAJASTHAN PMT Rajasthan - PMT Solved Paper-2002

  • question_answer
    Which of the following gives most stable carbocation by dehydration?

    A)  \[{{(C{{H}_{3}})}_{2}}CH-OH\]

    B)  \[{{(C{{H}_{3}})}_{2}}C-OH\]

    C)  \[C{{H}_{3}}-C{{H}_{3}}-OH\]

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

    Correct Answer: B

    Solution :

    The stability of carbonium ion follows the order  \[{{3}^{o}}>{{2}^{o}}>{{1}^{o}}\] Tertiary alcohol gives tertiary butyl carbonium ion on dehydration.                 \[{{(C{{H}_{3}})}_{3}}C-OH\xrightarrow{{}}{{(C{{H}_{3}})}_{3}}{{C}^{+}}+O{{H}^{-}}\]


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