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NEET Chemistry Alcohols, Phenols and Ethers / एल्कोहॉल, फीनॉल तथा ईथर Question Bank Self Evaluation Test - Alcohols, Phenols and Ethers

  • question_answer
    What is the product of the following sequence of reactions? \[{{\left( C{{H}_{3}} \right)}_{2}}C=CH.C{{H}_{2}}C{{H}_{3}}~\xrightarrow[(ii)\,{{H}_{2}}{{O}_{2}},O{{H}^{-}}]{\left( i \right)B{{H}_{3}}/THF}\] \[\xrightarrow[C{{H}_{2}}C{{l}_{2}}]{PCC}\,\,\xrightarrow[(ii)\,{{H}_{3}}{{O}^{+}}]{(i)\,C{{H}_{3}}MgBr}\]

    A) 2, 4- dimethyl - 3 - pentanol

    B) 2, 3- dimethyl - 3 - pentanol

    C) 2, 3 - dimethyl - 2 - pentanol

    D) 2, 2- dimethyl - 3 - pentanol

    Correct Answer: B

    Solution :

    [b] \[{{(C{{H}_{3}})}_{2}}C=CH.C{{H}_{2}}C{{H}_{3}}\xrightarrow[{{H}_{2}}{{O}_{2}}.O{{H}^{-}}]{B{{H}_{3}}/THF}\] \[{{(C{{H}_{3}})}_{2}}CH-\underset{OH}{\mathop{\underset{|}{\mathop{C}}\,}}\,H-C{{H}_{2}}C{{H}_{3}}\xrightarrow{[O]}\] \[{{(C{{H}_{3}})}_{2}}CH-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-C{{H}_{2}}-C{{H}_{3}}\xrightarrow[{{H}_{3}}{{O}^{-}}]{C{{H}_{3}}Mgbr}\] \[(\underset{2,\,3-Dimethyl-3-\text{pentanol}}{\mathop{C{{H}_{3}}{{)}_{2}}CH-\underset{C{{H}_{3}}}{\mathop{\overset{OH}{\mathop{\underset{|}{\mathop{\overset{|}{\mathop{C}}\,}}\,}}\,}}\,-C{{H}_{2}}-C{{H}_{3}}}}\,\]


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