JEE Main & Advanced Sample Paper JEE Main Sample Paper-36

  • question_answer
    Among the reactions given below for \[{{B}_{2}}{{H}_{6}},\] the one which does not take place is

    A)  \[{{B}_{2}}{{H}_{6}}+HCl\xrightarrow{{}}{{B}_{2}}{{H}_{5}}Cl+{{H}_{2}}\]

    B)  \[2{{B}_{2}}{{H}_{6}}+6N{{H}_{3}}\xrightarrow{\Delta }{{B}_{3}}{{N}_{3}}{{H}_{6}}\,\,(borazine)\]

    C)  \[{{B}_{2}}{{H}_{6}}+2N{{(C{{H}_{3}})}_{3}}\xrightarrow{{}}2{{(C{{H}_{3}})}_{3}}NB{{H}_{3}}\]

    D)  \[{{B}_{2}}{{H}_{6}}+6{{C}_{2}}{{H}_{4}}\xrightarrow{{{H}_{3}}{{O}^{+}}}3{{C}_{2}}{{H}_{5}}OH+2B{{(OH)}_{3}}\]

    Correct Answer: D

    Solution :

     Reaction between diborane and alkene are carried out in dry ether under an atmosphere of \[{{N}_{2}}\] because \[{{B}_{2}}{{H}_{6}}\]and the products are very reactive. The products farther treated with alkaline \[{{H}_{2}}{{O}_{2}}\]to convert into alcohols. \[{{B}_{2}}{{H}_{6}}+6{{C}_{2}}{{H}_{4}}\xrightarrow{{}}\underset{reactive}{\mathop{B{{({{C}_{2}}{{H}_{4}})}_{3}}}}\,\xrightarrow[{{H}_{2}}{{O}_{2}}]{alkaline}\]\[3C{{H}_{3}}C{{H}_{2}}OH+{{H}_{3}}B{{O}_{3}}\]


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