JEE Main & Advanced Chemistry Alcohols, Phenols and Ethers / एल्कोहॉल, फीनॉल तथा ईथर Question Bank Properties of alcohol Phenol and Ethers

  • question_answer
    When glycerol is heated with \[KHS{{O}_{4}}\] it gives [CPMT 1974, 85; MP PMT 1988, 90, 91, 92, 94; MP PET 1988, 92]

    A)                 \[C{{H}_{2}}=CH-C{{H}_{3}}\]    

    B)                 \[C{{H}_{2}}=CH-C{{H}_{2}}OH\]

    C)                 \[C{{H}_{2}}=CH-CHO\]

    D)                 \[C{{H}_{2}}=C=C{{H}_{2}}\]

    Correct Answer: C

    Solution :

               \[\underset{\text{Glycerol}}{\mathop{\underset{\,\underset{\,\,\,\,\,\,OH}{\mathop{\,\,H-\underset{|}{\mathop{C}}\,-H}}\,}{\overset{\,\,\,\,\,\,H-\overset{H}{\mathop{\overset{|}{\mathop{C}}\,}}\,-OH}{\mathop{HO-\underset{|}{\overset{|}{\mathop{C}}}\,-H}}}\,}}\,\xrightarrow{KHS{{O}_{4}}}\underset{\text{Unstable}}{\mathop{\overset{\overset{H-\overset{\overset{H}{\mathop{|}}\,}{\mathop{C}}\,\,\,\,\,\,\,\,\,}{\mathop{||\,}}\,\,\,\,\,\,\,}{\mathop{\underset{\underset{\underset{OH\,\,\,}{\mathop{\,\,\underset{|}{\mathop{C}}\,-H}}\,}{\mathop{||\,\,\,\,\,\,\,}}\,}{\mathop{C\,\,\,\,\,}}\,}}\,}}\,\xrightarrow{{}}\]          \[\overset{\overset{H-\overset{\overset{H}{\mathop{|}}\,}{\mathop{C}}\,\,\,\,\,\,\,\,\,}{\mathop{||\,}}\,\,\,\,\,\,\,}{\mathop{\underset{\underset{\underset{\,\underset{O}{\mathop{||}}\,}{\mathop{\,C}}\,-H}{\mathop{||\,\,\,\,\,\,\,}}\,}{\mathop{\,\,\,C-H}}\,}}\,\]or \[\underset{\text{Acrolein}}{\mathop{\underset{\underset{CHO}{\mathop{|\,\,\,\,\,\,\,\,}}\,}{\overset{\overset{\,\,C{{H}_{2}}}{\mathop{||\,\,\,\,\,\,}}\,}{\mathop{CH\,}}}\,}}\,\]


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