A) glycerol
B) benzene
C) phenol
D) ammonia
Correct Answer: A
Solution :
Glycerol when heated with \[KHS{{O}_{4}}\] or \[ZnC{{l}_{2}}\] \[\text{or}\] conc.\[{{H}_{2}}S{{O}_{4}}\], undergoes dehydration to form acrolein. \[\underset{\begin{smallmatrix} | \\ C{{H}_{2}}OH \\ glycerol \end{smallmatrix}}{\overset{\begin{smallmatrix} C{{H}_{2}}OH \\ | \end{smallmatrix}}{\mathop{C}}}\,HOH\xrightarrow[-2{{H}_{2}}O]{KHS{{O}_{4}},\,\,\Delta }\left[ \underset{\begin{smallmatrix} |\,\,| \\ CHOH \end{smallmatrix}}{\overset{\begin{smallmatrix} C{{H}_{2}} \\ |\,\,| \end{smallmatrix}}{\mathop{C}}}\, \right]\xrightarrow{Tautomerises}\underset{\begin{align} & |\,\,| \\ & CHO \\ & acrolein \\ & or \\ & prop-2en-1-al \\ \end{align}}{\overset{\begin{smallmatrix} C{{H}_{2}} \\ |\,\,| \end{smallmatrix}}{\mathop{CH}}}\,\]
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