A) \[{{C}_{6}}{{H}_{5}}CO{{C}_{6}}{{H}_{5}}\]
B) \[{{C}_{6}}{{H}_{5}}COCH=C{{H}_{2}}\]
C) \[~{{C}_{6}}{{H}_{5}}COC{{H}_{2}}COC{{H}_{3}}\]
D) \[~C{{H}_{3}}COC{{H}_{2}}COC{{H}_{3}}\]
Correct Answer: A
Solution :
\[{{\text{C}}_{\text{6}}}{{\text{H}}_{\text{5}}}\text{CO}{{\text{C}}_{\text{6}}}{{\text{H}}_{\text{5}}}\]does not exhibit tautomerism as it contains no \[\alpha -H\]atom.
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