A) \[CC{{l}_{3}}.CHO\]
B) \[C{{H}_{3}}-\underset{\underset{C{{H}_{3}}}{\mathop{|\,\,\,\,\,\,\,}}\,}{\mathop{\overset{\overset{C{{H}_{3}}}{\mathop{|\,\,\,\,\,\,\,}}\,}{\mathop{C\,\,-}}\,}}\,CHO\]
C) \[C{{H}_{3}}.C{{H}_{2}}.CHO\]
D) HCHO
Correct Answer: C
Solution :
\[\overset{\beta }{\mathop{C{{H}_{3}}}}\,-\overset{\alpha }{\mathop{C{{H}_{2}}}}\,-CHO\] aldehydes having \[\alpha -H\] atom can participate in aldol condensation. The \[H-\]atom attached to \[\alpha \] carbon atom are called \[\alpha \]-hydrogen.
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