A) \[C{{H}_{2}}=CH-CHO\]
B) \[CH=C-CHO\]
C) \[{{C}_{6}}{{H}_{5}}CHO\]
D) \[C{{H}_{3}}C{{H}_{2}}CHO.\]
Correct Answer: D
Solution :
[d] Aldehydes which contain a a -hydrogen on a saturated carbon, i.e., \[C{{H}_{3}}C{{H}_{2}}CHO\] undergo aldol condensation. \[\underset{propanal}{\mathop{C{{H}_{3}}C{{H}_{2}}}}\,-\overset{H}{\mathop{\overset{|}{\mathop{C}}\,}}\,=O+H-H\underset{\alpha }{\mathop{\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{C}}\,}}\,}}\,-CHO\] \[\xrightarrow{O{{H}^{-}}}\underset{\text{3-Hydroxy-2,}\,\,\text{3-dimehtyl}\,\,\text{pentanal}}{\mathop{\,C{{H}_{3}}C{{H}_{2}}-\overset{C{{H}_{3}}}{\mathop{\underset{OH}{\mathop{\underset{|}{\mathop{\overset{|}{\mathop{{}^{\beta }C}}\,}}\,}}\,}}\,-\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{{}^{\alpha }C}}\,}}\,HCHO}}\,\]
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