A) \[\beta \]-hydroxybutyraldehyde
B) \[\alpha \]-hydroxybutanal
C) \[\beta \]-hydroxypropanal
D) None. of the above
Correct Answer: A
Solution :
Aldol is p-hydroxybutyraldehyde (or 3-hydroxybutanal) ie, \[\overset{OH}{\mathop{\overset{|}{\mathop{C{{H}_{3}}-CH-C{{H}_{2}}CHO}}\,}}\,\] Note: \[\beta \]-hydroxypropaiw \[\left( \underset{OH}{\mathop{\underset{|}{\mathop{\underset{|}{\mathop{C{{H}_{2}}C{{H}_{2}}CHO}}\,}}\,}}\, \right)\]is not considered as aldol.
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