A) compound containing an aldehyde and a ketonic group
B) \[\alpha ,\beta \]-unsaturated acid
C) \[\alpha \]-hydroxy aldehyde
D) \[\alpha \]-hydroxy ketone
Correct Answer: D
Solution :
Benzaldehyde when heated with ethanolic \[KCN\], it gives a-hydroxy ketone, benzoin. \[\underset{Benzaldehyde\,(2mol)}{\mathop{{{C}_{6}}{{H}_{5}}CHO+H-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-{{C}_{6}}{{H}_{5}}\xrightarrow[\Delta ]{alcKCN}}}\,\] \[\underset{Benzoin}{\mathop{{{C}_{6}}{{H}_{5}}CH(OH)\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-{{C}_{6}}{{H}_{5}}}}\,\]
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