A)
B)
C)
D)
Correct Answer: C
Solution :
The phenoxide ion left from o-hydroxybenzaldehyde and p-hydroxybenzaldehyde are stabilized by -1 and \[-R\]effect of the\[-CHO\]group. But in o-isomer due to chelation it is difficult to remove the H-atom. Hence, p-hydroxybenzaldehyde is the strongest acid.
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