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Manipal MET2017ChemistryGeneral Organic Chemistry

Which of the following is most acidic?

Correct answer

2

Step-by-step solution

The phenoxide ion left from o-hydroxybenzaldehyde and p -hydroxybenzaldehyde are stabilized by -I and -R effect of the - CHO group. But in 0 -isomer due to chelation it is difficult to remove the H -atom. Hence, p -hydroxybenzaldehyde is the strongest acid.

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