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Question:

Arrange the following in the order of increasing value of the equilibrium constant for hydration, Khyd (smallest value first).

2<3<1

2<1<3

3<1<2

1<2<3

Solution:

As the polarity of C=O bond decreases hydration decreases. In compound 3 polarity is least due to +I effect of tert-butyl. Compound 2 is most polar among the given compounds as +I effect will be less in 2 compared to 1. So the order would be 3<1<2