Question

Why `D_2O` is hydrophobic in nature?

Answer 1

`D_2O` is NOT a hydrophobe.

Explanation:

`D_2O`, i.e. `""^2H_2O`, is an isotopomer of water. Water and heavy water would be infinitely miscible. Certainly, if you are a big enough pratt to leave your bottle of heavy water open, it will exchange protons with atmospheric water.