Question

Is there hydrogen bonding in D2O(heavy water)?

Answer 1

Yes Ofcourse.
But the Strength of hydrogen bond with protium and Deuterium are not the same.
Strength of Hydrgen bond is directly proportional to The number of moles per ml (At a given temperature)
The number of moles per mL of D2O is 0.0553, but the number of moles per mL of H2O at the same temperature (4° C) is 0.0555.
So the hydrogen bonds are little stronger in “normal” water.
And this despite the O-D bond length being slightly shorter than the O-H bond length, the molecule “should be” much smaller, so the number of molecules per mL should have been higher.