Question

In which of the following molecules is hydrogen bond absent?

• A. Water
• B. Inorganic benzene
• C. Diborane
• D. Methanol

Answer 1

The correct option is C Diborane

As there is no lone pair of electrons present on the boron in diborane it do not form a hydrogen bond.But in water inorganic benzene and methanol there is a lone pair of electrons on oxygen, nitrogen and oxygen respectively so they form hydrogen bonding between most electronegative atom like nitrogen oxygen and hydrogen.
Hence option $D$ is correct.