Explanation

Methylamine and hydrogen peroxide are liquids due to Hydrogen bonding. 

Hydrogen bonding is a strong type of intermolecular force

That occurs when a hydrogen atom is bonded to a highly electronegative atom 

Like oxygen, nitrogen, or fluorine. In methylamine (CH3NH2)

The nitrogen atom has a lone pair of electrons and can form hydrogen bonds with other methylamine molecules.

Similarly, hydrogen peroxide (H2O2) has hydrogen atoms bonded to oxygen atoms, allowing for hydrogen bonding.

These strong hydrogen bonds hold the molecules together in the liquid state.