Higher the melting point,greater are the forces holding the constituent particles together and hence greater is the stability.
Melting points of the substance are given below
Higher melting point of water than alcohol shows that hydrogen bonding in ethyl alcohol molecules is not as strong as in water molecules.
Diethyl ether is a polar molecule
Methane is a non-polar molecule
Methane has only weak vander waal's forces (London dispersion forces)