Rank the following compounds from lowest to highest boiling point: strontium carbonate, ethane, methanol (CH4O), dimethyl ether (CH3OCH3).?

Strontium carbonate has the highest boiling point. This is because strontium carbonate is an ionic compound in which the opposite ions are held together by strong electrostatic forces, while all others are molecular compounds in which the molecules are held together by weaker intermolecular forces.

Among the rest three molecular compounds, methanol has the highest boiling point. This is because methapol molecules are held together by hydrogen bonds which is strongest intermolecular forces for molecules in comparable sizes.

Dimethyl ether is a polar compound in which the molecules are held together by dipole-dipole attractions, while ethane is a non-polar compound in which the molecules are held together by weaker instantaneous dipole - induced dipole attraction. Therefore, the melting point of dimethyl ether is higher than that of ethane.

Boiling point : ethane < dimethyl ether < methanol < strontium carbonate

Why not Google them individually? You should know that ethane is the only gas and strontium carbonate is the only solid so that leaves you with only another two to check out. Much more reliable than subjecting yourself to somebody else's guesswork.