Carboxylic Acids Have Unusually High Boiling Points Because

Carboxylic acids have unusually high boiling points because:

A) they are significantly heavier than organic molecules with the same molecular weight.
B) they repel each other in the gas phase.
C) they strongly attract each other in the liquid phase.
D) they are usually solids,and solids are not volatile.
E) they exist mostly as ions (RCO₂- + H⁺) and ionic materials are not volatile.