are covalent bonds broken when....
melt benzene
melt quartz
boiling C2H5OH
evaporating water
disolving bromine in water?
1 answer
You really need to define what you mean by covalent bond in order for us to answer this question. For example, hydrogen bonds are broken when C2H5OH is boiled but H bonds are only about 1/20 as strong as a regular covalent bond. Same thing for crystal structure. Are the bonds in the crystal structure of solid benzene covalent bonds by your definition.