question_answer

Naphthalene is a/an:

A) ionic solid           

B) covalent solid

C) metallic solid     

D) molecular solid

Correct Answer: D

Solution :

Molecular crystals may be polar molecular crystal (held together by weak polar forces) or non polar molecular crystals (held together by weak van der Waal forces). Naphthalene is a nonpolar type molecular crystal, van der Waal forces increase with molecular size. This is the reason why iodine is solid while bromine is a liquid and chlorine is a gas. Naphthalene sublimes easily.