Arrange the following in order of increasing melting points.
CsCl, BaCl2, diamond (C), H2, HF
a. H2 < HF < BaCl2 < CsCl < diamond
b. HF < H2 < CsCl < BaCl2 < diamond
c. H2 < HF < CsCl < BaCl2 < diamond
d. H2 < HF < diamond < CsCl < BaCl2
e. HF < H2 < diamond < CsCl < BaCl2
Answer: C