Question

Assertion : Melting points of isomeric dihalobenzenes are nearly the same.
Reason : Isomeric dihalobenzenes have different molecular masses.

• A. If both assertion and reason are true and reason is the correct explanation of assertion.
• B. If both assertion and reason are true but reason is not the correct explanation of assertion.
• C. If assertion is true but reason is false.
• D. If both assertion and reason are false.

Answer 1

Answer: (D)

The para-isomers are high melting as compared to their ortho- and meta- isomers. This is due to symmetry of para-isomers that they fit in crystal lattice better as compared to ortho- and meta-isomers.