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Solution


Q.

The correct order of melting points of dichlorobenzenes is                 [2023]
1  
2  
3  
4  

Ans.

(4)

Boiling points of isomeric dihalobenzenes are nearly the same. However, the para-isomers has high melting point as compared to their ortho and meta-isomers. It is due to symmetry of para-isomers that fits in crystal lattice better as compared to ortho- and meta-isomers.

b.p./K  453  446  448
m.p./K  256  249  323

Bromo, iodo and polychloro derivatives of hydrocarbons are heavier than water. The density increases with increase in number of carbon atoms, halogen atoms and atomic mass of the halogen atoms.