Question

Which of the following compounds will have the highest melting point?
(a) Chlorobenzene
(b) o- Dichlorobenzene
(c) m-Dichlorobenzene
(d) p-Dichlorobenzene

Answer 1

Explanation:

p - dichlorobenzene

• Therefore p - dichlorobenzene has highest melting point than the 0- and m- isomers. It has melting point of 53.5 degree Celsius.

Answer 2

Answer:

Option (D) p - Dichlorobenzene

It is more symmetrical than the o- and m- isomers. So, it fits more closely in the crystal lattice. Therefore more energy is required to break the crystal lattice of p - dichlorobenzene. Therefore p - dichlorobenzene has highest melting point than the 0- and m- isomers. It has melting point of 53.5 degree Celsius.

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