Q. Which of the following isomer has the highest meltingpoint:
(a) 1,2-dicholorbenzene
(b) 1,3 -dichlorobenzene
(c) 1,4-dicholorbenzene
(d) all isomers have same melting points
Answer: (c) 1,4-dicholorbenzene ( para isomers are more symmetric and ortho and meta )