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Among para-, meta-, ortho-dichlorobenzene, the **melting point** is highest for:
Aortho-isomer
Bmeta-isomer
Cpara-isomer (symmetric, packs tightly in crystal lattice)
DAll equal
Answer & Solution
Correct answer: C. para-isomer (symmetric, packs tightly in crystal lattice)
Para-dichlorobenzene has highest m.p. because its symmetrical linear structure packs efficiently in the crystal — stronger lattice energy. Ortho/meta have less efficient packing.
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