Which of the following compounds will have the highest melting point and why?
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Compound $( II )$
Reason: The molecular structure of compound $(II)$ shows that both the substituents $($i.e. $CH_3$ and $Cl)$ are at para position.
The para $-$ isomers have higher melting points as compared to their ortho and meta $-$ isomers.
It is due to symmetry of para $-$ isomers thatfits in crystal lattice better as compared to ortho $-$ andmeta $-$ isomers.
Reason: The molecular structure of compound $(II)$ shows that both the substituents $($i.e. $CH_3$ and $Cl)$ are at para position.
The para $-$ isomers have higher melting points as compared to their ortho and meta $-$ isomers.
It is due to symmetry of para $-$ isomers thatfits in crystal lattice better as compared to ortho $-$ andmeta $-$ isomers.
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