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  4. The order of melting point of ortho, para, meta-nitrophenol is

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Q. The order of melting point of ortho, para, meta-nitrophenol is

AMUAMU 2019

Solution:

Due to intra molecular hydrogen bonding in ortho-isomer, it has least m.p. Due to effective intermolecular hydrogen bonding in para-isomer, it has highest melting point among the isomers. So, the order is
$\underset{(114^{\circ}C)}{\text{para}} >\, \underset{(97^{\circ}C)}{\text{meta}} >\, \underset{(45^{\circ}C)}{\text{ortho}}$