Jennifer the Awesome, after this question, I will not help out
with further questions until you've addressed the questions that
I've asked earlier but which you've ungraciously ignored. "Which
course of study are you asking these questions for, and which
country is this based in?"
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Ortho-nitrophenol has a lower melting and boiling point compared
to para-nitrophenol, because ortho-nitrophenol's capacity for
hydrogen bonding has been partially used up to form intramolecular
hydrogen bonds, and thus has less extensive intermolecular hydrogen
bonds.