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The correct order of volatility is;
A
NH3 < H2O
B
p–nitrophenol < o–nitrophenol
C
CH3OH > CH3 — O — CH3
D
HF > HCl
Explanation
In case of p-nitrophenol intermolecular hydrogen bonding takes place, which results in association of molecules. Hence decrease in volatility but in case of o-nitrophenol intramolecular hydrogen bonding takes place and hence no association between the molecules, which results in higher volatility. :contentReference[oaicite:0]{index=0}
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