Which of the following is steam volatile?

Ap-hydroxybenzaldehyde
Bp-nitrophenol
Cm-nitrophenol
Do-nitrophenol

Answer: D

o-Nitrophenol has intramolecular hydrogen bonding, so it does not associate with other molecules and is relatively volatile; it distils with steam. The other three are held together by intermolecular hydrogen bonds, which lowers volatility.

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