\textbf{221.} Which of the following statements are correct?
A) In soap, the nonpolar part can form an unbranched hydrocarbon chain.
B) At constant temperature and pressure, the dissolution rate of NO gas is greater than that of $\mathrm{NH_3}$ and HCl gases.
C) By increasing pressure, the boiling point and vapor pressure of a solution increase.
D) The vapor pressure of a solution is lower than that of pure water.
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(1) A, D \qquad (2) B, C \qquad (3) A, B, C \qquad (4) B, C, D
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