Suggest the most important type of intermolecular attractive interaction in the following pairs. acetonitrile $\left(\mathrm{CH}_3 \mathrm{CN}\right)$ and acetone $\left(\mathrm{C}_3 \mathrm{H}_6 \mathrm{O}\right)$.
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A-B interactions are more than A-A and B-B interactions.
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Based on solute-solvent interactions, arrange the following in order of increasing solubility in n-octane and explain.
Cyclohexane, $\mathrm{KCl}, \mathrm{CH}_3 \mathrm{OH}, \mathrm{CH}_3 \mathrm{CN}$.
Note: In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices. Assertion: When $\text{NaCl}$ is added to water a depression in freezing point is observed. Reason:The lowering of vapour pressure of a solution causes depression in the freezing point.