Discussion
The compound which has the highest freezing point (in K) is
Answer: D
The highest freezing point belongs to H2O.
Water freezes at 273 K, because its molecules are held by strong, extensive hydrogen bonding into an ordered solid.
The others freeze far below this: chloroform at about 210 K, carbon disulphide at about 162 K, ethanol at about 159 K and diethyl ether at about 157 K. Ethanol can hydrogen-bond, but only through one OH group per molecule, and its ethyl group disrupts packing.
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