Which of the following alcohols is not is not miscible in water?

Options

A. Methnol
B. Ethanol
C. Propan-l-ol
D. Butan-l-ol

Answer

4

Explanation

For the series of alcohols (organic or carboncontaining, compounds with an -OH group), the solubility in water decreases from miscible to slightly solube. Water and alcohols are alike in having -OH groups through which strong hydrogen bonding -OH groups through which strong hydrogen bonding attractions arise

The attraction between a methanol molecule, `CH_(3)OH`, and a water molecule is nearly as strong as that between two methanol molecules or between two water molecules. Thus methanol and water molecules tend to mix freely.
Methanol and water miscible, as are ethanol and water and propan-1-ol and water. However, as the hydrocarbon end, R-, of the alcohol becomes the more prominent portion of the molecule, the alchol becomes less like water. Now the forces of attraction between alcohol and water molecules are weaker than those between two alcohol molecules or between two water molecules. Therefore, the solubility of butane-1-ol in `H_(2)O` is just `7.9 g//100 g H_(2)O` at `20^(@)C`.