The correct sequence of order of increasing solubility in the n-octane is:

1. Cyclohexane < CH₃CN < CH₃OH < KCl

2. KCl < CH₃OH < CH₃CN < Cyclohexane

3. KCl < CH₃OH > CH₃CN < Cyclohexane

4. None of the above

The insoluble compound in water is /are:

1. Phenol

2. Formic acid and toluene

3. Phenol and toluene 

4. Toluene and chloroform

The solubility of a gas in a liquid decreases with an increase in temperature because:

The example of gas in a solid type solution is:

1. Solution of hydrogen in palladium.

2. Ethanol dissolved in water.

3. Camphor vapours in N₂ gas.

4. Amalgams.