Answer : The correct option is, (2) gas to liquid
Explanation :
Entropy : It is defined as the measurement of randomness or disorderedness in a system.
The order of entropy will be,
As we are moving from solid state to liquid state to gaseous state, the entropy will be increases due to the increase in the disorderedness.
As we are moving from gaseous state to liquid state to solid state, the entropy will be decreases due to the decrease in the disorderedness.
In option 1, 3 and 4, the entropy increases. while in option 2, the entropy decreases.
Hence, the correct option is, (2) gas to liquid