Spontaneity

Entropy decreases in crystallisation of sucrose from solution.

It is a measure of randomness or disorder of the system. Greater the randomness, higher is the entropy. Order of randomness or entropy for solid liquid and gas is : gas liquid solid.

In dissolving sucrose in water and melting of ice solid state is changing to liquid state, hence entropy increases.

In vaporisation of camphor, solid state is changing to gaseous state, hence entropy increases.

In crystallisation of sucrose from solution, liquid state is changing to solid state, hence entropy decreases.