Answer:
correct option: 1
Explanation:
As given in the question that gas are taken from one sate to another state through different paths and asking which quantity will always remains same.
1. internal energy of gas is not path dependent so internal energy will remains same it depend only on the initial and final point .
2. Heat and work are path dependent means its matter the gas is taken by which path. so option 2 and 3 are wrong.