Sections 3, 4 and 5 not to apply in certain cases

6. The provisions of sections 3, 4 and 5 shall not apply -

1. (i) to the termination of service of any 3[employee] who is appointed for a temporary period only;
2. (ii) to the termination of service of any 3[employee] appointed on probation, during or at the end of the period of probation, on account of his work or conduct being unsatisfactory; [and]
3. (iii) to 3[an employee] who is dismissed or removed or reduced in rank on the ground of conduct which has led to his conviction on a criminal charge. 5[(iv) *]