Hi Prashant,
Answer to your querries are mentioned below:
1. Yes, he would be entitled for leave encashment as it is every employee's right to get that but it depends on company's policy whether to encash CL/SL. Ideally only EL are encashed.
2. Yes, he would be entitled for bonus as well, if mentioned in salary break-up in Appointment Letter.
3. Company has full right to deduct salary in lieu of not serving the notice period (only if mentioned in Terms n Conditions in Appointment Letter).
Kindly check his Appointment Letter before Full n Final settlement papers.
Regards
Akangi