Taxed in which head?

Mr X is director of foreign company, company registered outside India. Mr X is Resident and Ordinary Resident(R&OR) of India and Till now Mr X treated income from this company as professional income. That foreign company is on sale and Mr X going to receive approximately Rs. 2. 5 crore as compensation.

1. In which head taxability arise to Mr x?
2. Is tax audit applicable to Mr X?
3. What foreign income disclosures required?
4. RBI's permission required?