You can place market orders for deep ITM nifty and bank nifty options contract.
Market orders are blocked for other scrips as ITM contract could be illiquid and the bid-ask spread could be very high which could affect your PnL. The bid-ask price could be far from the LTP of the contract.
When both cash and collateral margins are available, which one is utilized first? What is the order of utilization?
What is the margin blocking percentage during the end-of-expiry week for physical settlement of stock option contracts?
Can I do intraday trading in stock options?
When does expiry take place for Nifty, Bank Nifty, Sensex, Bankex, and stock option contracts?