I need 4 days leave while I am in notice period in Infy, can we do this? If yes, will this affect my last working day?

This is a deliberate grey area maintained by the rangoli idiots in the policy.
They will say you cannot take leave, or the last date will be extended. or they will deduct the pay for the leave taken and claim it as policy

the worst part, some time they will not even pay for the unused leaves and claim it as policy. This is what i heard from a friend who worked in Infy.

Take sick leaves, if your manager doesn't understands, ofc np will increase