Is Slapping a Wife a Crime?

No, it's never just a slap. It's domestic violence, it's the beginning of a more severe physical form of violence. It is a crime.

Is it OK to slap your wife?

Yes , slapping is considered to be domestic violence.

What is the punishment for slapping wife in India?

Section 354: Assaulting a women or using criminal force on her with the intention of outraging her modesty- It implies that the assault must be on a women and that the accused must have used criminal force on her intending to outrage her modesty. The punishment is of at least one year which may extend to five years.