Hi

MOHITPADOLE Said:

"Hi: I mistakenly bought USB C to 3.5 mm Jack Adapter and have Iphone XR which is compatible to USB Lightening Is it possible to get one?"

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Finding this Adapter:

Looking to Find and Purchase One?

Yes. They exist. See here: Lightning to 3.5 mm Headphone Jack Adapter - Apple

You are addressing this to another user and not to Apple in this forum.

Apple Support Community Forum

This is Apple Support Community forum, primarily for a user to user interaction for information & idea sharing between users, if need be, extend support on technical know-how in handling Apple products from a more experienced fellow user, This is not the right forum to discuss with Apple Inc.