i am unable to import contacts its showing it contains invalid contact data

You can't use an iPhone to do that.

Unlike some Android devices, contacts are neither stored locally on an iPhone nor in SIM. They are synced to an email account that you had Google, iCloud, AOL, Exchange, Outlook, Yahoo or any Other

Try to export the contacts from google mail on a web browser. During Export select export as vCard and then

log in to https://www.icloud.com using your Apple ID credentials Tap Contacts app > Settings > Import vCard.

and Use that iCloud to enable Contacts on your device