Regarding wrong mention of the state in itr-1

which return ITR for 2016-17 or 2015-16....?

if it is possible to revise under section 139(5), you can revise the return

ok ....you can revise the return.

both copies of ITR (original ITR and revised ITR ) should be send to CPC for verification

Mentioning wrong state does not alter IT filing, your jurisdiction remains same irrespective of which state you mentioned, one can ignore it as long as other data is correct. As mentioned above you have an option to revise the ITR before processing u/s 139(5) conveniently, in case you are doing e-verification no need to worry for sending the acknowledgment copies to CPC bangalore.