Apex domains cannot have CNAME records.
Question and response
Question
dig imc.ua. NS
Answer
imc.ua. 5 NS ns2.imc-ua.net.
imc.ua. 5 NS ns.imc-ua.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0