Apex domains cannot have CNAME records.
Question and response
Question
dig monster.co.in. NS
Answer
monster.co.in. 3 NS ns-415.awsdns-51.com.
monster.co.in. 3 NS ns-1546.awsdns-01.co.uk.
monster.co.in. 3 NS ns-1164.awsdns-17.org.
monster.co.in. 3 NS ns-522.awsdns-01.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0