Apex domains cannot have CNAME records.
Question and response
Question
dig mmchawla.com. NS
Answer
mmchawla.com. 5 NS ns-1108.awsdns-10.org.
mmchawla.com. 5 NS ns-878.awsdns-45.net.
mmchawla.com. 5 NS ns-543.awsdns-03.net.
mmchawla.com. 5 NS ns-932.awsdns-52.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0