Apex domains cannot have CNAME records.
Question and response
Question
dig hin.ch. NS
Answer
hin.ch. 5 NS ns-1774.awsdns-29.co.uk.
hin.ch. 5 NS ns-476.awsdns-59.com.
hin.ch. 5 NS ns-613.awsdns-12.net.
hin.ch. 5 NS ns-1240.awsdns-27.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0