Kindly verify that the clusterware installation has been done successfully with the following verification utility:
cluvfy stage -post crsinst -n rac1,rac2 -verbose.
If the output contains any error, try fixing it first.
And you can use SCAN ip in /etc/hosts only if you are using 126.96.36.199 Grid software. But if you are using the later version, you have to define the DNS entry.