Computer science engineering are trending at present day.
Placement scenario from this branch is phenomenal, almost all the students made into campus placement from their respective college , there demand is high.
Where in case of chemical engineering, it's not a trending branch , don't have much recruitment but if college is good then almost all the students got placed.

If you have interest in both u can go for cse which have wide opportunities itts my suggestion ok

Hey as per current scenario I would suggest you to go forCSE job oppurtunities are many and there is too much exposure 

chemical is not that widespread as few people take it moreover all companies are at remote locations