Hi,

According to his percentile, his expected rank would be around 8013 - 9008 . Now, this is a really good rank and he have strong chances to get in NITs and IIITs too. Nowadays all the B.tech courses focus a similar syllabus pattern and most of them have chemistry as a subject for one semester in the first year as it required in almost every stream.  If you want to avoid chemistry you must not go for chemical engineering. or fields related to it like polymer engineering etc.

I hope this helped you.