1) IIT GANDHINAGAR

2) SARDAR VALLABHBHAI NATIONAL INSTITUTE OF TECHNOLOGY (Surat)

3) Institute of Technology and Management University (Vadodara)

4)DAIICT

5)CEPT UNIVERSITY ( AHEMDABAD)

These are the best colleges one can go for CS.

Hello parmar
The top 10 colleges for computer science engineering are as follows -
1.Indian Institute of Technology, Gandhinagar
2.Sardar Vallabhbhai National Institute of Technology
3.Nirma Univeristy Institute of Technology
4.Dhirubhai Ambani Institute of Information and Communication Technology
5.Faculty of Technology, Dharmsinh Desai University
6.G. H. Patel College of Engineering and Technology, Charutar Vidyamandal
7.Ahmedabad Institute of Technology
8.Babaria Institute of Technology
9.L. D. College of Engineering
10.A. D. Patel Institute of Technology (ADIT)

Hello Parmar,
There are a lot of colleges available in Gujrat for Chemical Engineering. Please refer the below link for the answer of your query.

http://www.engineering.careers360.com/colleges/ranking/2016/top-engineering-colleges-in-gujarat