Hi,

All the universities mentioned above are good for pursuing a master degree in Chemistry. The admission to central universities are conducted through Common entrance test conducted every year. The admissions to CU is conducted via entrance exam conducted by the college. However I suggest to go for central universities since it is has more legacy. CU is one of the fastest growing institutions and it is great but if you have a chance to go to central universities then go for it. Compared to Central university of Punjab and Rajasthan I think Punjab is better option. You can compare the college of your choices by using the college comparing tool and can opt best one for you. The link is given

https://www.careers360.com/compare-colleges

All the best.