1. Department of Chemistry, Motilal Nehru College, University of Delhi, Delhi, India
2. Department of Chemistry, Sri Aurobindo College, University of Delhi, Delhi, India
3. Department of Chemistry, A.R.S.D. College, University of Delhi, Delhi, India
4. Department of Chemistry, Daulat Ram College, University of Delhi, Delhi, India
5. Department of Chemistry, R.D.S. College, B. R. A. Bihar University, Muzaffarpur, India