1. Department of Chemistry, Khalsa College, Amritsar 143002, Punjab, India
2. Department of Chemistry, L. K. College, Jalandhar 144008, Punjab, India
3. Department of Chemistry, G. M. N. College, Ambala Cantt 133001, Haryana, India
4. Department of Chemistry, G.N.D.U., Amritsar 143005, India
5. Department of Chemistry, D.A.V. College, Jalandhar 144008, Punjab, India