1. Department of ChemistryNorth Eastern Hill University Shillong 793022 India
2. Present Address: C. I. College, Bishnupur Manipur 795126 India
3. Department of ChemistryNational College Tiruchirappalli 620 001 India
4. Mahatma Gandhi‐Doerenkamp Center for Alternatives to Use of Animals in Life Science EducationBharathidasan University Tiruchirappalli 620024 India
5. Department of ChemistryBharathidasan University Tiruchirappalli 620024 India