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alkyl chain-bearing IL [hdmim][Br] was found to be least
effective. Thus, by judiciously analyzing the effect of
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Acknowledgements Council of Scientific and Industrial Research,
Government of India supported this work vide (Grant
No. 21(1005)/15/EMR-II) through Emeritus Scientist grants to A. Pal.
Ankita Pillania gratefully acknowledges University Grants Commis-
sion (UGC), New Delhi, India for providing SRF fellowship through
letter no. F.17-39/2008(SA-I). Department of Chemistry, Panjab Uni-
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