S. No. | N-R | Groups | ||||
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1 | Methyl | 1617 | 1540 | 1326 | 541 | 488 |
2 | Ethyl | 1618 | 1543 | 1326 | 540 | 469 |
3 | Propyl | 1613 | 1552 | 1332 | 533 | 461 |
4 | Butyl | 1612 | 1564 | 1329 | 532 | 475 |
5 | Pentyl | 1615 | 1542 | 1332 | 549 | 496 |