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				| 1. | In Infrared spectroscopy, at what wave number will band of CO bond of aldehyde will occur? | 
| A. | 1500 cm<sup>-1</sup> | 
| B. | 1495 cm<sup>-1</sup> | 
| C. | 1965 cm<sup>-1</sup> | 
| D. | 1700 cm<sup>-1</sup> | 
| Answer» E. | |