Which of the wavenumbers given corresponds to the c=0 double bond region on an ir spectrum?
1) 0 - 1500 cm⁻¹
2) 0 - 4000 cm⁻¹
3) 400 - 4000 cm⁻¹
4) 400 - 1500 cm⁻¹
5) 2100 - 2300 cm⁻¹
6) 1600 - 1850 cm⁻¹