Butanol refractive index July 8, 2019 16 32 64 128 1 butanol refractive index N butanol refractive index Tert butanol refractive index 3 methyl 1 butanol refractive index 2 butanol refractive index T butanol refractive index 2 methyl 2 butanol refractive index 3 methyl 2 butanol refractive index Isobutanol refractive index