Question

Bonus question (20 points) Given that 1,3-butadiene has a uv absorption of 217nm, predict with justification, the approximate absorption for the conjugated system in vitamin D3 (10 points) was prepared using 0.0010 g of a compound, Mw 255 /mol, in 100 mL of ethano. Spectrum was measured in a 1-cm cell. The solution had 2max 235 nm with absorbance 0.74. What is the value of molar absorptivity of the compound at 235 nm? (10 points)

Answer 1

this is conjugated system and there is symmetry allowed pi-pi* transition occurs. thus the absorbance should be high.

2 OO0l0 -6 255 aIanol x lo6 nble 3.92 xo о.too L motar absorptiv; (c) = 188700 MIcewn)