Question

13. Which structure is most consistent with the following IR spectrum? 100 TRANSMITTANCE [%] 50 0 4000 3000 1000 500 2000 1500 WAVENUMBER (-1) ОН OH Н 11 III IV a. I b. II c. III d. IV e. V

Answer 1

Answer 2

Trans- mittance no t% 3000 2000 1500 1η και IR spectrum, we get two characteristie bands Broad band from 2500 - 3300cm) centred around i 3000 ein (=o Stretching band at 1650-1750an!

Broad band should only for the above mentioned both peaks present, - CoolH group i one is (a) broad bang centred around this is 3000 2. тема as H to it appears as sharp peak at OH stretching band of & hydrogen bounded, broad, ;;) Other is 6 Iching This Peak of. Io. (2) 1700 en is eto stretch ot ketone A Aldehyde (W) (2) broad band should not be fresent, (a) broadband should be absent and there must be one C-H band. at 2700 cm とハ & Broad band should be absent olt 앴 be present but Peak at 1700 ein! should be absent.

i', Presence of bothe the characteristic Pears (a, b) dictates presence of coolt group o Answer is albu ک olt