Question

for each spectra shown calculate the degrees of unsaturation state the functional group that are indicated by thr spectra and their ir peaks and propose a structure. please complete all as soon as possible. thank you

For each of the spectra shown, (a) Calculate the degree of unsaturation (b) state the functional groups that are indicated by the spectra and indicate which IR peak(s) match(es) each, and (c) propose a structure CsH100 STT 2878 - 1170 - SACT 2984 ΘΤΣΙ 3500 4eea 3eee 28108 2502 1500

Answer 1

SOLN1

CX 2+2 - H - X+N C = number of carbon , H = number of Hydrogen X= number of Halogen ; N=number of Nitrogen DU = 5 x 2+2 - 10/2 = 1 This suggest that it have either 1 double bond or ring IR peak at 1716 is a strong evidence of C=O stretching frequency of aldehyde This can be confirmed by the presence medium peak at 27002900 cm-1 which corresponds to C-H of CHO group So, the probable structure will be pentanal

CsH100 2879 -S9C1 1170 C-H peak of CHO (C=0) peak of CHO 2002 1580 4000 3500 3000 250 2500 1eae pentanal

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