Given this spectrum, only one of the molecular formulas shown in part a is possi

Question

Given this spectrum, only one of the molecular formulas shown in part a is possible. What is the molecular formula, and explain how you know.

List:

C7H4O

C5H5N2

C4H11ClN

C2H6FN3O

C8H10

C6H7N2

CH2BrN

C5H14FN

C5H5N

C6H5NO

C3H6FNO2

C6H4O2

CH5NO3

C6H2NF

C5H5N3

C5H12S

C7H9N

C6H7

2b) The IR spectrum for the molecule in part a is shown below. LOD SD 4100 3000 200D 1500 1000 580 500 HAVENUMBERI Given this spectrum, only one of the molecular formulas shown in part a is possible. What is the molecular formula, and explain how you know.

Explanation / Answer

List of choices-comment and remarks on them on them: All choices with No Oxygen are rejected as can’t give carbonyl functionality.

1)C7H4O : 6 unsaturation sites. May contain carbonyl group and phenyl ring but then carbonyl group need to be conjugated with ring and the absorption for c=o must be near 1680 only.but why peak 1710 ?.still need to answer hence Rejected.

2)C2H6FN3O : no aromatic ring possible. Enough C not present

3)C6H5NO : 5 Unsatuaration sites 1C=O C=C 1Ring but

4)C3H6FNO2:U.S = 2    1C=O and 1C=C and NH2 group may present

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