CHE 240 Pre Finals Homework Questions with Answers | 2025 Update with complete solutions.

CHE 240 Pre Finals Homework with answers

1.For the IR spectra shown below:
(a) Calculate the degree(s) of unsaturation (b)what are the functional groups indicated ?
Match the peaks to each of the corresponding functional group. © propose a structure


Formula: C4H8O




(b)




Formula: C4H8O2




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2. The IR and NMR spectra shown are for a compound of formula C8H10. Propose the
structure and match the peaks to the corresponding parts of the structure.

C9H10




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, (d)



A compound with molecular formula C9H10O2 exhibits a triplet at 1.2 (I=3), a quartet at
2.6 (I=2), a multiplet at 7.3 (I=4), and a singlet at 11 (I=1) in its 1HNMR spectrum.
What is the structure for this compound?




3. Complete the following reaction scheme:

(a)




(b)




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