ORGANIC QUIZZES - TOPIC 5 Structure Determination SET C
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QUESTION 1. The use of IR spectra in identifying organic compounds is useful in many different ways. Which of the following CANNOT be determined from an IR spectrum?

(A) Existence of O-H bonds
(B) Existence of C=O bonds
(C) The identification of the unkonwn compound by comparison with a database of IR spectra for known compounds
(D) Existence of C=C bonds
(E) None of the above

QUESTION 2. What might be expected of the IR spectra of butanal and butanoic acid when compared to one another?

(A) They have identical fingerprint regions
(B) Both have large absorptions in the 3300cm-1 range
(C) Only butanal would should absoprtion bands due to C-H bonds
(D) Both have a large absorption at approximately 1700cm-1
(E) None of the above

QUESTION 3. Bromine has two common isotopes, Br-79 and Br-81, that occur in an approximate 1:1 ratio. What would one expect to find in the mass spectrum for bromobenzene?

(A) A large peak at a m/z value of 78
(B) A large peak at a m/z value of 77 and only one molecular ion peak
(C) A large peak at a m/z value of 77 and two molecular ion peaks of differing heights
(D) A large peak at a m/z value of 77 and two molecular ion peaks of the same heights
(E) None of the above

QUESTION 4. Which of the following is NOT true for propanone?

(A) Its IR spectrum would have an absorption at approx 1700cm-1
(B) Its Mass spectrum would have a peak at a m/z value of 43
(C) Its Mass spectrum would have a peak at a m/z value of 58
(D) It proton NMR spectrum would show three separate peaks
(E) None of the above

QUESTION 5. Consider the mass spectrum of chloroethane. The molecular ion peak(s) would be expected to be consistent with which of the following?

(A) One peak at a m/z value of 66
(B) One peak at a m/z value of 64
(C) Two peaks at m/z values of 66 and 64 in a 1:3 ratio
(D) Two peaks at m/z values of 66 and 64 in a 1:1 ratio
(E) None of the above



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