Indicate which spectral technique, NMR, IR, UV or MS would most readily allow di
ID: 502530 • Letter: I
Question
Indicate which spectral technique, NMR, IR, UV or MS would most readily allow differentiation between compounds beton. A) IR b) MS c) NMR d) UV e) a and e are correct Consider the following spectrum for a conjugated diene. If a similar spectrum were taken for a conjugated tetraene, the lambda would be: a. Close to 217 nm b.Greater than 217 mm c. Less than 217 nm d. At exactly 200 nm What is the concentration of a solution of a plant pigment (E = 37, 500) if an Absorbance of 0.751 were obtained in a cell with a 5.00 cm path length? a. 267 times 10^-5 M b. 4.00 times 10^-4 M c. 2.00 times 10-5 M d. 1.78 times 10-4 M Which of the following carbons will not show a peak when a DEPT experiment spectrum is run? A. CH_3 b. CH_2 b. CH_2 c. CH d. quaternary C e. a, b, c If delta H for a monosbtituted alkene is 126kj/mol, which of the following system is most likely to be a conjugated systems? A. 3 double bonds, delta H = 376 kJ/mol b. 4 double bonds. delta H = 498 kj/mol c. 2 double bonds. delta H = 254 kj/mol None of these are likely to be conjugated. The structure of furan is given below: Furan can be classified us a) Aromatic b) ant aromatic c) nonaromatic d) Proaromatic Which diene dienophile will you choose to synthesize the following compound? The definition of aromatic compound is a Has a pleasant odor. b Has cyclic conjugation c Has 4n+2 pi electrons in conjugation d Has low reactivity e All the aboveExplanation / Answer
17. The answer is C, with the help of NMR we will be able sistinguish between both the organic compound
18. The answer is B
19. The answer is B
A= lc
where is molar absorptivity
l is path length in cm
c is the concentration
c= A/l = 0.751/ 37500*5 = 4 * 10-6
20. The answer is D
the cabons with no hydrogen attache to it, will not appear on DEPT 135
22. The answer is A
Furan are aromatic, as they are planar, conjugated, cyclic and obey (4n+2 )e- rule
23. The answer is C
24. The answer is E