Consider the following spectrum for a Conjugated diene. If a similar spectrum we
ID: 502565 • Letter: C
Question
Consider the following spectrum for a Conjugated diene. If a similar spectrum were taken for a conjugated tetraene, the lambda _max would the: 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 (epsilon = 37, 500) if an Absorbance of 0.751 were obtained in a cell with a 5.00 cm path length? a. 2.67 times 10^-5 M b. 2.00 times 10-5 M c 2.00 times 10^-6 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 In The structure of furan is given below: Furan can be classified is ________ Which diene and 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) Ans = e
The given two compounds are differentiated by using IR and NMR.
19) Ans = b
A = ecl
c = A / el
= (0.751)/ (37500 M–1cm–1) (5 cm)
= 4 x 10-6 M
c = 4 x 10-6 M
Therefore, concentration of solution = 4 x 10-6 M
20) Ans = d
DEPT spectrum do not show quarternary C.
DEPT shows CH,CH2,CH3 peaks.
22) Ans = a
Furan is aromatic.
Furan has 6 pi electrons i.e. 4n+2 pi electrons for n= 1
23) Ans = c
24) Ans = c
Aromatic = 4n+2 pi electrons in conjugation.