Practice_Quiz_13

Practice_Quiz_13 - According to one version of Beer's law,...

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(B) (C) + O O O heat C 8 H 8 O 3 + Br 2 low temperature two constitutional isomers (ignore stereoisomers) + (1) Provide the missing products inside the boxes as requested. + O O N-Br (one equivalent) h ν CCl 4 + two products C 6 H 9 Br C 4 H 5 NO 2 (A) (peroxides) Br O O N-H BrCH 2 CH=CHCH 2 Br CH 2 =CHCHBrCH 2 Br O O O H H Practice Quiz 13
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(D) + COOEt EtOOC heat C 14 H 20 O 4 COOEt COOEt H H H 3 C H 3 C CCH 3 O = + diene dienophile CCH 3 O (E) Provide the reactants for the Diels-Alder reaction below. H 3 C H 3 C CCH 3 O CCH 3 O H H
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(2) Provide resonance structures as requested below, circle the more or most stable resonance structure and draw a structure for the hybrid inside the box. (A) CH 2 -OCH 2 CH 3 .. .. + (B) + (C) NH 2 + CH 2 =OCH 2 CH 3 .. + CH 2 OCH 2 CH 3 δ + δ + + + δ + δ + δ + NH 2 + NH 2 + .. .. NH 2 δ + δ + δ +
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(3) Answer the following questions about chromophores. I II I II (A) In each pair of alkene isomers below, which compound will show a longer wavelength ultraviolet-visible absorption band. CH 3 CH 2 CCH 3 O CH 2 =CH-CHCH 3 OH I II λ max = 275 nm, ε = 25 I II λ max < 200 nm, ε = 12,000 (B) Match the correct structure in each pair below with the ultraviolet absorption data.
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Unformatted text preview: According to one version of Beer's law, A = x b x C, where b is the pathlength of the cell in cm and C is the concentration in molar units. 450 = A/(b x C) = 1.00/(1.00 cm x 1.00 x 10-5 M) = 1.00 x 10 5 cm-1 M-1 (C) Compound A shows an intense absorption in the visible at 450 nm. A pure sample of A in ethanol (1.00 x 10-5 M ) has an Absorbance = 1.00 when measured in a 1.00-cm cell. What is the molar extinction coefficient at 450 nm? 450 = (4) Draw the structure of the most stable intermediate in the addition of Br 2 to 1,3-pentadiene, and the two products produced. CH 3 CH=CH-CH=CH 2 + Br 2 CH 3 CH CH CH-CH 2 Br + + CH 3 CH CH CH-CH 2 Br + + CH 3 CH=CHCHBrCH 2 Br CH 3 CHBrCH=CHCH 2 Br 1,2-addition product 1,4-addition product...
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Practice_Quiz_13 - According to one version of Beer's law,...

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