Spring 2007 Test 2

Spring 2007 Test 2 - CHEM 226 TEST :2 {<€*f \ V} I...

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Unformatted text preview: CHEM 226 TEST :2 {<€*f \ V} I Dr. Wells, Spring 2007. Score = opscan * 741’18 + essay = fl * MEIS + i”: = £0 We \ fig ’Uo l/flfE It is tits/7030mm unethical, afldefieatlhg ta MEWS; this test wit/I students that have not yet taken it. Useful Equations: complementafl E = hv = hc/k h = 6.626 x 10 ‘34 J-s 0:3.00x108m/s =7w 620 orange blue A 2 8C] 680 red green >?00 IR Name these compounds without using the word “benzene”. (3 points) NH2 N02 N02 1)4_A;h:}xsfolugng OrJthDepfo aniHhc PmfliX‘f‘Qfie. J Draw the structure of these compounds. (3 points) CM F 0 F H L... (5 \_\ I: H O N p g s; ; 2,4.6-trifluorophenol ___:—k pyridine 2,3,4,5,6«hemfluorobenzenaIdehycle fa an Two essays follow worth 10 points each. / Essay B. 10 points. Draw and label the block diagram of the UWV is spectrophotometer. \ / /__ Q 25 / om \c (15%” ( (‘5'!wa mom {/hwvfiohr S P C} 2 dice: 50%(14 Draw the expected UWV is spectrum of carrot juice. Briefly (less than 25 words) explain the plot. UVNis Spectrum of Carrot Juice 4 8 le‘zfi :7 LVN) on , c 3 3 She {5 Mam/beck. I5 2 I 00%.; {b olssexufeJ_ (D .D 1 - <1 0 . 300 400 500 600 700 800 1(nm) J Essay C. 10 points. Using the p-attack of Br+ as an example, explain why the hydroxyl group (~OH) is a strong activator and orthofpara directing substituent. Show the mechanism for the formation of the arenium intermediate, its resonance structures, and the resonance hybrid in your explanation. H l/l : , Y1 t o. '6’. :0: ‘ - l3}? L__.., o flfcniUu-x is 3y.b{\.’2cé ‘9"? f/Cjbhm'WLQ.‘ I 0 As the wavelength of electromagnetic radiation increases _ .u——-.‘ A. its energy remains constant h ‘1. its energy decreases r _. l a) a... r: , fl 0 r y .. a a C. its energy increases @ D. the energy changes is unpredictable ?\ E E. none of the above L U 5 . _ '. (5 r 2. The lowes frequency lectronic transition in acetone is . i i E A.o->o* B.ir->rt* C.o->rt* D.rt->cr* E.r1—>rr* /C --—'*O"“ "x . . . (11., L’ H s .K it 3. Absorbance = concentratlon x molar abso t1v1t x H 1‘? 3/ CA). path length of sample 3! B. molarity of sample V“ C. pKa of sample 9» D. molar mass of analyte in sample 11 E. number ot‘moles of analyte in sample 4. The diene at the right does not undergo the Diels—Alder reaction because A. it is aromatic (3 it is not conjugated C. it is already bicyclic D. it does not contain a Huckel number of electrons B. it is not planar l,2,3,5,6,8a-hexahydronaphthalene 5. Fluorine is A. an O/P director and weak activator an OKP director and weak deactivator / fi :5. A. a M director and weak activator I) B. a M director and strong deactivator E. none of the above ‘3‘. It is difficult to make meta-xylene starting from benzene because A. of stories B. the amino group is such a Strong activator C. it is explosive D. the nitro group is a deactivator G) the methyl group is an ofp director 7. Diels—Alder reaction of a diene that is electron poor will occur most rapidly with a dienophile that is —v—’—'—‘—‘—--.‘____. A. electroneutral Q electron rich C. electron poor % D. sterieally hindered E. bicyclic S. A mixture ofproduets is formed by the reaction below. As 11 increases from 1 to 5. the percentage on in the product mixture will A. increase ecrease C. remain the same TF3 TF3 TF3 TF3 (CH2) (CH2) (CH2) (CH2 1} 11 ll 11 ——__—’r @ CF} 11:1, 2. 3. 4, 5. dab “*1. CF; 54;, N02 as h .r Aguflw off gym)“ 9. How many constitutional isomers are created by the monochlorination of phenalene? This means how many possible products are there in the product mixture? phcnalene I O. The “ring current” of an aromatic ring has been “measured” by A. a miniature voltmeter B. viscosity changes E C. ultraviolet f Visible spectroscopy . capacitance changes D (9 NMR I I 0 Which one of the following is not aromatic? I 2. How many constitutional isomers are created by the mononitration of the compound at the right? This means how many possible products are there in the product mixture? I 30 A The most abundant product in the product mixture ofthc reaction below will be \ OCH3 (F; j OCH3 OCH3 Cl 5+“ OCH Br 3 L/ ( Br A Brz l"; BBT3 OCH3 6 OCH3 OCH 03 Br OCH3 I 4. Which of the following would not be an OIP director? H H O O/H H CH3 0 l l n I l , o l ll :82 : N_C_H 0:820 :30, ‘ N—‘C—H A B (9 u E- l 6. Some sunscreens, like zinc oxide, work by scattering the light. Other sunscreens work when ® electrons are promoted to higher energy orbitals Br 0—H and/or C=O bonds Stretches are energized C. nuclear spins in aromatic complexes are flipped ) R D. rings are warped { E , E. acidic protons are transferred across the ring I 6. Successive nitrations as shown below become increasingly more difficult. NO2 OZN NO2 N02 N02 N02 The best explanation for this is A. increasing steric crowding increasing number of electron withdrawing groups C. increasing ring warping D. decreasing conjugation I 7. [101annulene is not aromatic because C? it is not planar . its lone pairs are perpendicular to the plane of the ring C. it does not contain a Huckel number of electrons D. it is not cyclic B. it contains an sp3 hybridized carbon I 8. _C_hicken in a car and the car won‘t go. That’s how you Spell A. New Orleans B. New York C. Albuquerque hieago E. San Diego D ...
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Spring 2007 Test 2 - CHEM 226 TEST :2 {&amp;lt;€*f \ V} I...

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