Mock Exam Three - 1.) The compound shown is planar, and all...

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1.) The compound shown is planar, and all the C-C bond lengths are the same. What can you deduce about the bonding of boron from these observations? B CH 3 a) The boron is sp2 hybridized and the p orbital contains an unshared pair of electrons. b) The boron is sp3 hybridized and a hybrid orbital contains an unshared pair of electrons. c) The boron is sp3 hybridized and a hybrid orbital is vacant. d) The boron is sp2 hybridized and the p orbital is vacant. e) None of the above. 2.) Which one of the following is best classified as a heterocyclic aromatic compound? a.) NH b.) NH c.) N d.) N e.) NH 2 3.) How many pairs of degenerate π molecular orbitals are found in benzene? a) 6 b) 5 c) 4 d) 3 e) 2
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4.) Which is the correct name of the compound shown below? NO 2 NO 2 Cl a) 1-chloro-2,5-dinitrobenzene b.) 2-chloro-1,4-dinitrobenzene c) 1-chloro-p-dinitrobenzene d.) p-dinitrochlorobenzene e) More than one of these is correct. 5.) How many benzylic hydrogens are present in the molecule shown below? a) 3 b) 4 c) 5 d) 6 e) 8 6.) Consider the following statements concerning the effect of a trifluoromethyl group, ~CF3, on an electrophilic aromatic substitution. I. The ~CF3 group will activate the ring. II. The ~CF3 group will deactivate the ring. III. The ~CF3 group will be a meta director. IV. The ~CF3 group will be an ortho, para director. Which of the statements above are correct? a) I, III b) I, IV c) II, III d) II, IV e) None are correct.
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Which one of the following is the most stable? a.) C + NH 2 H Br b.) C H + NH 2 H Br c.) NH 2 + H Br d.) C H + NH 2 H H Br 8.) All the following groups are activating ortho, para directors when attached to a benzene ring except : (ignore the negative charges) a.) ~ O - CH 3 b.) ~ N H - O CH 3 c.) ~ Cl - (deactivating) d.) ~ O - O CH 3 e.) ~ N - CH 3 CH 3 9.) Which of the following phenols has the largest pK a value (less acidic/more basic—CH 3 will not stabilize b/c it is EDG)? a.) OH Cl b.) OH NO 2 c.) OH CH 3 d.) OH CN 10.) Which of the following is antiaromatic ? a.) C - H b.) C + H c.) H H d.) H H 3 -hybridized. 11.)
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Mock Exam Three - 1.) The compound shown is planar, and all...

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