w_spec_all - Exam Name_ MULTIPLE CHOICE. Choose the one...

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Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question 1) Which compound would be expected to show intense IR absorption at 3300 cm - 1 ? A) butane B) CH 3 CH 2 C u CH C) CH 3 C u CCH 3 D) but - 1 - ene 1) 2) Which compound would be expected to show intense IR absorption at 2820, 2710 and 1705 cm - 1 ? A) CH 3 COCH 2 CH 3 B) CH 2 U CHCOCH 3 C) PhCOCH 3 D) PhCHO 2) 3) Which compound would be expected to show intense IR absorption at 2250 cm - 1 ? A) (CH 3 ) 2 CHCN B) CH 3 CH 2 CH 2 CO 2 H C) CH 3 CH 2 CH 2 CONH 2 D) (CH 3 ) 2 CHCH 2 OH 3) SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 4) Which compound would be expected to show intense IR absorption at 1680 cm - 1 ? 4) ESSAY. Write your answer in the space provided or on a separate sheet of paper. 5) Deduce a possible structure for the compound with the IR absorptions below. C 3 H 3 Br: 3300, 2900, 2100 cm - 1 6) Deduce a possible structure for the compound with the IR absorptions below. C 3 H 5 N: 2950, 2250 cm - 1 7) Deduce a possible structure for the compound with the IR absorptions below. C 5 H 8 O: 2950, 1750 cm - 1 8) Deduce a possible structure for the compound with the IR absorptions below. C 4 H 8 O: 2950, 2820, 2715, 1715 cm - 1 1
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9) Deduce a possible structure for the compound with the IR absorptions below. C 6 H 10 : 3040, 2980, 1660 cm - 1 10) How could IR spectroscopy be used to distinguish between the following pair of compounds? CH 3 OCH 2 CH 3 and CH 3 CH 2 CH 2 OH 11) How could IR spectroscopy be used to distinguish between the following pair of compounds? HOCH 2 CH 2 CHO and CH 3 CH 2 CO 2 H 12) How could IR spectroscopy be used to distinguish between the following pair of compounds? CH 3 COCH u CHCH 2 CH 3 and CH 3 COCH 2 CH 2 CH u CH 2 13) How could IR spectroscopy be used to distinguish between the following pair of compounds? CH 3 CH 2 C U CH and CH 3 C U CCH 3 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question 14) Ethyne (HC U CH) does not show IR absorption in the region 2000 - 2500 cm - 1 because: A) C U C stretches occur at about 1640 cm - 1 . B) there is a change in the dipole moment when the C U C bond in ethyne stretches. C) there is no change in the dipole moment when the C U C bond in ethyne stretches. D) C ± H stretches occur at lower energies. 14) ESSAY. Write your answer in the space provided or on a separate sheet of paper. 15) Describe the molecular ion region in the mass spectrum of CH 3 CH 2 Br. 16) 2 - Methylhexane shows an intense peak in the mass spectrum at m/z = 43. Propose a likely structure for this fragment. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question 17) Which compound would show a larger than usual M + 2 peak in the mass spectrum? A) CH 3 CH 2 SCH 3 B) (CH 3 ) 2 CHNH 2 C) CH 3 (CH 2 ) 2 CH 3 D) CH 3 CH 2 CO 2 H 17) 18) Which compound would be expected to show intense IR absorption at 1715 cm - 1 ?
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This note was uploaded on 12/17/2010 for the course CHEM 101 taught by Professor Silva during the Spring '08 term at Binghamton University.

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w_spec_all - Exam Name_ MULTIPLE CHOICE. Choose the one...

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