13. Which compound is expected to show an intense ir absorption at 3050. Please

Question

13. Which compound is expected to show an intense ir absorption at 3050. Please help. I'm really struggling. If you can answer all that'll be great Organic Chemistry II Practice Exam 1 CHEM242 Section TYPE A TYPE A Professor Name 10. Which one is the base peak (daughter ion) in the mass spectrum of n-butyl isopropyl ether? d. 101 c. 73 a. 43 b. 57 11. What is the major purpose of using IR for organic chemists? b. Functional group identification a. Molecular weight determination c. Electronic structure determination 12. Which compound is expected to show an intense IR absorption at 3050 em12 a. (CHo) CHNH: b. (CH)CHCOH c. 2-methylhexene d. hex-1-yne 13. What is the approximate stretching frequency of an alkane C-C bond? d. None of the Above a. slightly less than 3000cm b. 1660 cm b. 1660 cm d. 1200 em c slightly more than 3000 em 14. Which finctional group would you expect to have the STRONGEST signal for IR spectroscopy a. Carbonyl c. alkene C-C 15. IR spectroscopy is valuable for the following reasons: b. Internal alkyne d. All have the same strength. a. IR gives evidence of functional groups. b. IR shows the absence of certain functional groups d. All of the above. c. IR can be used to confirm an unknown's structure by comparison to an authentic sample. 16. What does mass spectrometry measure? a. vibrations of bonds b. The molecular weight of a compound c. electronic transitions d. stereochemistry of functional groups

Explanation / Answer

It is option C. 2-methyl hexene because ===C----H strech of alkene or aromatics will show an intense IR absorption at 3050cm-1.

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