17. An msihel mMlecular ion peak usully ndicates the presencedber of nitrogen a.

Question

17. An msihel mMlecular ion peak usully ndicates the presencedber of nitrogen a. absent even c. intense d. odd 18. The mass spectrum of alcohols often fails to exhibit detectable M' peaks, but instead show relatively large peaks. a. M- 16 b. M-18 d. M+2 c. M+1 19. Which functional group will be recorded at the lowest (smallest wavenumber) IR frequency? a. ketone carbonyl b. ether (C-O bond) c. alkyne (C-H bond)d. alkene (C-H bond) 20. Internal alkynes often have weak or absent IR stretching frequencies for the following reason: a. The alkyne triple bond does NOT vibrate b. The alkyne triple bond is very floppy c. Alkynes have small dipole moments 21. What does infrared (IR) spectroscopy measure? a. vibrations of bonds c. electronic transitions d. All of the above. b. The molecular weight d. stereochemistry of functional groups

Explanation / Answer

Answer:

17) odd

18. 'a' M-16

19. alkyne (C-H bond), it contains a triple bond, so dipole moment of a compound will be zero.

20. 'c' alkynes have a small dipole moment.

21. a vibration of bonds

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