15. Which of the following information is primaridy obssined from ih A. arrangem

Question

15. Which of the following information is primaridy obssined from ih A. arrangement of carbon and hydrogen atoms in a compouna C. ary conjugated a system present in a compound E, all of these D. functional groups present in a compound 16. Which of the following vibrations are observed in IR spectroscopy A stretching B. rotational C. bending D. A and B E A and C 17, of the following wavenumber corresponds to the C-O double bond region on am IR spectru A. 1500-4000 c B. 400-4000 m D. 2100- 2300 c.1600- 1850cm C.400-1500 cm 18. Concentrated alcohols show a absorption in the region of 3200-3600 cm', due to A. sharp, hydrogen bonding B. broad, hydrogen bonding C. sharp, polarity D. broad, polarity 19. Which of the following compounds will show two sharp abscrptions, one at 3300 cms and one a 2150 cm A. I D. IV none of these 20. Which one of the following compounds is cossistent with the following IR spectrums? SDBS: National Institute of Advanced Industrial Science and Technology D. IV E. V A. I 21. ?? Which of the m/z values correspond to the molecular ion for the following compound? A. 18 B. 82 C. 100 D. 102 E. 103

Explanation / Answer

15. D

16. E

17.E

18.B

19.A. Alkyne terminal C-H will show sharp peak at 3300, and C=C stretch at 2150

20.D. the broad peak is for OH, and sharp peak at around 1600 is for C=C peak of alkene

21.D. just find the molecular weight of molecule.

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