11. Which bond shows a strong, sharp absorption in the IR spectrum at-3000 cm1?

Question

11. Which bond shows a strong, sharp absorption in the IR spectrum at-3000 cm1? O-H B N-H D C-H 12. If a compound CsH O shows a strong absorption at 1725 em in its IR spectrum, what functional group does it have? acid chloride B alkene C ketone D alkyne E phenol 13. The IR spectrum of a compound with the formula CH O shows a strong absorption at 1230 cm1, no absorption in the 1750-1650 cm" region, and no absorption above 3000 cm-. What functional group does it have? A alcohol amine c D aldehyde ketone ether E 14. What is the region in the infrared spectrum between 1400 and 400 cm called? A B C D E the carbonyl group region the fingerprint region the hydroxyl group region the C-H stretch region None of the above

Explanation / Answer

(11) D: C-H bond shows a sharp and strong absorption in IR spectrum at 3000 cm-1.

(12) C : Ketone functional group shows a IR signal at 1725 cm-1.

(13) E : It has ether functional group.

(14) B : It is called fingerprint region.

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