Which of the following species has a characteristic absorption at 3300 cm^-1 in
ID: 899950 • Letter: W
Question
Which of the following species has a characteristic absorption at 3300 cm^-1 in its IR spectrum? (CH_3)2CHCCH) (CH_3)2CHN(CH_3)2 CH_3)2CHCCCH_3 (CH_3)2CHCH-CH_2 (CH_3)2CHCC>2CH_3 Which of the following functional groups will exhibit nfi IR absorption at 1630 - 1780 cm I fir at 3200 -3550 cm-1? an alcohol an amide a ketone an aldehyde an ether In the infrared spectrum, a compound of formula C_4H8O gave an absorption band at 1720 cm 1, but no bands at 2720 - 2830 and 3400 cm 1. What is the compound? 2-butanone butanal cis-2-butcnol trans-2-butcnol l-butenol Give the C-H absorption band for a sp carbon. 2700 cm-1 2900 cm-1 3100 cm-1 3300 cm-1 3500 cm-1Explanation / Answer
10) absorption at 3300 cm-1 indicates the present of O-H bond or N-H bond or C-H in alkynes
Among the given compounds only compound A) has C-H bond which is attached to alkyne carbon.
Hence option A) is correct
11) Given information says that there is no C=O, no O-H bonds and no N-H bonds.
Among the given compounds alcohol has O-H bond, amide has both C=O and N-H bonds, ketone and aldehyde have C=O bond. Therefore ether doest not have either O-H or C=O bonds.
Hence answer is D) an ether
12) No band around 3400 indicates the absence of O-H that means it is not an alcohol. Absence of peaks around 2720-2830 indicates it is not an aldehyde. Hence the compound is ketone.
Answer is A) 2-butanone.
13) absorption C-H band for a sp carbon is 3300 cm-1
answer is D) 3300 cm-1
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