List the IR absorption peak that would greatly identify diethylamine. Place the

Question

List the IR absorption peak that would greatly identify diethylamine. Place the following carbonyl compounds in order of decreasing wavenumber. Pentanal Butanoyl chloride Propanolic acid Ethyl butanoate Describe the difference between a stretching vibration and bending vibration in terms of the compound bond A nitrogen-containing compound shows no absorption band at 34000cm^1 and no absorption bands between - 1700cm^-1 and -1600cm^-1. What class of compound is it? An oxygen-containing compound shows an absorption band at - 1700cm^1 and no absorption bands at -3300cm^-1 -2700cm^2, or -1100cm^1. What class of compound is it?

Explanation / Answer

Q1) Ethyl amine can be identified by the charaacteistic peaks 3200-3500 broad N-Hstrt, 1600,weak N-H def. 2800-2900 C-H str. and 1500,1400 C-H def. bands.

Q2) butanoylchloride an acid chloride has highest wavenumber 1790-1800

ethyl butanoate , an ester next higher value 1750 around

propannoic acid , an acid 1710-1720

propanal , an aldehyde 1700-1710

Q3)

A stretching vibration is the due to the stretching of a bond like a rubber band (to and fro ) movement of a rubber band.

A bending vibration is a scissoring like movement (in-plane ) or rocking movement of the bonds.

Q4) a nitrogen compound which does not show the characteristic N-h( 3200, 1600) and -NO2 (3400, 1600,1400) can be a nitrile(CN) which shows a characteristic band at 2200.

Q5) an oxygen compound which absorbs around 1700 could be a carbonyl group.

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