TABLE Characteristic IR Absorptions of Some Functional Groups Functional group A
ID: 574276 • Letter: T
Question
TABLE Characteristic IR Absorptions of Some Functional Groups Functional group Absorption (cm-1) Intensity | Functional group Absorption (cm-1) Intensity Alkane CH 2850-2960 Medium 3300–3500 1030-1230 Medium Medium 3020–3100 1640-1680 Medium Medium Amine N-H C-N Carbonyl compound C=0 Carboxylic acid O-H Nitrile C=N Nitro 1670-1780 Strong 3300 Strong Medium 2100–2260 2500–3100 Alkene =C-H C=C Alkyne =C-H C=C Alkyl halide C-CI C-Br Alcohol 0-H C-0 Strong, broad 2210-2260 Medium 600-800 500-600 Strong Strong NO2 1540 Strong 3400–3650 1050-1150 Strong, broad Strong Arene . Aromatic ring 3030 1660-2000 1450-1600 Weak Weak Medium At what approximate positions might this compound show IR absorptions? Consult the table given above; there must be an exact match of groups with the absorptions. There are occasional overlaps between absorptions in the table, be sure that the group is actually present in the molecule. Esters and alcohols both show similar C-0 stretching vibrations. Enter your choices as an alphabetized string of letters, with no spaces.Explanation / Answer
The IR spectrum will have following peaks
Due To OH stretching : 3400-3640
Due to C-O stretching : 1050-1150
Aromatic ring : 1450-1600
Due to CN stretching :2210-2260 (nitrile)
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