Question

Label the IR for the derivatives of carboxylic acids below. (Frequency and stretch type)
Derivatives of carboxylic acids IR spectra: Benzamide: 1577.21 1142.26 1001.05 847.47 80 I 3363.07 3165.28 1622.83 1448/55 1297.58 1179.42 1024.80 809.60 702.97 1654.71 || 1396.09 957.79 682.50 1121742.61 918.11 0.0 4000.0 3000 2000 1500 1000 650.0 cm-1 Benzoic acid: 1678.181 1496.48! 1288.24 1 AN 703.72 2828.62 2559.92 18882.54 145326:20 V 10720233 1170137.50 026.33 803.85 1 1323.52 931.22 683.12 665.74 OH 0.0 4000.0 3000 2000 1500 1000 650.0

Answer 1

DATE: / PAGE No 20 Benzoic acid :- C-ot =c=0 —— о grоuр арреан іn thе дами 4 160 – 1730 С, but conjugation with c=6 of phenye ling moves the absorption at lower frequency O-H strech ý broad and occurs at 3400-2400 un and often overlaps the C-H absorption c-o strech occurs in the range 1320-1210 cm c=c absorption at 1600 - 1660 em but conjugation lowers the frequency and now it appears in the range of 1575 to 15 35 cm AMMMM olo OM conjugated G H akomotic се с 4000 3600 3200 2800 2400 2000 1800 1000 wave numbet (cm-1) 1400 1200 06 900 Methyl benzoate C-H (SP3) streching ;c=0 group g appear but conjugation and lower its frequency in the range of 2840-3000 cm in the range of 1700- 17300 inductive effect donating

Y DATE: / PAGE No 20 og c-o strech appear near to 1300-1000cm and broad band at 3400 cm absence. C-H strech (SP²) appear at 3000 - 3090cm Aromatic c=6 appear near to 1400-1500 cm movimma Anah C- conjugate Sp3 C-H Veo-Lomastics CC Stretch 5610 3200 2800 2400 2700 800 1600 14uo 12 ivov po 600 wave number com) | 3 Benzamide 3 orang czo strech occur at near 1680 - 16.30 cm Primary NH₂ give two peak near to 3350 - 3180 cant c=c appear at 1400-1450 cm N-H N-H Yooo 1000 200 600 3000 2000 1600 1400 - 12000 wave number cmt