Question

determine unknown compound

Melting point range 126-130 celcius

Soluble in ether and water

Has nitrogen

No halogens

No sulfur

Possibly contains acid, alcohol, aldehyde, amine, anhydride, ester,ketone nitrile, phenol.

IR spectrum:

possible compounds (pink list):

(this was all the info given!)

103 100 3710 7Bon-1. 95 45%T 368062cm-1. 95.00%T 90- 85- 1, 88.30%T 261A)cm-1, 88.52%T 179.98cm 1.85 83 71%T 11 22.39am 114282cm. 5%T T 810.17 6.88%T 104.02cm-1, 84,p%T 2922 79on-1, 82.48%T 323ST 80%T 1 1. 8052%T 3363 20cm-1, 78.85%T 38 75 2973 020m -1, 80.55%T 73.79%T 703 440 70 1654 660m -T, 72.38%T 769.13cm-1.73 1395 750m-1, 70.50%T 1622 96cr-1, 6941NT- 1577 ,440m, 1,7 1.45%T 1015非m-1 , 7131NT 65- 683, 150n 1, 02.34%81 1 80 ,04 12%T ,63.73%. 60- 1054 60 1033 Olyn, 1, 53.4 -1, 51.07%т 92c 51 4000 3500 3000 2500 2000 1000 1500 600 cm-1 Analyst 551 Sample 551 By Analyst Date Thursday, May 09 2019 Compound 1-decene 2,4,6-trinitrobenzenesullonic acid 3,3-dinitrobenzoic acid 4-bromoacetanilide 4-bromoanisole 4-chloro-3,5-xylenol 4-chlorobenzoic acid 4-chlorotoluene 4-dimethylaminobenzaldehy do -mcthylbenzophenone 4-nitrobenzoic acid acetanilide biphenyl mobenzenc bromophenol bromopropionic acid 2-bromo-2-methyl propane tane chlorobenzene chlorohydroquinone cinnalmyl alcobol decane diiodomethane decanoic acid 2-dichloroethanc diethylamine cthvl iodide hexamethylene teramine imidazole о- m-xylene 37 methyl isobutyl ketone 38 39 N-bromosuccinamide nitrobenzene 40 41 succinic acid succinimide 42 43 sulfanilamide sulfanilic acid t-butyl chloride 45 46 thioacetamide 7 4 thiourea 48 toluene 472- naph tho mehylphenc cut 5

Answer 1

The unknown compound is benzamide (PhCONH2) having melting point in the range 127 to 130 °C. In this molecule no halogen or sulfur atoms present. Molecular formula and mass are C7H7NO and 121.14 g/mol respectively. It is soluble in ether and water.

It is a primary amide compound, hence C=O, -NH2 are present. Here the

1. amide carbonyl stretching frequency is at 1654 cm-1

2. two N-H stretching frequency at 3363 and 3164 cm-1 (primary amides produce two N-H stretch absorption: 3400-3250).

3. N-H bending is at 1577 cm-1 (amide N-H bending is at the range 1550-1640 cm-1).