Question

Instrumentation Workshop Part 1: IR QI. (4 x 2 point) Match the proper compound with the appropriate set of IR bands, provide structure, and assign the IR bands Compounds: Dodecane, 1-decene, 1-hexyne, 1,2-dimethylbenzene Compound name Structure Sets of signals (in cm) 3311,2961, 2119 c-H N-H C-lt |-hexyne Assignment 333/cml: Amine NFH 2961cm1; Alkanes (-it 2/19 cm'l Al keres CEC- b 3020, 2940, 1606, 1495 1,2-dinthyl- buizene 3020cm Alpes-C- 2940cnit: Alkane C-H 1606 cm 1: Amidle N-H 1495cmt: Benzindo c 3049, 2951, 1642 1-decore |3049cm i Alkenes tc-t. 29510ml: Al have t-it. 1642 chil: 2924, 1467 c-H dalecane

Answer 1

C. 1642 represents the c=c stretching as it ranges from 1640 to 1680

That is CH₂=CH

D. 2924 represents alkanes (-CH₃) as it represents C-H stretching and alkanes lies in range 2850-3000 cm^-1.

1467 represents methylene group (-CH₂) as strong peak around 1450 cm^-1 represents methylene group.