Question

I’m not really understanding the last page, please help! Other pages and information provided. (:

Experiment 330 Introduction to Infrared Spectroscopy Data Sheet Section Name Prominent Absorption Bands (cm-) Structure Substance tetrafluoride carbon rhorde71 H-H 3013 130 methane НН H- 2uS 1410 30 ethane CH 301S 2 501400 isobutene acetylene H CEC 3314 325 1245 135 | CH3-CE C-H | 3379 | 2014S | 2146 | 1445 | 1255 | 1032 propyne c14-c=N | 2255| 1034 |974 |775 |44 ↓ acetonitrileCl,c- CEN 31S0 15I0 water ammonia 30SI 2S00 7 14 1135 3S formaldehyde 91 %Transmittance 3407.04 2916.14 2848.26 1472.23 1462.53 730.23 719.02 426 24 Experiment 330 Introduction to Infrared Spectroscopy Lab Report Section Name 1 For each known sulbstance, enter the stringteuengy of ble bond in the molecule Uhe pencil) Stretching Frequency (cm) Bond Substance carbon tetrafluoride carbon tetrachloride methane ethane isobutene acetylene propyne trichloro- acetonitrile water ammonia formaldehyde 93

Answer 1

Carbon tetrafluoride (In the spectra of this compound only C-F bond will be present)	1400-1000
Carbon tetrachloride (only C-Cl bond absorption will be seen )	850-550
Methane (C-H bond strech and O-H bond if water is present)	3550-3200 (o-H) 1320 around(C-H)
Ethane (3 peaks in standard charts)	3000-2850(C-H Stretch in alkanes) 1465 (C-H bending peak in Alkanes)
.Water(3 peaks)	3800-3000 1700-1500 900-700 (Finger print region)

Referring Standard IR data brings more understanding about identification of functional group in each spectra. The IR spectra is dividen into two regions :

• Functional group Region
• Fingerprint Region (100-500 cm^-1) This region is not very useful as it is the interaction between the molecules in a compound and it doesn't help us