Question

[References [Review Toples] Determine the class of the compound, which contains only carbon and hydrogen, and exhibits the infrared spectrum below. Possible compound classes are: alkane, alkene, alkyne, aromatic, alcohol, amine, aldehyde ketone, carboxylic acid, acid chloride, ester, amide The compound is a(n) (Use your cursor to read the IR frequency scale.) Flash Installation and Troubleshooting Infrared spectra provided courtesy of Thermo Electron Corp. 110% Transmittance Wavenumber: ** 4000 3500 3000 2500 2000 1500 1000 450 Wavenumber (CI

Answer 1

sp-С- sp” г-н c-c (Alkane) sp El-H --CEC- (-0. а) 25 50 – 1460 ь) зою - 3 100 с) 16чо - bso а) . 3300 о) 2106 – 20 с. л koo - оо ш" ) . 50 - 600 ш" » 3400 - 36 so us ј). 1050 —?) - 3) 1450 - 600 сая к 3300 - 39 со ис" 4. 1030 - w. 6НЭo Lo" 11 | 1111111111 - — eep C-д, -OH CHydrogen sand free c=c (Anomatic) -NH Camivel -OH (canboxylic And] 6. Мемо * - - СЕ

First five values are vary useful to solve this problem

Here given that compound have only carbon and hydrogen. So the possible compounds are alkane, alkene, alkyne and aromatic ( example benzene).

The peak at ~3100 cm-1 indicates the presence of =C-H ( Alkene C-H).

So the possible compound is alkene or aromatic

Now check C=C absorption.

Here the peak present at 1500 cm-1

Aromatic C=C shows peak at1450-1600 cm-1

Where as alkenes shows peak at1640-1680 cm-1

Hence this compound is Aromatic