WorksheetsInfrared Spectroscopy
Total questions: 12
Worksheet time: 15mins
Name
Class
Date
1.
A molecule absorbs IR at a wavenumber of 1720 cm-1. Which functional group could account for this absorption.
I. aldehydes
II. esters
III. ethers
I. aldehydes
II. esters
III. ethers
a)
I only
b)
I and II
c)
I, II and III
d)
none of the above
2.
What part of the atom or molecule does infrared radiation affect
a)
the nucleus
b)
the electrons
c)
the bonds
d)
the charge
3.
The greater the polarity of a bond the_______________its IR absorption
a)
weaker
b)
stronger
c)
more charged
d)
smaller the wavenumber
4.
Non polar symmetrical molecules
a)
do not absorb IR radiation
b)
absorb IR radiation
c)
absorb the most IR radiation
d)
transmit IR radiation
5.
The fingerprint region is
a)
different for each organic compound
b)
from 600 - 1500 cm-1
c)
both the above
6.
The actual wavelength which is absorbed by any bond can vary.
a)
True
b)
False
7.
Stronger bonds absorb IR at
a)
higher wavenumbers
b)
lower wavenumbers
c)
in the finger print region
d)
600cm-1
8.
Mass of attached atoms affect the absorbance of the bond
a)
True
b)
False
9.
A molecule has a very broadband at 3200cm-1 and a sharp band at 1711cm-1. the molecule is most likely an
a)
amide
b)
ester
c)
alkenol
d)
carboxylic acid
10.
The infrared spectrum of an organic compound is shown.
Which compound produces this spectrum?
a)
butanone
b)
ethanol
c)
pent-2-ene
d)
propanoic acid
11.
Which compound gives this infrared spectrum?
a)
1-bromobutane
b)
butan-1-ol
c)
butanal
d)
butanoic acid
12.
Which of these infrared spectra could represent a carboxylic acid?
a)
b)
c)
d)
100 %
