Multiple Choice Quiz

Multiple Choice Quiz

Multiple Choice Quiz

1

Not only the molecular ion peak, but all peaks in the mass spectrum of chlorobenzene are accompanied by a smaller peak one mass unit higher. This peak is due to which of the following?

A)

capture of an H atom

B)

presence of a ¹³C

C)

presence of a ³⁶Cl

D)

capture of a proton

2

Infrared spectroscopy provides valuable information about

A)

molecular weight.

B)

melting point.

C)

conjugation.

D)

functional groups.

3

A strong signal at 1700 cm^–1 in an IR spectrum indicates the presence of a(n)

A)

alcohol

B)

ether

C)

carbonyl

D)

amine

4

A strong signal at 3400 cm^–1 in an IR spectrum indicates the presence of a(n)

A)

alcohol

B)

ether

C)

carbonyl

D)

amine

5

What is the exact mass (in atomic mass units: C, 12.0000; H, 1.0078; N, 14.0031; O, 15.9949) of the molecular ion of a compound with molecular formula C₃H₈O?

A)

60.0000

B)

60.0573

C)

60.0624

D)

59.9949

6

Deduce the structure of an unknown compound with molecular formula C₅H₁₂O using information given by its infrared spectrum.

Intensity (peak):	Frequency (cm^–1):
m	3300
m	2900
m	2800
m	1465
m	1450
m	1375

A)

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0072397462/209342/14_6a.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (12.0K)</a>

B)

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0072397462/209342/14_6b.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (11.0K)</a>

C)

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0072397462/209342/14_6c.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (11.0K)</a>

D)

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0072397462/209342/14_6d.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (11.0K)</a>

7

Deduce the structure of an unknown compound with molecular formula C₃H₃Br using information given by an infrared spectrum.

Intensity (peak):	Frequency (cm-1):
m	3300
m-w	2225
m	2800
m	1450
m	1375
s	667

A)

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0072397462/209342/14_7a.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (13.0K)</a>

B)

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0072397462/209342/14_7b.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (11.0K)</a>

C)

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0072397462/209342/14_7c.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (10.0K)</a>

D)

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0072397462/209342/14_7d.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (10.0K)</a>

8

Deduce the structure of an unknown compound with molecular formula C₉H₁₀O using information given by its infrared spectrum.

Intensity (peak):	Frequency (cm^–1):
s	3100
m	2900
m	2800
s	1710
m-w	1600
m-w	1475
m	1465
m	1450
m	1375

A)

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0072397462/209342/14_9.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (13.0K)</a>

B)

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0072397462/209342/14_9b.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (13.0K)</a>

C)

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0072397462/209342/14_9c.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (14.0K)</a>

D)

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0072397462/209342/14_9d.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (15.0K)</a>

9

Deduce the structure of an unknown compound with molecular formula C₅H₈O using information given by its infrared spectrum.

Intensity (peak):	Frequency (cm^–1):
m	3100
m	2800
s	1705
m-w	1640
m	1450
m	1375

A)

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0072397462/209342/14_10a.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (12.0K)</a>

B)

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0072397462/209342/14_10b.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (12.0K)</a>

C)

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0072397462/209342/14_10c.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (12.0K)</a>

D)

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0072397462/209342/14_10d.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (11.0K)</a>

10

Which of the following bonds would be expected to have the highest frequency stretch?

A)

carbon–carbon single bond

B)

carbon–carbon double bond

C)

carbon–carbon triple bond

D)

carbon–bromine single bond

11

Which of the following bonds would be expected to have the lowest frequency stretch?

A)

C–I

B)

C–Br

C)

C–Cl

D)

C–F

12

Which of the following compounds a–d has an IR absorption at 1640 cm^–1?

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0072397462/209342/14_13.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (16.0K)</a>

A)

a

B)

b

C)

c

D)

d

13

Which of the following compounds a–d has an IR absorption at 3300 cm^–1?

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0072397462/209342/14_14.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (17.0K)</a>

A)

a

B)

b

C)

c

D)

d

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