Ochem Lab Exam Midterm Questions With Complete
Solutions
A nucleus that is shielded will appear at a higher ppm
(downfield) than a nucleus that is de-shielded Correct Answers
False
A quartet and a doublet of doublets both represent hydrogens
that are in the same environment. Correct Answers False
A signal on a NMR spectrum is a singlet. What could this mean?
Correct Answers the hydrogen represents an alcohol
there are no hydrogens adjacent to the hydrogen represented by
the signal
A signal on a NMR spectrum is split into a triplet. What does
this mean? Correct Answers the hydrogens represented by that
signal are adjacent to 2 equivalent hydrogens
At what point in the procedure is hexanol synthesized? Correct
Answers after allowing time for the hydrogen peroxide and
sodium hydroxide to react
During the extraction and separation of hexanol, will the organic
layer be on top or bottom in the separatory funnel (compared to
the aqueous solution)? Correct Answers top
Ferrocene and fluorenone will be separated based on differences
in: Correct Answers both solubility and polarity
, How do you know when reflux has begun? Correct Answers
when liquid starts dripping from the condenser
How do you know when to stop adding magnesium sulfate for
drying an organic solution? Correct Answers when the
magnesium sulfate no longer clumps
when there is a snow-globe affect
How does the mobile phase move in TLC? Correct Answers
capillary action
How many signals would you predict to see in a NMR spectrum
of bromocyclohexane? Correct Answers 4
How many signals would you predict to see in a NMR spectrum
of diethyl ether? Correct Answers 2
How much isopentyl alcohol (in mL) is 150 mmol? (This is the
starting volume of isopentyl alcohol). Correct Answers 16.2 mL
In TLC, stationary and mobile phases are not necessary. Correct
Answers False
Magnesium sulfate clumps up when exposed to water. Correct
Answers True
Markovnikov's rule follows the same principles as carbocation
stability. Correct Answers true
Solutions
A nucleus that is shielded will appear at a higher ppm
(downfield) than a nucleus that is de-shielded Correct Answers
False
A quartet and a doublet of doublets both represent hydrogens
that are in the same environment. Correct Answers False
A signal on a NMR spectrum is a singlet. What could this mean?
Correct Answers the hydrogen represents an alcohol
there are no hydrogens adjacent to the hydrogen represented by
the signal
A signal on a NMR spectrum is split into a triplet. What does
this mean? Correct Answers the hydrogens represented by that
signal are adjacent to 2 equivalent hydrogens
At what point in the procedure is hexanol synthesized? Correct
Answers after allowing time for the hydrogen peroxide and
sodium hydroxide to react
During the extraction and separation of hexanol, will the organic
layer be on top or bottom in the separatory funnel (compared to
the aqueous solution)? Correct Answers top
Ferrocene and fluorenone will be separated based on differences
in: Correct Answers both solubility and polarity
, How do you know when reflux has begun? Correct Answers
when liquid starts dripping from the condenser
How do you know when to stop adding magnesium sulfate for
drying an organic solution? Correct Answers when the
magnesium sulfate no longer clumps
when there is a snow-globe affect
How does the mobile phase move in TLC? Correct Answers
capillary action
How many signals would you predict to see in a NMR spectrum
of bromocyclohexane? Correct Answers 4
How many signals would you predict to see in a NMR spectrum
of diethyl ether? Correct Answers 2
How much isopentyl alcohol (in mL) is 150 mmol? (This is the
starting volume of isopentyl alcohol). Correct Answers 16.2 mL
In TLC, stationary and mobile phases are not necessary. Correct
Answers False
Magnesium sulfate clumps up when exposed to water. Correct
Answers True
Markovnikov's rule follows the same principles as carbocation
stability. Correct Answers true
