PORTAGE CHEM 219
MODULE 3 EXAM QUESTIONS AND
CORRECT ANSWERS
LATEST UPDATE 2026/2027 .
, 1. False, they are achiral ✔✔ ANSW True or False mesocompunds are chiral
2. Meso compounds typically have an internal mirror plane of symmetry within their molecular structure.
In this molecule, the presence of the two chlorine atoms allows for a plane of symmetry to be created when the
chlorines are present on the same side of the carbon chain when written vertically.
This internal plane of symmetry allows for this particular stereoisomer to be superimposable on its own mirror image
(after a rotation of 180 degrees). ✔✔ ANSW What makes a meso compound possible?
3. Emil Fische; Fischer projections ✔✔ ANSW A method for representing the structures of chiral molecules in 2D was developed by German
Chemist . These formula representations are known as .
4. -the carbon representing the stereocenter is usually omitted and is repre-sented instead by the crossing
point of horizontal and vertical lines.
-Horizontal bonds are equivalent to "wedge bonds" (from wedge-and-dash notation). These bonds represent
things that project towards the reader (out of the plane of the paper).
-Vertical lines are equivalent to "dash bonds" and represent things that project away from the reader (behind the plane of
the paper). ✔✔ ANSW To draw and understand Fischer projections correctly requires an understanding of and adherence to several conventions. What
are they?
5. Wedge and Dash vs Fischer projection of (2R,3R)-2-bromo-3-chlorobutane ✔✔ ANSW
6. A stereocenter ✔✔ ANSW What does the circled part represent?
7. Horizontal bonds are equivalent to "wedge bonds" (from wedge-and-dash notation). These bonds represent
things that project towards the reader (out of the plane of the paper). ✔✔ ANSW What do the horizontal lines represent
8. Vertical lines are equivalent to "dash bonds" and represent things that project away from the reader (behind the
plane of the paper). ✔✔ ANSW What do the vertical lines represent
MODULE 3 EXAM QUESTIONS AND
CORRECT ANSWERS
LATEST UPDATE 2026/2027 .
, 1. False, they are achiral ✔✔ ANSW True or False mesocompunds are chiral
2. Meso compounds typically have an internal mirror plane of symmetry within their molecular structure.
In this molecule, the presence of the two chlorine atoms allows for a plane of symmetry to be created when the
chlorines are present on the same side of the carbon chain when written vertically.
This internal plane of symmetry allows for this particular stereoisomer to be superimposable on its own mirror image
(after a rotation of 180 degrees). ✔✔ ANSW What makes a meso compound possible?
3. Emil Fische; Fischer projections ✔✔ ANSW A method for representing the structures of chiral molecules in 2D was developed by German
Chemist . These formula representations are known as .
4. -the carbon representing the stereocenter is usually omitted and is repre-sented instead by the crossing
point of horizontal and vertical lines.
-Horizontal bonds are equivalent to "wedge bonds" (from wedge-and-dash notation). These bonds represent
things that project towards the reader (out of the plane of the paper).
-Vertical lines are equivalent to "dash bonds" and represent things that project away from the reader (behind the plane of
the paper). ✔✔ ANSW To draw and understand Fischer projections correctly requires an understanding of and adherence to several conventions. What
are they?
5. Wedge and Dash vs Fischer projection of (2R,3R)-2-bromo-3-chlorobutane ✔✔ ANSW
6. A stereocenter ✔✔ ANSW What does the circled part represent?
7. Horizontal bonds are equivalent to "wedge bonds" (from wedge-and-dash notation). These bonds represent
things that project towards the reader (out of the plane of the paper). ✔✔ ANSW What do the horizontal lines represent
8. Vertical lines are equivalent to "dash bonds" and represent things that project away from the reader (behind the
plane of the paper). ✔✔ ANSW What do the vertical lines represent
