CHEM 219 MODULE 3 IN DEPTH PRACTICE
MATERIAL WITH TESTED QUESTIONS AND
RELIABLE SOLUTIONS
◉ A stereocenter in an organic molecule is typically:
Answer: a carbon atom with tetrahedral geometry that is bonded
to 4 different atoms or groups
◉ molecules possess __________ due to tetrahedral geometry of the
___________ and the unique identity of the 4 atoms or groups
oriented around it
Answer: chirality, stereocenter
◉ the absence of a stereocenter is the reason why certain
molecules are:
Answer: achiral
◉ The presence of a stereocenter in an organic structure is
denotes using an:
Answer: asterisk
◉ A drug given to pregnant women in the late 50s as a treatment
for nausea where one enatiomer was active as a therapeutic and
the other caused severe birth defects
, Answer: Thalidomide
◉ The percent composition of an unknown mixture of
enantiomers can be determined using a device known as ________
Answer: Polarimeter
◉ With polarimetry the rotation of light by individual
enantiomers is always:
Answer: equal but opposite
◉ The measurement of the optical activity of a pure single
enantiomer of a compound gives the value known as the:
Answer: specific rotation
◉ The specific rotation is a:
Answer: unique property of each enantiomer that can be used to
help identify a compound
◉ Enantiomers are
Answer: different compounds that differ in the arrangement of
the groups attached to the stereocenter
◉ There are two enantiomers and they are known as:
Answer: the R enantiomer and the S enantiomer
MATERIAL WITH TESTED QUESTIONS AND
RELIABLE SOLUTIONS
◉ A stereocenter in an organic molecule is typically:
Answer: a carbon atom with tetrahedral geometry that is bonded
to 4 different atoms or groups
◉ molecules possess __________ due to tetrahedral geometry of the
___________ and the unique identity of the 4 atoms or groups
oriented around it
Answer: chirality, stereocenter
◉ the absence of a stereocenter is the reason why certain
molecules are:
Answer: achiral
◉ The presence of a stereocenter in an organic structure is
denotes using an:
Answer: asterisk
◉ A drug given to pregnant women in the late 50s as a treatment
for nausea where one enatiomer was active as a therapeutic and
the other caused severe birth defects
, Answer: Thalidomide
◉ The percent composition of an unknown mixture of
enantiomers can be determined using a device known as ________
Answer: Polarimeter
◉ With polarimetry the rotation of light by individual
enantiomers is always:
Answer: equal but opposite
◉ The measurement of the optical activity of a pure single
enantiomer of a compound gives the value known as the:
Answer: specific rotation
◉ The specific rotation is a:
Answer: unique property of each enantiomer that can be used to
help identify a compound
◉ Enantiomers are
Answer: different compounds that differ in the arrangement of
the groups attached to the stereocenter
◉ There are two enantiomers and they are known as:
Answer: the R enantiomer and the S enantiomer
