Chapter 5 - Stereochemistry at Tetrahedral Centers (McMurry) Questions With Explanations Of Answers.
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Course
MCMURRY
Institution
MCMURRY
Our left and right hands are not identical to each other, rather, they are... - correct answer mirror images.
Handedness is important in organic and biological chemistry, where it arises primarily as a consequence of the tetrahedral stereochemistry of... - co...
Chapter 5 - Stereochemistry at
Tetrahedral Centers (McMurry)
Our left and right hands are not identical to each other, rather, they are... - correct answer
mirror images.
Handedness is important in organic and biological chemistry, where it arises primarily as a consequence
of the tetrahedral stereochemistry of... - correct answer sp3-hybridized carbon
atoms.
(5.1 Enantiomers and the Tetrahedral Carbon) - correct answer
Molecules that are not identical to their mirror images are kinds of stereoisomers called... - correct
answer enantiomers (from Greek "enantio-" meaning "opposite", and "-mer"
denoting related kinds of molecules).
Enantiomers result whenever a tetrahedral carbon is bonded to... - correct answer
four different substituents (one need not be H).
Lactic acid exists as a pair of enantiomers that are called... - correct answer (+)-lactic
acid & (-)-lactic acid.
Both enantiomers of lactic acid are found in sour milk, but only the (+) enantiomer occurs in... - correct
answer muscle tissue.
Regardless of how the molecules are oriented, enantiomers are never... - correct answer
superimposable. (meaning, able to be placed over another)
(5.2 The Reason for Handedness in Molecules: Chirality) - correct answer
, A molecule that is not identical to its mirror image is considered to be... - correct answer
chiral. (from Greek "chir-" meaning "hand" and "-al" denoting to "pertaining to")
Chiral molecules and their enantiomers are never... - correct answer
superimposable.
A molecule is not chiral if it has a... - correct answer plane of symmetry. (plane that
cuts through the middle of a molecule to give equal halves)
A molecule that has a plane of symmetry in any conformation must be identical to its mirror image and
hence must be... - correct answer achiral.
Propanoic acid, CH3CH2CO2H, has a plane of symmetry and is thus... - correct answer
achiral.
Lactic acid, CH3CH(OH)CO2H, has no plane of symmetry and is thus... - correct answer
chiral. (with two enantiomers)
The cause of chirality is due to the presence of a tetrahedral carbon atom bonded to four different
groups—the carbon is known as... - correct answer the "chirality center".
The terms: stereocenter, asymmetric center, and stereogenic center all refer to... - correct answer
chirality centers.
Carbons in —CH2—, —CH3, C=O, C=C, and C(triple bond)C groups can not be chirality centers, because...
- correct answer they cannot be bonded to four different substituents.
A substituted carbon atom in a cycloalkane ring can be a chirality center if... - correct answer
the two paths along the ring, in opposite directions, are different.
Carbons of a benzene ring cannot be chirality centers because they have... - correct answer
a plane of symmetry.
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