Question

multiple answer 2 points
which of the following statements is (are) true for the compound (3r, 4r)-3,4-dimethylhexane?
this compound is achiral.
this compound is a diastereomer of (3r, 4s)-3,4-dimethylhexane.
the enantiomer of this compound is (3s, 4s)-3,4-dimethylhexane.
this compound is chiral.
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Explanation:

• Chirality: A compound is chiral if it has no plane of symmetry. (3R,4R)-3,4 - dimethylhexane has no plane of symmetry, so it is chiral. An achiral compound has a plane of symmetry, which this compound does not have.
• Diastereomers: Diastereomers are stereoisomers that are not mirror images. (3R,4R)-3,4 - dimethylhexane and (3R,4S)-3,4 - dimethylhexane are not mirror images (since at least one - but not all - chiral centers have opposite configurations), so they are diastereomers.
• Enantiomers: Enantiomers are non - superimposable mirror images. The mirror image of (3R,4R)-3,4 - dimethylhexane is (3S,4S)-3,4 - dimethylhexane (by inverting the configuration at all chiral centers).

Answer:

B. This compound is a diastereomer of (3R,4S)-3,4 - dimethylhexane., C. The enantiomer of this compound is (3S,4S)-3,4 - dimethylhexane., D. This compound is chiral.