2) Which of the following is a bridged blcyclic alkane? A) cis- decal in B) bicy

Question

2) Which of the following is a bridged blcyclic alkane? A) cis- decal in B) bicyclo[4.1.0jheptane C) bicyclol2 2 1]heptane D) bicyclo[3 2.0]heptane E) none of the above 3) What term describes the structural relationship between (2R.3R 45)-2.3.4-trichloroheptane and (2R,3R,4R)-2,3,4-trichloroheptane? A) not isomers conformers C)diastereomers enantiomers E) constitutional isomers 4) Which of the following statements correctly pertains to a pair of enantiomers? A) They have the same melting point, but they have different boiling polnts B) They rotate the plane of polarized light by differing amounts and in opposite directions. C) They rotate the plane of polarized light by exactly the same amount and in opposite directions. D) They rotate the plane of polarized light by differing amounts and in the same direction. E) The have different melting points 5) Does this molecule have a mirror plane? If so, represent where the plane would be with a dashed line. X 6) Provide an acceptable name for the compound below hexane

Explanation / Answer

2)

A) Cis decaline is a fused ring structure, therefore, it does not have bridge structure.
B) bicyclo[4.1.0]heptane is also fused structure. Hence this option is not bridge structure.
C) bicyclo[2.2.1]hepaten contains a bridged carbon. hence, this option is correct.
D) bicyclo[3.2.0]heptane is also fused structure. Hence this option is not correct.

Hence, the answer is: C (bicyclo[2.2.1]heptane

3) (2R,3R,4S)-2,3,4-trichloroheptane and (2R,3R,4R)-2,3,4-trichloroheptane are only differed in the configuration
at carbon 4. Therefore, these two molecules are enantiomer.
Hence, the answer is: D (enantiomers)

4) Enantiomer only differs in the .rotation of plane polarized light. they rotate the plane polarised light by exactly same amount but in opposite direction.
Hence, the option "C" is correct.

5) Yes. this molecule contains an internal plane symmetry, which you indicated correctly.

6) The name of the structure is: bicyclo[2.1.1]hexane

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