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Select the incorrect statement from the following option.
- a)Racemic modification is an equimolar mixture of dextrorotatory and levorotatory isomers
- b)Meso compounds contain more than one chiral carbon centre
- c)Meso compounds are externally compensated
- d)Racemic mixture is designated as dl-pair
Correct answer is option 'C'. Can you explain this answer?
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Select the incorrect statement from the following option.a)Racemic mod...
Meso compounds are internally compensated form whereas racemic mixtures are externally compensated modification. All the other options are correct.
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Select the incorrect statement from the following option.a)Racemic mod...
Meso compounds are externally compensated.
Explanation:
Racemic modification is an equimolar mixture of dextrorotatory and levorotatory isomers:
- This statement is correct. A racemic mixture contains equal amounts of two enantiomers (mirror images) - the dextrorotatory (d) and levorotatory (l) isomers. It is optically inactive as the rotations of the two isomers cancel each other out.
Meso compounds contain more than one chiral carbon center:
- This statement is correct. Meso compounds are optically active compounds that have multiple chiral carbon centers but do not exhibit optical activity. This is because they possess an internal plane of symmetry which allows the rotations of the chiral centers to cancel each other out, resulting in zero net optical rotation.
Racemic mixture is designated as dl-pair:
- This statement is correct. In organic chemistry, racemic mixtures are designated as dl-pairs. The "d" represents the dextrorotatory isomer, and the "l" represents the levorotatory isomer. This naming convention helps to distinguish between the two enantiomers in the racemic mixture.
Meso compounds are externally compensated:
- This statement is incorrect. Meso compounds are internally compensated, not externally compensated. As mentioned earlier, meso compounds possess an internal plane of symmetry, which allows for the cancellation of rotations of the chiral centers within the molecule. This internal compensation results in the absence of optical activity in meso compounds.
In conclusion, option 'C' is the incorrect statement. Meso compounds are internally compensated, not externally compensated.
Explanation:
Racemic modification is an equimolar mixture of dextrorotatory and levorotatory isomers:
- This statement is correct. A racemic mixture contains equal amounts of two enantiomers (mirror images) - the dextrorotatory (d) and levorotatory (l) isomers. It is optically inactive as the rotations of the two isomers cancel each other out.
Meso compounds contain more than one chiral carbon center:
- This statement is correct. Meso compounds are optically active compounds that have multiple chiral carbon centers but do not exhibit optical activity. This is because they possess an internal plane of symmetry which allows the rotations of the chiral centers to cancel each other out, resulting in zero net optical rotation.
Racemic mixture is designated as dl-pair:
- This statement is correct. In organic chemistry, racemic mixtures are designated as dl-pairs. The "d" represents the dextrorotatory isomer, and the "l" represents the levorotatory isomer. This naming convention helps to distinguish between the two enantiomers in the racemic mixture.
Meso compounds are externally compensated:
- This statement is incorrect. Meso compounds are internally compensated, not externally compensated. As mentioned earlier, meso compounds possess an internal plane of symmetry, which allows for the cancellation of rotations of the chiral centers within the molecule. This internal compensation results in the absence of optical activity in meso compounds.
In conclusion, option 'C' is the incorrect statement. Meso compounds are internally compensated, not externally compensated.
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Select the incorrect statement from the following option.a)Racemic modification is an equimolar mixture of dextrorotatory and levorotatory isomersb)Meso compounds contain more than one chiral carbon centrec)Meso compounds are externally compensatedd)Racemic mixture is designated as dl-pairCorrect answer is option 'C'. Can you explain this answer?
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