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Meso Compounds

Meso compound...

Question

Meso compound do not show optical activity because :

A

they do not contain chiral carbon atoms

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B

they have non-super imposable mirror images

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C

they contain plane of symmetry

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D

they do not contain plane of symmetry

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Solution

The correct option is D they contain plane of symmetry
Meso compounds do not show optical activity due to the presence of plane of symmetry due to which optical activity cancels out.

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Meso compounds do not show optical activity because they

Q. An organic compound having a carbon attached to four different groups is optically active. But, is the opposite also true? That is, do all optically active organic compounds have chiral carbons? Not necessarily. Presence or absence of chiral centre is not the sufficient criterion for optical activity. The ultimate criterion is the presence or absence of either plane or centre of symmetry. Two compounds which are non-superimposable mirror images of each other are called enantiomers. If a compound contains more than one chiral carbon, new words are required to describe the relationship between various stereoisomers of the compounds. Those words are diastereomers and mesomers.

Optically active compounds among the following is :

Q. An organic compound having a carbon attached to four different groups is optically active. But, is the opposite also true? That is, do all optically active organic compounds have chiral carbons? Not necessarily. Presence or absence of chiral center is not the sufficient criterion for optical activity. The ultimate criterion is presence or absence of either plane or center of symmetry. Two compounds which are non-superimposable mirror images of each other are called enantiomers. If a compound contains more than one chiral carbon, new words are required to describe the relationship between various stereoisomers of the compounds. Those words are diastereomers and mesomers.
Optically active compounds among the following is/are
(A)

C H_{3} - C H = C = C H_{2}

C H_{3} - C H = C = C H - C H_{3}

Q. Assertion :Complexes containing three bidentate ligands do not show optical activity. Reason: Octahedral complex

[C o (N H_{3})_{4} C l_{2}] C l

shows geometrical isomerism.

Q. An organic compound having a carbon attached to four different groups is optically active. But, is the opposite also true? That is, do all optically active organic compounds have chiral carbons? Not necessarily. Presence or absence of chiral centre is not the sufficient criterion for optical activity. The ultimate criterion is the presence or absence of either plane or centre of symmetry. Two compounds which are non-superimposable mirror images of each other are called enantiomers. If a compound contains more than one chiral carbon, new words are required to describe the relationship between various stereo isomers of the compounds. Those words are diastereomers and mesomers.
The optical rotation of a solution of pure natural camphor is found to be

+ {5.76}^{o}

under the following conditions: concentration

= 0.13 g / m l

, length of polarimeter

=

1dm, wavelength

=

T = 25^{o}

C. The specific rotation of camphor is

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