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Keto-enol Tautomerism

The compound ...

Question

The compound $l - (N - e t h y l - N - m e t h y l) - p r o p a n a m i n e$ forms non-superimposable mirror images.
But this compound does not show optical activity because of the:

A

Absence of a chiral N atom

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B

Presence of chiral N atom

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C

Presence of lone pair on N atom

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D

Rapid flipping of one form into the other

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Solution

The correct option is D Rapid flipping of one form into the other
Due to N-inversion or rapid flipping of one form into

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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. The compound if contains an even number 'n' of chiral carbons, but the molecule can be divided into two equal and si,ilar halves , then how many optical active form it will have :

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Keto-enol Tautomerism

Standard XII Chemistry

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