Organic Chemistry
Isomerism shown by 2,3-dichlorobutane is :
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Single Choice
Which of the following has two sterioisomers?
ANone of these
BOnly $$I$$
Correct Answer
COnly $$III$$
D$$I$$ and $$III$$
Solution
Only I has two sterioisomers. This includes a pair of enantiomers. Geometrical isomerism is not possible as two same atoms (H atoms) are attached to doubly bonded C atoms.
No stereoisomers are possible for II as two same groups (methyl groups) are attached to N atom.
A rapid umbrella type inversion rapidly converts the structure III to its enantiomer; hence the two emantiomers are not separable.
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