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The dihedral angle between the two methy...

The dihedral angle between the two methyl groups in gauche conformation of n-butane is

A

`120^@`

B

`60^@`

C

`180^@`

D

`0^@`

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Verified by Experts

The correct Answer is:
B

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Stereoisomers, which can be interconverted simply by rotation about sigma bonds, are conformational isomers while those, which can be converted only by breaking and remaking of bonds and not simply by rotation, are called configurational isomers. The angle between C-C and C – H bonds on adjacent carbon atoms in any conformation is called dihedral angle. The cyclic compounds most commonly found in nature containing six membered rings can exist in a conformation that is almost completely free of strain. The most stable conformation of cyclohexane is chair form. According to Bayer strain theory, the greater deviation from the normal tetrahedral angle, greater is the angle strain or torsional strain and hence lesser is the stability of the cycloalkane. Dihedral angle between two methyl groups of n-butane in the gauche and anti forms are :

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AAKASH SERIES-ISOMERISM -PRACTICE SHEET (EXERCISE-II (LEVEL-I) STRAIGHT OBJECTIVE TYPE QUESTIONS)
  1. The dihedral angle between the two methyl groups in gauche conformatio...

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  2. The dihedral angle between the two methyl groups in anti conformation ...

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  3. Which of the following is the energy profile diagram for n-butane abou...

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  4. Which points on the potential energy diagram represent the eclipsed co...

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  5. Consider the following conformations of 3-Aminopropanal, amongst the g...

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  6. The most stable conformation of ethylene glycol is

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  7. Flagpole interaction is present in

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  8. Which of the following is associated with Torsional strain ?

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  9. Among the structure shown below, which has lowest potential energy?

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  10. Increasing order of stability among the three main conformation (i.e. ...

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  11. In which of the following has minimum torsional strain and minimum Van...

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  12. Which of the following pairs of compounds are geometrical isomers

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  13. The cause of cis-trans isomerism is

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  14. Which of the following compounds exhibits geometrical isomerism?

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  15. Which of the following is classified as Z and trans-isomer?

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  16. Geometrical isomerism results because molecules has :

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  17. Which of the following does not show geometrical isomerism?

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  18. https://media.cheggcdn.com/media%2F1d8%2F1d8cc659-3b9f-4ef8-be87-3f7a6...

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  19. Which of the following compounds exhibits geometrical isomerism?

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  20. Which of the following order of stability is correct among these two i...

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