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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

`180^(@)`

C

`45^(@)`

D

`60^(@)`

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The correct Answer is:
D
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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-ACYCLIC HYDROCARBONS -PRACTICE EXERCISE
  1. Polythene is

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  2. Which of the following is not obtained when propyl chloride and methyl...

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  3. The dihedral angle between the two methyl groups in gauche conformatio...

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  4. Dehydration means

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  5. The IUPAC name of the product formed when ethylene reacts with hypochl...

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  6. The oxidation product of ethylene by air at 200-400^(@)C in presence o...

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  7. Boverset(alc.KOH)larrC(2)H(5)Clunderset(C(2)H(5)OH)overset(Zn-Cu)rarrA...

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  8. The most important method of preparation of hydrocarbons of lower carb...

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  9. CH(3)-CH(2)Cloverset("alcoholic KOH")rarrA Compound Aoverset(Br(2))rar...

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  10. C(2)H(5)Cloverset(AlcKOH)rarr Product. This reaction is known as

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  11. Which of the following compounds does not form an ozonide?

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  12. One mole of a symmetrical alkene on ozonolysis gives two moles of an a...

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  13. IUAPC name of allyl chloride is

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  14. Correct statement about ethene is

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  15. Incorret statement about addition of halogen to alkenes

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  16. CH(3)-CH=CH-CH(3)overset(KMnO(4)//H^(+))rarr product in this reaction

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  17. (CH(3))(2)C=CH-CH(3)overset(H^(+)//KMnO(4))rarr Products in this react...

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  18. Photochemical chlorination of alkane is initiated by a process

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  19. The method of converting high boiling hydrocarbons into low boiling hy...

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  20. Both methane and ethane may be obtained by suitable one step reaction ...

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