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The conformations of n-butane , commonly...

The conformations of n-butane , commonly known as eclipsed , gauche and anti-conformation can be interconverted by

A

rotation around C - H bond of a methyl group

B

rotation around C- H bond of a methylene group

C

rotation around C1 - C2 linkage

D

rotation around C2-C3 linkage

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The correct Answer is:
D
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The conformations of n-butane, commonly known as eclipsed, gauche and anti-conformations can be interconverted by:

How can an eclipsed conformation of ethane be converted into a staggered conformation ?

Draw the eclipsed and staggered conformations of ethane and comment on the relative stabilities of the two conformations.

Conformations are different arrangements of atoms that are interconverted by rotation about single bond. In eclipsed conformation the C-H bond on one carbon is directly aligned with C-H bond on the adjacent carbon. The angle that separates a bond on one atom from a bond on a adjacent atom is called a dihedral angle. A staggered conformation with two larger groups 180^@ from each other is called anti. A stagged conformation with two larger group 60^@ from each other is called gauche. Identify the most stable conformer of 2-fluoro ethanol among the following :

The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is -

The correct statement regarding the comparison of staggered and eclipsed conformation of ethane , is -

Arrange the following conformations of n-butane according to their increasing stability : gauche-staggered (I), fully eclipsed (II),eclipsed (III) and -staggered (IV).

Conformations are different arrangements of atoms that are interconverted by rotation about single bond. In eclipsed conformation the C-H bond on one carbon is directly aligned with C-H bond on the adjacent carbon. The angle that separates a bond on one atom from a bond on a adjacent atom is called a dihedral angle. A staggered conformation with two larger groups 180^@ from each other is called anti. A stagged conformation with two larger group 60^@ from each other is called gauche. Which of the following is gauche conformer ?

Give examples of a chiral conformation and an achiral conformation of n-butane.

Draw the eclipsed and staggered conformations of ethane using Newman projection formula.

CHHAYA PUBLICATION-PREVIOUS YEAR QUESTION PAPER 2019-WBJEE 2019
  1. In the equilibrium H(2) + I(2) hArr 2HI , if at a given temperature th...

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  2. Which one of the following electronic arrangement is absurd ?

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  3. The quantity h v// K(B) corresponds to -

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  4. In the crystalline solid MSO(4) , n H(2)O of molar mass 250 g * mol...

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  5. At S.T.P. the volume of 7.5 g of a gas is 5.6 L . The gas is -

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  6. The second Ionisation Energy of the following elements follows the ord...

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  7. The melting points of (i) BeCl(2) (ii) CaCl(2) and (iii) HgCl(2) follo...

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  8. Which of these species will have non -zero magnetic moment ?

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  9. The first electron affinity of C , N and O will be of the order -

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  10. The H-N-H angle in ammonia is 107.6^(@) , while the H-P-H angle in pho...

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  11. The conformations of n-butane , commonly known as eclipsed , gauche an...

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  12. The correct order of the addition reaction rates of halogen acids with...

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  13. The indicated atom is not a nucleophilic site in -

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  14. Which of the following mixtures will have the lowest pH at 298 K ?

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  15. For the equilibrium H(2) O(l) hArr H(2) O (v) , which of the followin...

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  16. For a van der Waal's gas , the term ((ab)/(sqrt2)) represents some -

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  17. At constant pressure , the heat of formation of a compound is not depe...

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  18. Which of the following chemicals may be used to identify three unlabel...

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