Question

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100. Which of the following is the correct order of stability of the
following four distinct conformation of n-butane?
(a) Gauche > Staggered > Partially eclipsed
> Fully eclipsed
(b) Staggered > Gauche > Partially eclipsed
> Fully eclipsed
(c) Staggered > Partially eclipsed > Gauche
> Fully eclipsed
(d) Fully eclipsed > Staggered > Partially eclipsed
> Gauche
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OLIO​

Answer 1

ANSWER

Your answer is option no 'b'

Answer 2

Answer:

Concept:

Butane, often known as n-butane, is a hydrocarbon having the formula C4H10. Butane is a combustible, colourless, and easily condensed gas that vaporises quickly at ambient temperature. Butane is derived from the root but- (derived from butyric acid, which is named just after Greek word for butter) as well as the suffix -ane. Dr. Walter Snelling, a chemist, discovered it in 1912. Edmund Ronalds discovered it dissolved in crude petroleum in 1864 and was the first to characterise its qualities.

Given:

Which of the below four different conformations of n-butane has the proper order of stability?

[A] gauche > staggered > partially eclipsed > fully eclipsed

[B] staggered > gauche > partially eclipsed > fully eclipsed

[C] staggered > partially eclipsed > gauche > fully eclipsed

[D] Fully Eclipsed > Staggered > Partially Eclipsed > Gauche

Find:

find the correct option for the given question

Answer:

The answer is option [D]

Fully eclipsed > Staggered > Partially eclipsed > Gauche

The gauche stagger and eclipse n-butane conformations are less stable than the anti-staggered n-butane conformation. The methyl groups in anti staggered n-butane are arranged at a dihedral angle of 180, and steric hindrance is negligible in anti-form compared to gauche form. Due to different steric interactions, the anti conformer is by far the most stable conformer. The second least stable conformer is the gauche conformer.

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