Isomers of Butane, Constitutional, Conformational, Staggered, Questions (For CBSE, ICSE, IAS, NET, NRA 2022)

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Staggered Conformation of Butane

  • The study of conformers mainly involves the arrangement of atoms or groups with respect to central atom.
  • There are different ways to represent conformers like Fisher projection, Saw-horse or Newman projection.
  • Newman projection can be defined as the representation of a molecule in which the atoms and bonds are viewed along the axis of rotation.
  • In a Newman projection, the front carbon is indicated as dot and back carbon atom as a circle. The substituent on carbon atoms can be viewed both in front of and behind the carbon-carbon bond.
  • For example, in ethane molecule, there are two possible conformations. One is with the dihedral angle and another in which dihedral angle is 60 degrees.
  • The first case is called as eclipsed conformation in which the H atoms of C-1 line up with the H-atoms of C-2.
  • H-atoms are line up perfectly close to each other.
  • In another conformer with dihedral 60 degrees, the H-atoms of C-1 is far enough to H-atoms of C-2. This is called the staggered conformation.
Staggered Conformation of Butane

Since H-atoms are far enough in staggered conformer, it is more stable than eclipsed conformer. Staggered conformer of butane can exist in two forms; anti and gauche conformers. If we fix the position of one carbon atom of butane and rotate other, it gives three types of conformers, eclipsed, anti and gauche.

There are two kinds of staggered conformations.

  • In anti-form, both methyl groups are at anti position. It is one of the most stable forms of butane.
  • The other one is known as gauche or skew conformation.
Staggered Conformation of Butane

Questions

How Many Isomers Are There for Butane?

Answer:

two isomers

For example, there are two isomers of butane,

What Are the Possible Isomers of Butane?

Answer:

Butane is an alkane with four carbon atoms so molecular formula is . It has two isomers; n-butane and isobutane.

Are Cyclobutene and Butane Isomers?

Answer:

Compounds with same molecular formula but two different structures as cyclic and open-chain are called ring chain isomers of each other. Cyclobutene and butene are ring chain isomers.

What is the Difference between Butane and N Butane?

Answer:

  • Two molecules, called butane and isobutane, are constitutional isomers. They are different molecules with different chemical and physical properties.
  • Butane has its four carbon atoms bonded in a continuous chain. Isobutane has a branched structure.

What Does Butane Mean?

Answer:

  • Butane is a gas at room temperature and atmospheric pressure. Butane is a highly flammable, colorless, easily liquefied gas that quickly vaporizes at room temperature.
  • The name butane comes from the roots but- (from butyric acid, named after the Greek word for butter)

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