For the potential energy graph, the energy difference between eclipse and staggered is 12 KJ/mol.
Is staggered or eclipsed higher in energy?
The energy of the eclipsed conformation is approximately 3 kcal/mol higher than that of the staggered conformation. Another 60°rotation returns the molecule to a second eclipsed conformation.
What is the energy difference between the staggered conformations?
Question: The energy difference between the staggered and eclipsed conformations of ethane is ~3 kcal/mol. This is called the torsional energy. Eclipsing introduces a torsional strain into the ethane molecule.
What is staggered conformation & eclipsed conformation of ethane compare them?
In an eclipsed conformation the carbons are aligned so that the hydrogens are lined up with each other. This creates steric hindrance between them. In a staggered conformation the atoms are all equally spaced from each other. The eclipsed conformation of ethane is less stable than the staggered conformation.
Which form of ethane has the least torsional strain?
Staggered form
Staggered form has the least torsional strain and the eclipsed form has the maximum torsional strain.
How many conformations are possible for ethane?
This process can be continued all around the 360°circle, with three possible eclipsed conformations and three staggered conformations, in addition to an infinite number of variations in between.
What is conformation of ethane?
In the eclipsed conformation, the C-H bonds on the front and back carbons are aligned with each other with dihedral angles of 0 degrees. In the staggered conformation, the C-H bonds on the rear carbon lie between those on the front carbon with dihedral angles of 60 degrees.
Which are the staggered form of ethane?
The lowest energy conformation of ethane, shown in the figure above, is called the ‘staggered’ conformation, in which all of the C-H bonds on the front carbon are positioned at dihedral angles of 60°relative to the C-H bonds on the back carbon.
What is the energy difference between the eclipsed conformations?
The energy of the eclipsed conformation is approximately 3 kcal/mol (12 kJ/mol) higher than that of the staggered conformation. Torsional strain (or eclipsing strain) is the name give to the energy difference caused by the increased electrostatic repulsion of eclipsing bonds.
How will you differentiate between staggered and eclipsed conformation?
The term conformation describes different forms of projections of a molecule. The main difference between staggered conformation and eclipsed conformation is that staggered conformation has a lower potential energy whereas eclipsed conformation has the maximum potential energy.
Which conformation of ethane has maximum energy?
eclipsed
If we now rotate the front CH3 group 60° clockwise, the molecule is in the highest energy ‘eclipsed’ conformation, where the hydrogens on the front carbon are as close as possible to the hydrogens on the back carbon.
What is the energy difference between eclipsed and staggered ethane?
The energy difference between eclipsed and staggered ethane is approximately 3 kcal mol − 1. 4 This is shown in Figure 5-6 as the height of the peaks (eclipsed forms) separating the valleys (staggered forms) on a curve showing the potential energy of ethane as the methyl groups rotate with respect to each other through 360 o.
Why is the eclipsed conformation of ethane unstable?
Thus, eclipsed conformation is less stable. In this arrangement, the strain between atoms is very high. Since this conformation is unstable, it indicates that this molecule has a high potential energy. The above image shows a sketch of the eclipsed conformation of ethane.
What is the energy of eclipsed conformation?
This is the highest energy conformation because of unfavorable interactions between the electrons in the front and back C-H bonds. The energy of the eclipsed conformation is approximately 3 kcal/mol higher than that of the staggered conformation. What is torsional strain?
Why is staggered conformation more stable than eclipsed formation?
In terms of stability, staggered conformation is more stable than eclipsed formation. The formation of the staggered confirmation is more favourable since its conformational energy is minimum.
