Question 56

The dihedral angle in staggered form of Newmann's projection of 1, 1, 1-Trichloro ethane is _________ degree. (Round off to the nearest integer)

Correct Answer: 60

Solution

The molecule naturally rotates into the "staggered" conformation because it is the most stable. In this form, the atoms on the front carbon position themselves to be as far away as possible from the atoms on the back carbon to minimize electron repulsion (steric strain).

Calculating the Dihedral Angle: To achieve this maximum distance, the bonds of the front carbon perfectly bisect (cut exactly in half) the space between the bonds of the back carbon.

Since the gap between two back bonds is 120°, and the front bond sits exactly in the dead-center of that gap, the dihedral angle (the angle between a front bond and its nearest adjacent back bond) is exactly half of 120°. Therefore, 120 / 2 = 60°.

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The dihedral angle in staggered form of Newmann's projection of 1, 1, 1-Trichloro ethane is _________ degree. (Round off to the nearest integer)

Solution

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