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Question
In the Newman projection formula of the least stable eclipsed form of n−butane, which of the following reasons is the cause of its unstability?
In the Newman projection formula of the least stable eclipsed form of n−butane, which of the following reasons is the cause of its unstability?
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Solution
The correct option is B Torsional strain
A weak repulsive interaction between adjacent bonds (electron cloud) is called torsional strain
Fully eclipsed conformation of n-butane is unstable due to torsional Strain strain due to over crowding , secondly moving from staggered to eclipsed develops torsional strain.
Torsional strain hinders the free rotation by an energy barrier
of 1-20 kJ/mol (at room temperature)
A weak repulsive interaction between adjacent bonds (electron cloud) is called torsional strain
Fully eclipsed conformation of n-butane is unstable due to torsional Strain strain due to over crowding , secondly moving from staggered to eclipsed develops torsional strain.
Torsional strain hinders the free rotation by an energy barrier
of 1-20 kJ/mol (at room temperature)
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