Q.

In the Newman projection formula of the least stable staggered form of z-butane, which of the following reasons is the causes of its unstability ?

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a

Van der Waals strain

b

Torsinal strain

c

Combination of both

d

None of these

answer is C.

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Detailed Solution

Fully eclipsed conformation of n-butane is unstable due to van der Waals strain due to over crowding. Secondly moving from staggered to eclipsed develops torsional strain.

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