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The anti-conformation of n-butane is mor...

The anti-conformation of `n`-butane is more stable than its gauche conformation by about

A

`5KJ mol^(-1)`

B

`3.8KJ mol^(-1)`

C

`6.2KJ mol^(-1)`

D

`4.5KJ mol^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
The anti conforamtion is more stalbe by about `3.8KJmil^(-1)` than the gauche. Both are free of torsional strain. But in a gauche conformation, the two methyl groups are crowded together, i.e., are thrown together closer than the sum of their van der Waals radii. Under these conditions, van der Waals forces are repulsive and raise the energy of the conformation.
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Knowledge Check

  • The anti-conformation of n -butane is more stable than its fully eclipsed conformation by about

    A
    `16 KJmol^(-1)`
    B
    `25.49KJ mol^(-1)`
    C
    `13KJ mol^(-1)`
    D
    `19KJmol^(-1)`

  • The staggered conformation of ethane is more stalble than its elispsed conforamtion by about

    A
    `4"kcal mol"^(-1)`
    B
    `5"kcal mol"^(-1)`
    C
    `2"kcal mol"^(-1)`
    D
    `3"kcal mol"^(-1)`

  • Statement-1. The guache conformation of ethylene glycol is more stable than its anti conformation Statement-2. The gauche conformation is stabilized by H-bonding.

    A
    Statement-1 is True, Statement-2 is True , Statement-2 is a correct explanation for Statement-1
    B
    Statement-1 is True, Statement-2 is True , Statement-2 is not a correct explanation for Statement-1
    C
    Statement- 1 is True, Statement-2 is False
    D
    Statement-1 is False, Statement -2 is True

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    Assertion : Staggered conformation of ethane is 12.5 kJ mol^(−1) more stable than the eclipsed conformation. Reason : The two conformations of ethane cannot be separated at room temperature.

    The conformations of n-butane, commonly known as eclipsed, gauche and anti-conformations can be interconverted by

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