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(a) Draw sawhorse projection formulae fo...

(a) Draw sawhorse projection formulae for the two eclipsed conformations of butane.
(b) What is the dihedral angle between adjaccent methyl groups? (c) Which conformer has greater torsional strain?

Text Solution

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(a)
(b) Dihedral angle `0^(@)` Dihedral angle `120^(@)`
(c) Greater torsional strain because two Me's are exzctly eclipsing each other. Lesser trorsional strain because two Me's are fathest apart.
Dihedral angle is the angle between from the H on one C and H of other C as seen along the (C --- C) bond. The dihederal angle in eclipes and staggered forms is `0^(@)` and `60^(@)`, respectively.
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Knowledge Check

  • Which of the following sawhorse projection formulae represents the gauche conformation of butane?

    A
    B
    C
    D

  • Assertion: Staggered conformation of ethane is most stable while eclipsed conformation is least stable. ltbr. Reason: Staggered form has the least torsional strain and the eclipsed form has the maximum torsional strain.

    A
    If both assertion and reson are true and reason is the correct explanation of assertion
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

  • Conformations are different arrangements of atoms that are interconverted by rotation about single bond. In eclipsed conformation, the C-H bond on-one carbon is directly aligned with C-H bond on the adjacent carbon. In staggered conformation, the c H bond on one carbon biseçt, the H G H bond angle on adjacent carbon. The angle that separates a bond on one atom from a bond on a adjacent atom is called a dihedral angle. A staggered conformation with two larger groups 180^(@) from each other is called anti. A staggered conformation with two larger group 60^(@) from each other is called gauche. Which of the following conformer of butane has minimum,energy?

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    Conformations are different arrangements of atoms that are interconverted by rotation about single bond. In eclipsed conformation, the C-H bond on-one carbon is directly aligned with C-H bond on the adjacent carbon. In staggered conformation, the c H bond on one carbon biseçt, the H G H bond angle on adjacent carbon. The angle that separates a bond on one atom from a bond on a adjacent atom is called a dihedral angle. A staggered conformation with two larger groups 180^(@) from each other is called anti. A staggered conformation with two larger group 60^(@) from each other is called gauche. Which of the following is gauche conformer?

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