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In the given conformation C(2) is rotate...

In the given conformation `C_(2)` is rotated about `C_(2)-C_(3)` bond by `120^(@)`, then the conformation formed will be

A

fully eclipsed

B

partially eclipsed

C

gauche

D

staggered

Text Solution

Verified by Experts

The correct Answer is:
C
At dihedral angles 0, 120, 240,…… eclipsed
At dihedral angles 60, 180, 360, …….. Staggered
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Consider the following conformations of 3-Aminopropanal, amongst the given conformations (P, Q, R, S) one of them is most stable. The correct statements for the above is/are : (I) H-bonding is present in the most stable conformer (II) Gauche conformation is the most stable conformer (III) Anti conformation is the most stable conformer (IV) larger groups being separated by maximum distance in the conformer

C_(1)-C_(2) bond is shortest in

Knowledge Check

  • The number of conformational isomers possible of n-butane about C_(2)-C_(3) bond

    A
    One
    B
    Four
    C
    Three
    D
    Infinite

  • Which of the following is correct regarding stability of conformations of n-butane about C_(2)-C bond Anti (I) gauche (II) partially eclipsed (III) fülly eclipsed (IV)

    A
    I `gt` II `gt` III `gt` IV
    B
    I `gt` II `gt` IV `gt` III
    C
    IV `gt` III `gt` II `gt` I
    D
    IV `gt` II `gt` I `gt` III

  • C_(1)-C_(2) bond is shortest in

    A
    B
    C
    D

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    In the compound CH_(2)= CH- CH_(2) - CH_(2) - C -= CH, " the " C_(2) - CH_(3) bond is of the type

    Stereoisomers, which can be interconverted simply by rotation about sigma bonds, are conformational isomers while those, which can be converted only by breaking and remaking of bonds and not simply by rotation, are called configurational isomers. The angle between C-C and C – H bonds on adjacent carbon atoms in any conformation is called dihedral angle. The cyclic compounds most commonly found in nature containing six membered rings can exist in a conformation that is almost completely free of strain. The most stable conformation of cyclohexane is chair form. According to Bayer strain theory, the greater deviation from the normal tetrahedral angle, greater is the angle strain or torsional strain and hence lesser is the stability of the cycloalkane. Which among the following conformation of cyclohexane is the most stable form ?

    Stereoisomers, which can be interconverted simply by rotation about sigma bonds, are conformational isomers while those, which can be converted only by breaking and remaking of bonds and not simply by rotation, are called configurational isomers. The angle between C-C and C – H bonds on adjacent carbon atoms in any conformation is called dihedral angle. The cyclic compounds most commonly found in nature containing six membered rings can exist in a conformation that is almost completely free of strain. The most stable conformation of cyclohexane is chair form. According to Bayer strain theory, the greater deviation from the normal tetrahedral angle, greater is the angle strain or torsional strain and hence lesser is the stability of the cycloalkane. Which among the following conformation of cyclohexane is the most stable form ?

    Stereoisomers, which can be interconverted simply by rotation about sigma bonds, are conformational isomers while those, which can be converted only by breaking and remaking of bonds and not simply by rotation, are called configurational isomers. The angle between C-C and C – H bonds on adjacent carbon atoms in any conformation is called dihedral angle. The cyclic compounds most commonly found in nature containing six membered rings can exist in a conformation that is almost completely free of strain. The most stable conformation of cyclohexane is chair form. According to Bayer strain theory, the greater deviation from the normal tetrahedral angle, greater is the angle strain or torsional strain and hence lesser is the stability of the cycloalkane. Dihedral angle in staggered (gauche) and eclipsed conformation are:

    Stereoisomers, which can be interconverted simply by rotation about sigma bonds, are conformational isomers while those, which can be converted only by breaking and remaking of bonds and not simply by rotation, are called configurational isomers. The angle between C-C and C – H bonds on adjacent carbon atoms in any conformation is called dihedral angle. The cyclic compounds most commonly found in nature containing six membered rings can exist in a conformation that is almost completely free of strain. The most stable conformation of cyclohexane is chair form. According to Bayer strain theory, the greater deviation from the normal tetrahedral angle, greater is the angle strain or torsional strain and hence lesser is the stability of the cycloalkane. Dihedral angle between two methyl groups of n-butane in the gauche and anti forms are :

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