Alkanes (Conformations: Sawhorse and Newman Projections : Mechanism of Halogenation ) NEET Questions

Organic Chemistry - Hydrocarbons

Alkanes (Conformations: Sawhorse and Newman Projections : Mechanism of Halogenation ) MCQ Questions


1.
Different spatial arrangements of atoms in a molecule which can be interconverted by rotation about a C–C single bond are called:
A.
Geometrical isomers
B.
Configurations
C.
Optical isomers
D.
Conformations
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ANSWER :
D. Conformations
2.
The energy barrier to rotation about the C–C bond in ethane is approximately:
A.
12.5 kJ mol⁻¹
B.
125 kJ mol⁻¹
C.
50 kJ mol⁻¹
D.
1.25 kJ mol⁻¹
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ANSWER :
A. 12.5 kJ mol⁻¹
3.
In ethane molecule, the most stable conformation is:
A.
Eclipsed
B.
Gauche
C.
Staggered
D.
Skew
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ANSWER :
C. Staggered
4.
In the eclipsed conformation of ethane, the dihedral angle (torsional angle) between the C–H bonds on the two carbon atoms is:
A.
60°
B.
0°
C.
90°
D.
180°
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ANSWER :
B. 0°
5.
The dihedral angle in the staggered conformation of ethane is:
A.
60°
B.
90°
C.
120°
D.
0°
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ANSWER :
A. 60°
6.
The repulsive interaction between the electron clouds of bonds on adjacent carbon atoms responsible for the relative instability of eclipsed conformation is called:
A.
Steric strain
B.
Van der Waals strain
C.
Angle strain
D.
Torsional strain
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ANSWER :
D. Torsional strain