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.
Which conformation of ethane is the most stable?
A.
Eclipsed
B.
Skew
C.
Gauche
D.
Staggered
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ANSWER :
D. Staggered
2.
In the Newman projection, the angle between bonds on the front and back carbon in the staggered conformation is:
A.
60Ā°
B.
0Ā°
C.
90Ā°
D.
120Ā°
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ANSWER :
A. 60Ā°
3.
The energy difference between staggered and eclipsed conformations of ethane is approximately:
A.
3 kcal/mol
B.
1 kcal/mol
C.
10 kcal/mol
D.
5 kcal/mol
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ANSWER :
B. 1 kcal/mol
4.
Which of the following shows torsional strain in its eclipsed form?
A.
Ethane
B.
Propane
C.
Butane
D.
All of these
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ANSWER :
D. All of these
5.
Newman projection is drawn by viewing the molecule along the:
A.
Longest carbon chain
B.
Plane of molecule
C.
Cā€“C bond
D.
Cā€“H bond
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ANSWER :
C. Cā€“C bond
6.
Which statement is true for the staggered conformation of ethane?
A.
Hydrogens on adjacent carbons are aligned
B.
Maximum torsional strain
C.
Most stable
D.
Least stable
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ANSWER :
C. Most stable