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


7.
Which of the following statements is INCORRECT regarding conformations of ethane?
A.
Bond lengths and bond angles remain the same in all conformations
B.
Staggered conformation has minimum torsional strain
C.
Eclipsed and staggered conformations can be isolated at room temperature
D.
Newman and Sawhorse projections can represent ethane conformations
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ANSWER :
C. Eclipsed and staggered conformations can be isolated at room temperature
8.
In the Newman projection of ethane, the front carbon is represented by a ____ and the rear carbon by a ____.
A.
circle ; point
B.
point ; circle
C.
line ; dot
D.
triangle ; square
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ANSWER :
B. point ; circle
9.
In a Sawhorse projection of ethane, the molecule is viewed:
A.
Along the molecular axis with the C–C bond drawn as a slanted line
B.
From the top of one carbon
C.
Perpendicular to the C–C bond
D.
End-on along the C–H bond
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ANSWER :
A. Along the molecular axis with the C–C bond drawn as a slanted line
10.
Which of the following correctly represents the eclipsed conformation of ethane in a Newman projection?
A.
The rear C–H bonds are at 30° to the front C–H bonds
B.
The rear C–H bonds are at 90° to the front C–H bonds
C.
The three rear C–H bonds are exactly behind the three front C–H bonds (dihedral = 0°)
D.
The rear C–H bonds are at 60° to the front C–H bonds
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ANSWER :
C. The three rear C–H bonds are exactly behind the three front C–H bonds (dihedral = 0°)
11.
Conformations differing only in the angle of rotation about the C–C single bond are called:
A.
Diastereomers
B.
Enantiomers
C.
Tautomers
D.
Rotamers
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ANSWER :
D. Rotamers
12.
Which of the following statements about Sawhorse and Newman projections is correct?
A.
Neither can represent conformations of ethane
B.
Both can represent eclipsed and staggered conformations of ethane
C.
Only Newman can represent eclipsed conformation
D.
Only Sawhorse can represent staggered conformation
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ANSWER :
B. Both can represent eclipsed and staggered conformations of ethane