More than one of the following molecules from the five given below do not possess a plane of symmetry. Identify them.
a. b.
c. d.
e.
1. (a) and (b) 
2. (a), (c), and (b) 
3. (a), (d), and (e) 
4. (c), (d) and (e) 
Subtopic:  Stereo Isomers |
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Which of the following is the primary cause of geometrical isomerism in organic compounds?

1. Restricted rotation about a carbon–carbon double bond
2. Presence of an asymmetric (chiral) carbon atom
3. Attachment of different groups to the same functional group
4. Migration (shift) of a hydrogen atom between two polyvalent atoms
Subtopic:  Stereo Isomers |
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Which pair among the following is a pair of enantiomers:

1.
2.
3.
4.
Subtopic:  Stereo Isomers |
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AIPMT - 2003
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Compounds that rotate the plane of polarized light in the clockwise direction are termed as:

1. Dextrorotatory

2. Laevorotatory

3. Optically inactive compounds

4. Racemic mixture

Subtopic:  Stereo Isomers |
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Which of the following structures permits cis-trans isomerism?

1. X2C=CY

2. XYC=CZ2

3. X2C=CXY

4. XYC=CXY

Subtopic:  Stereo Isomers |
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The following two compounds (i) and (ii) are stereoisomers of each other. If compound (i) shows an optical rotation of +52°, the optical rotation of compound (ii) is:

1. -52°                2. +52°

3. 0°                   4. unpredictable

Subtopic:  Stereo Isomers |
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