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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 |
Which pair among the following is a pair of enantiomers:
| 1. | |
| 2. | |
| 3. | |
| 4. |
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
Which of the following structures permits cis-trans isomerism?
1. X2C=CY2
2. XYC=CZ2
3. X2C=CXY
4. XYC=CXY
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