SaitechAI Worksheet
Fill in the Blanks – Isomerism (20 × 1 = 20)
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1. Compounds with the same molecular formula but different structures are called __________.
Key: isomers
2. Isomerism due to different carbon skeletons is called __________ isomerism.
Key: chain
3. Isomerism in which the functional group remains same but its position changes is called __________ isomerism.
Key: position / positional
4. Ethanol and dimethyl ether are examples of __________ isomerism.
Key: functional
5. Isomerism arising due to different alkyl groups attached to polyvalent atoms like O, S or N is called __________.
Key: metamerism
6. Keto–enol interconversion is an example of __________.
Key: tautomerism
7. Isomerism that arises due to restricted rotation about a double bond is called __________ isomerism.
Key: geometrical (cis–trans)
8. In cis–trans isomerism, the isomer with similar groups on the same side is called the __________ isomer.
Key: cis
9. The isomer with similar groups on opposite sides of the double bond is called the __________ isomer.
Key: trans
10. A carbon atom attached to four different groups is called a __________ centre.
Key: chiral / stereogenic
11. Non-superimposable mirror-image isomers are called __________.
Key: enantiomers
12. Stereoisomers which are not mirror images of each other are called __________.
Key: diastereomers
13. A molecule which has a plane of symmetry and is optically inactive despite having chiral centres is called a __________ compound.
Key: meso
14. The sign used for dextrorotation of plane-polarised light is __________.
Key: + (plus)
15. Compounds related as enantiomers have identical physical properties except for their effect on __________ light.
Key: plane-polarised light
16. Different spatial arrangements arising due to rotation about single bonds are called __________.
Key: conformations / conformers
17. The most stable conformation of cyclohexane is the __________ form.
Key: chair
18. Maleic acid and fumaric acid are a pair of __________ isomers.
Key: geometrical (cis–trans)
19. In the E–Z notation, the E-configuration means high priority groups are on __________ sides of the double bond.
Key: opposite
20. Isomerism where only electron distribution changes without movement of atoms is called __________.
Key: resonance
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