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E - Z Nomenclature | Cis - Trans Nomenclature | CIP Rule Video Lecture | Crash Course for IIT JAM Chemistry
FAQs on E - Z Nomenclature - Cis - Trans Nomenclature - CIP Rule Video Lecture - Crash Course for IIT JAM Chemistry
| 1. What is E-Z nomenclature in chemistry? |  |
Ans. E-Z nomenclature is a system used to name geometric isomers in organic chemistry. It is based on the priority of substituents attached to a double bond or a ring. The E-Z notation is used to describe the arrangement of the highest priority substituents on either side of the double bond or ring, with E representing "entgegen" (German for "opposite") and Z representing "zusammen" (German for "together").
| 2. How does cis-trans nomenclature differ from E-Z nomenclature? | |
Ans. Cis-trans nomenclature is a simpler system used to name geometric isomers, specifically for molecules with restricted rotation. It only considers the arrangement of substituents on the same side (cis) or opposite sides (trans) of a double bond or ring. E-Z nomenclature, on the other hand, takes into account the priority of substituents and provides a more specific and detailed naming system.
| 3. What is the CIP rule in chemistry? | |
Ans. The Cahn-Ingold-Prelog (CIP) rule is a set of rules used to assign priorities to substituents in a molecule. It is particularly important in E-Z nomenclature and determining the E or Z configuration of geometric isomers. The CIP rule assigns priorities based on the atomic number of the atoms directly attached to the stereocenter, with higher atomic number indicating higher priority.
| 4. How do you determine the E or Z configuration using the CIP rule? | |
Ans. To determine the E or Z configuration using the CIP rule, follow these steps:
1. Assign priorities to the substituents based on the CIP rule.
2. Identify the two highest priority substituents on each side of the double bond or ring.
3. Compare the orientation of these two substituents. If they are on the same side, it is a Z configuration (zusammen). If they are on opposite sides, it is an E configuration (entgegen).
| 5. Are E and Z configurations always possible for all double bonds or rings? | |
Ans. No, E and Z configurations are not always possible for all double bonds or rings. The E-Z nomenclature is applicable only to geometric isomers where there is restricted rotation around the double bond or ring. If the molecule can freely rotate, such as in a fully substituted double bond or a simple alkane, the E-Z nomenclature does not apply. In such cases, cis-trans nomenclature or other naming conventions may be used.
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Dec 22, 2024 Last updated |
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