Name the following alkenes, including the cis or trans...

Name the following alkenes, including the cis or trans designation: Which member in each of the following sets ranks higher? (a) $-\mathrm{H}$ or $-\mathrm{CH}_{3}$ (b) $-\mathrm{Cl}$ or $-\mathrm{CH}_{2} \mathrm{Cl}$ (c) $-\mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{Br}$ or $-\mathrm{CH}=\mathrm{CH}_{2}$ (d) $-\mathrm{NHCH}_{3}$ or $-\mathrm{OCH}_{3}$ (e) $-\mathrm{CH}_{2} \mathrm{OH}$ or $-\mathrm{CH}=\mathrm{O}$ (f) $-\mathrm{CH}_{2} \mathrm{OCH}_{3}$ or $-\mathrm{CH}=\mathrm{O}$

Name the following alkenes, including the cis or trans designation:
Which member in each of the following sets ranks higher?
(a) $-\mathrm{H}$ or $-\mathrm{CH}_{3}$
(b) $-\mathrm{Cl}$ or $-\mathrm{CH}_{2} \mathrm{Cl}$
(c) $-\mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{Br}$ or $-\mathrm{CH}=\mathrm{CH}_{2}$
(d) $-\mathrm{NHCH}_{3}$ or $-\mathrm{OCH}_{3}$
(e) $-\mathrm{CH}_{2} \mathrm{OH}$ or $-\mathrm{CH}=\mathrm{O}$
(f) $-\mathrm{CH}_{2} \mathrm{OCH}_{3}$ or $-\mathrm{CH}=\mathrm{O}$

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

Cahn-Ingold-Prelog Priority Rules

The Cahn-Ingold-Prelog (CIP) system is a set of conventions used in chemistry to assign priorities to substituent groups attached to stereocenters or double bonds based on atomic numbers and connectivity. In the context of alkenes, these rules help determine which substituent on each carbon of the double bond has higher priority, a fundamental step in assigning stereochemical descriptors such as E/Z or cis/trans.

Stereochemical Designation in Alkenes

Stereochemical designations in alkenes, typically expressed as E (entgegen) or Z (zusammen) or as cis/trans in certain contexts, indicate the relative positions of the higher priority substituents on each carbon of the double bond. This designation is crucial for distinguishing between different geometric isomers which, despite having the same molecular formula, may exhibit different chemical properties due to the spatial arrangement of their groups.

Substituent Priority Comparison

Substituent priority comparison involves evaluating two or more substituents attached to a carbon chain based on factors such as atomic number, connectivity, and the presence of multiple bonds. This process, governed by the CIP rules, is critical in accurately naming compounds, as it determines the hierarchy of substituents for proper stereochemical and systematic nomenclature.

Transcript

Please give Ace some feedback