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Chapter 7: Q11P-a (page 197)

Which member in each of the following sets ranks higher?

-Hor-CH3

Short Answer

Expert verified

-CH3Ranks higher.

Step by step solution

01

E and Z designation

The cis-trans naming system works only for disubstituted alkenes having two substituents other than hydrogen on the double bond. But when trisubstituted and tetra substitution of the double bond is present then the E and Z system is used for describing alkene stereochemistry.

02

Rule for ranking substituents

  • Consider each of the double-bond carbons separately and rank the two substituents according to their atomic number of first atom in each. An atom with a higher atomic number will rank higher.
  • If the first atom same then, look at the second, third, or fourth atoms away from the double-bond until the first difference is found.
  • Multiple-bonded atoms are equivalent to the same number of single-bonded atoms.
03

Ranking of given groups

As ranking is atomic number dependent, more the atomic number higher will be ranking.

So, -CH3ranks higher.

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Most popular questions from this chapter

Question: Loratadine, marketed as an antiallergy medication under the name Claritin, has four rings, eight double bonds, and the formula C22H?CIN2O2 . How many hydrogens does loratadine have? (Calculate your answer; don’t count hydrogens in the structure.)

Draw a skeletal structure of the following carbocation. Identify it as primary, secondary, or tertiary, and identify the hydrogen atoms that have the proper orientation for hyperconjugation in the conformation shown.

Rank the substituents in each of the following sets according to the sequence rules:

-CO2H,-CH2OH,-C≡N,-CH2NH2

Which of the following compounds can exist as pairs of cis-trans isomers? Draw each cis-trans pair, and indicate the geometry of each isomer.CH3CH=CH2

Carbocations can be stabilized by resonance. Draw all the resonance forms that would stabilize each carbocation:
See all solutions

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