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Chapter 7: Q11P-d (page 197)

Which member in each of the following sets ranks higher?

-NHCH3or-OCH3

Short Answer

Expert verified

-OCH3Ranks 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 ranks the two substituents according to the atomic number of the 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,-OCH3 ranks higher as oxygen has more atomic numbers than nitrogen.

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Most popular questions from this chapter

Use Hammond’s Postulate to determine which alkene in each pair would be expected to form a carbocation faster in an electrophilic addition reaction:

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.

Allene (1,2-propadiene), H2C = C = CH2, has two adjacent double bonds. What kind of hybridization must the central carbon have? Sketch the bonding πorbitals in allene. What shape do you predict for allene?

Predict the products of the following reactions:

Which member in each of the following sets ranks higher?

-CH2OHor-CH=O
See all solutions

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