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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

Which member in each of the following sets ranks higher?

-CH2OHor-CH=O

How many hydrogens does each of the following compounds have?

(a) C8H?O2, has two rings and one double bond

(b)C7H?N , has two double bonds

(c)C9H?NO , has one ring and three double bonds

Assign E or Z configuration to the following alkenes:

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.(CH3)2C=C(CH3)CH2CH3

Question : Which of the following E, Z designations are correct, and which are incorrect ?
See all solutions

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