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Grade: 11

(BOX !)
(A) trans 1,2 dimethyl cyclo hexane
(B) cis 1,3 dimethyl cyclo hexane
(C) cis 1 chloro 4-terbutyl cyclo hexane
(D) t-butyl cyclo hexane

(BOX 2)
(P) e-isomer
(Q)ae conformation
(R)plane of symmetry
(S) ee conformation
9 years ago

Answers : (1)

879 Points

Dear student,

The cis/trans system for naming isomers is not effective when there are more than two different substituents on a double bond. The E/Z notation should then be used. Z (from the German zusammen) means together and corresponds to the term cis; E (from the German entgegen) means opposite and corresponds to the term trans.

Whether a molecular configuration is designated E or Z is determined by the  (higher atomic numbers are given higher priority). For each of the two atoms in the double bond, it is necessary to determine which of the two substituents is of a higher priority. If both of the substituents of higher priority are on the same side, the arrangement is Z; if they are on opposite sides, the arrangement is E.

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Askiitians Expert

Sagar Singh

B.Tech, IIT Delhi

9 years ago
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