Question

The systematic name for the compound,

A. `4-(10`Bromo`-2-`chloroethyl`)`octane `-5-(1-`bromo`-2-`chloroethyl`)`octane
B. `4-(1-`Bromo`-2-`chloroethyl`)-5-(2-`bromo`-1-`chloroethyl`)`octane
C. `1,5-`Dibromo`-2,6-`dichloro`-3,4-`diisopropyl`-`hexane
D. `2,6-`Dibromo`-1,5-`dichloro`-3,4-`diisopropyl`-`hexane

Answer 1

Correct Answer - b
When there are two or more names of prefixes of substituents consist of identical words, the priority of citation is given to that group which contains the lowest locant at the first point of difference. For example, the prefix `1-`bromo `-2-`chloroethyl gets preference over the prefix `2-`bomo `-1-`chloroethyl. Thus,

`4-(1-`Bromo`-2-`chloethyl`)5-(2-`bromo`-1-`chloroethyl`)` octane.To decide the alphabetical order of the various substituents, the name of the complex substituent is considered to begin with the first letter of the complete name. For example, dichloromethyl group gets preference over trichloromethyl group. Thus