Question

I.U.P.A.C. name of $(C{H}_3{)}_{2}CH–C{H}_2–C{H}_{2}Br$

• A. 1-bromo pentane
• B. 2-methyl-4-bromo pentane
• C. 1-bromo-3-methyl butane
• D. 2-methyl-3-bromo propane

Answer 1

The correct option is C 1-bromo-3-methyl butane

Since there are four carbon in the parent chain, parent chain will be butane. Numbering will start from the side where substituents gets lowest possible numbers i.e. from bromine side (in this compound). So, Br will get number = 1 and methyl group will get number = 3. Out of bromine and methyl, bromine will be written first because of alphabetical order.
Therefore, I.U.P.A.C name of compound is 1-bromo-3-methyl butane