(a)The prefix di in the IUPAC name indicates that two identical substituent groups are
present in the parent chain. Since two methyl groups are present in the C–2 of the
parent chain of the given compound, the correct IPUAC name of the given
compound is 2, 2–dimethylpentane.
(b)Locant number 2, 4, 7 is lower than 2, 5, 7. Hence, the IUPAC name of the given
compound is 2, 4, 7–trimethyloctane.
(c)If the substituents are present in the equivalent position of the parent chain, then
the lower number is given to the one that comes first in the name according to the
alphabetical order. Hence, the correct IUPAC name of the given compound is 2–
chloro– 4–methylpentane.
(d)Two functional groups – alcoholic and alkyne – are present in the given compound.
The principal functional group is the alcoholic group. Hence, the parent chain will
be suffixed with ol. The alkyne group is present in the C–3 of the parent chain.
Hence, the correct IUPAC name of the given compound is But-3-yn-1-ol.
