Answer :

(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 IUPAC name 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 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 is present in the C-3 of the parent chain. Hence, the correct IUPAC is but-3-yn-1-ol.

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