Question -
Answer -
(a) The prefix di inthe IUPAC name indicates that two identical substituent groups are present inthe parent chain. Since two methyl groups are present in the C–2 of the parentchain 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 thesubstituents are present in the equivalent position of the parent chain, thenthe lower number is given to the one that comes first in the name according tothe alphabetical order. Hence, the correct IUPAC name of the given compound is2–chloro–4–methylpentane.
(d) Two functionalgroups – alcoholic and alkyne – are present in the given compound. Theprincipal functional group is the alcoholic group. Hence, the parent chain willbe suffixed with ol. The alkyne group is present in the C–3 of theparent chain. Hence, the correct IUPAC name of the given compound isBut–3–yn–1–ol.