Which of the following represents the correct IUPAC name for the compounds concerned? (1) 2,2 - dimethylpentane or 2 - demethylpentane (2) 2,4,7 - trimethyloctane or 2,5,7 - trimethyloctane (3) 2 - chloro - 4 - methylpentane or 4 - chloro - 2 - methyl - pentane (4) But - 3 - yne - 1 - ol - 1 - yne.

Which of the following represents the correct IUPAC name for the compo

1.	Which of the following represents the correct IUPAC name for the compounds concerned? (1) 2,2 - dimethylpentane or 2 - demethylpentane (2) 2,4,7 - trimethyloctane or 2,5,7 - trimethyloctane (3) 2 - chloro - 4 - methylpentane or 4 - chloro - 2 - methyl - pentane (4) But - 3 - yne - 1 - ol - 1 - yne.
Answer» Solution :(1) 2,2 - dimethylpentane (two alkyl groups are on the same carbon and hence the locant is REPEATED twice). (2) 2,4,7 - trimethyloctane (since 2,4,7 locant set is lower than the set 2,5,7). (3) 2 - chloro - 4 - methylpentane (alphabetical ORDER of SUBSTITUENTS is MAINTAINED). (4) But - 3 - yne - 1 - ol (using lower locant for the PRINCIPAL functional group).