The number of dichloro derivatives (structural isomers, stereoisomers not counted) of 2-methylpropane is

Answer: D

Same carbon: only on a methyl, giving 1,1-dichloro-2-methylpropane (the CH has one H only). Different carbons: methyl-methyl gives 1,3-dichloro-2-methylpropane; methyl-CH gives 1,2-dichloro-2-methylpropane. Total 3.

Practice IUPAC Nomenclature and Structural Isomerism More on Counting structural isomers

Previous questionNext question

More questions on Counting structural isomers

Which of the following statements about halogen-substituted benzene rings (structural isomers) is/are correct? JEE Main level
n-Butane is dichlorinated by free-radical substitution. How many structural isomers of C4H8Cl2 can be formed in total (stereoisomers not cou... JEE Main level
All possible dichloro substitution products C5H10Cl2 of 2-methylbutane are considered. How many structural isomers (no stereoisomers counted... JEE Advanced level
Methylcyclopropane is dichlorinated on the ring or the side chain. How many dichloro structural isomers of C4H6Cl2 are possible (stereoisome... JEE Advanced level
If each of the five isomeric hexanes is monochlorinated and all possible structural isomers of C6H13Cl are collected, what is the total numb... JEE Advanced level
Open-chain saturated alcohols of formula C5H12O that give a positive iodoform test (the unit CH3-CH(OH)- must be present) number JEE Advanced level