How many distinct dichlorination products can result when isobutane is subjected to free radical chlorination? How many distinct dichlorination products can result when isobutane is subjected to free radical chlorination?


I think that three distinct products may result namely
a) 1,1-Dichloro-2-methylpropane
b) 1,2-Dichloro-2-methylpropane
c) 1,3-Dichloro-2-methylpropane

But the book says only two distinct products may form. Can anyone explain how?
The following three products wil be formed:


Your book may be giving the answer to the number of monochloro products formed, as there are only two distinct monochloro products formed on chlorination of isobutane.