Question

what if bromine is attached to second carbon atom of pentane, it counts second from left hand side to right hand side and it counts fourth from right hand side to left hand side, so what should be it's name?​

Answer 1

Answer:

It is important to number the molecule from the correct end (in other words, in this example do you number the alkane from right to left or left to right). Following this rule, on this molecule you number from right to left, as the 2-carbon substituent is closer to that end.