I think the name should be 1-carbamoylpentane-3-sulphonic acid, but the answer sheet mentions it as 2-carbamoylpentane-3-sulphonic acid:

2-carbamoylpentane-3-sulphonic acid

Can anyone please explain why the chain starting with methyl group is considered parent chain instead of one starting with amide?

  • $\begingroup$ The methyl group is part of the pentane chain. Therefore, the carbamoyl group is at carbon 2. $\endgroup$ – user55119 Nov 14 '19 at 17:07
  • $\begingroup$ hint: your answer has neglected the methyl group entirely. $\endgroup$ – A.K. Nov 14 '19 at 18:47