Question

Which are the correct IUPAC names of the following compound?

• A. $5-neo-Pentyldecane$
• B. $4-Butyl-2,2-dimethylnonane$
  
• C. $5-(2^{\prime },2^{\prime }-Dimethylpropyl-decane$
• D. $2,2-Dimethyl-4-pentyloctane$
  

Answer 1

Answer: (A), (C)

$5-(2^{\prime },2^{\prime }-Dimethylpropyl-decane$

Structure

The longest carbon chain is 10 carbons along with a side chain at fifth carbon.


The side chain has three carbons in its straight chain and there are two methyl groups at second carbon; thus, this group can be named as ‘neopentyl’ or, $‘2^{\prime },2^{\prime }$-Dimethylpropyl’ group.

Hence, IUPAC names for the given alkane are: $5$-neopentyl decane
or, $5-(2^{\prime },2^{\prime }-Dimethylpropyl)$-decane.

Hence, options (A) and (D) are correct.