What is the systematic name of the given molecule?

Which of the following isomers has a sec-butyl group?

For each of the following incorrect or incomplete names, draw a corresponding structure and name appropriately.

(i) 2-ethylhexane

(ii) 3-isopropylheptane

Provide the correct structures corresponding to the names (a) hexylcyclohexane and (b) 1-( tert-butyl)-3,5-dimethylcyclohexane.

Draw all four different four-carbon alkyl groups and give each of them the appropriate systematic name.

Provide the name of the molecule shown below based on the IUPAC nomenclature:

Consider the substituents on the following nine carbon chains, what are their common names and IUPAC names?

(I)   (ii)