Answer. Alkyl radicals are derivatives of alkanes. They are formed by the removal of one of the hydrogen atom of an alkane and are represented by a letter 'R. Their name is written by replacing 'ane' of alkane with ‘yl’. For example, propane has a straight chain structure.
When terminal H is removed it is called n-propyl. When hydrogen from central carbon is removed it is called isopropyl, as explained below:
Removal of terminal H→ CH3-CH2-CH2- n-propyl
H
CH3―CH2―CH3 I
Propane Removal of centralH→ CH3—C―CH3 isopropyl
I