isopropyl
When one hydrogen is removed from an alkane it forms alkyl group
primary: OH group attached to 1 carbon atom secondary: OH group attached to 2 carbon atoms tertairy: OH group attached to 3 carbon atoms
Because they donate the electrons to aromatic ring due to hyper conjugation (temporary bond breaking between carbon and hydrogen)
An alkane is the class of single bonded hydrocarbon molecules. An alkyl group is an alkane but is treated like a substituent. It is usually missing one hydrogen. An example: CH4 methane -CH3 methyl