Explanation

(d)
1${^\circ}$ carbon is attached to one carbon atom.
2${^\circ}$ carbon is attached to two carbon atms.
3${^\circ}$ carbon is attached to three carbon atoms.
The hydrogen attached to 2${^\circ}$ carbon atom are$\ 2{^\circ}$.
[image:12_image470.emf]
∴ It has one 2${^\circ}$ carbon atom and two $2{^\circ}$hydrogen atoms.