What is the extended structural formula of 2-methyl propane?

Answer 1

Difficult to draw here, but let's try to describe:

Three methyl groups (CH3-) and one H- atom bonded to one central C atom, then you'll get something like this:

. . . .H

CH3-C-CH3

. . . .CH3

Answer 2

The extended structural formula of 2-methylpropane is CH3-CH(CH3)-CH3.

Answer 3

Propane is CH3 - CH2 - CH3

2-methyl [ropane is CH3 - CH(CH3) - CH3