`C_8H_18` with two quanternary carbon aoms will have

Options

A. one `-CH_2` and six `-CH_3` groups
B. one `-CH_2` and five `-CH_3` groups
C. two `-CH_2` and four `-CH_3` groups
D. six `CH_3` groups

Answer

D

Explanation

Two quaternary carbons can be at terminal
`H_3C-undersetoverset(|)(CH_3)oversetunderset(|)(CH_3)(C)-undersetoverset(|)(CH_3)oversetunderset(|)(CH_3)(C)-CH_3`
By structure two `(CH_3)_3C` - are joined by C - C bond.
Thus , `C_8H_18 " is " H_3C - H_3C-undersetoverset(|)(CH_3)oversetunderset(|)(CH_3)(C)-undersetoverset(|)(CH_3)oversetunderset(|)(CH_3)(C)-CH_3`
it has six methyl groups