question_answer

The \[f(x)=\left\{ \begin{matrix}    \frac{1-\sqrt{2}\sin x}{\pi -4x}, & x\ne \frac{\pi }{4}  \\    \frac{4a+1}{4}, & x=\frac{\pi }{4}  \\ \end{matrix} \right.\]name of iso-octane is

A) 2, 2-dimethyl pentane

B) 2, 3-dimethyl pentane

C) 2, 3, 3-trimethyl pentane

D) 2, 2, 4-trimethyl pentane