Carbon black,which is used in making printer's ink,is obtained by decomposition of

Which of the following reactions is expected to readily give a hydrocarbon product in good yields?

When the fuel mainly contains ...............,knocking occurs more in the engine.

Which of the following reagents is used for the following reaction?
$CH_{3}CH_{2}CH_{3} \stackrel{?}{\longrightarrow} CH_{3}CH_{2}CHO$

$Ph^{-}MgCl \xrightarrow{\text{Hydrolysis}} \text{Product}$
Product will be

Which of the following compounds is insoluble even in hot concentrated $H_2SO_4$?