What is the molecular formula of undecane?

Which free radicals are obtained on anode and cathode during electrolysis of $RCOO^{-}Na^{+}$ in Kolbe's electrolysis?

In the reaction $CH_3-Br + 2Na + Br-CH_3 \to$,the product is called

$n$-Butane on monochlorination under photochemical conditions gives an optically active compound "$P$". "$P$" on further chlorination gives dichloro compounds. The number of dichloro compounds obtained (ignore stereoisomers) is:

The compound having only primary hydrogen atoms is

With which of the following substances does $CH_2N_2$ (diazomethane) react differently?