In which of the following substances is the carbon atom arranged in a regular tetrahedral structure?

When sodium reacts with ethyl iodide,which of the following hydrocarbons is produced?

Which of the following is not linked with methane?

On mixing an alkane with chlorine and irradiating with ultra-violet light, it forms only one mono-chloro-alkane. The alkane is

Select the reaction$(s)$ that would result in the formation of $2-$bromopropane.
$(I) \ CH_3-CH=CH_2 + HBr \xrightarrow{\text{peroxide}}$
$(II) \ CH_3-CH=CH_2 + HBr \xrightarrow{CCl_4}$
$(III) \ CH_3-CH_2-CH_3 + Br_2 \xrightarrow{hv}$
$(IV) \ CH_3-CH=CH_2 + Br_2 \xrightarrow{CCl_4}$

Which of the following products is $NOT$ formed by the reaction between methane and chlorine in the presence of sunlight?