What is the bond length of the $C-C$ bond in an alkane where all carbon atoms are $sp^{3}$ hybridized (in $pm$)?

Give the conversion reaction for $methane$ to $ethane$.

Rotation around the bond (between the underlined atoms) is not restricted in

What is the minimum quantity (in grams) of methyl iodide required for preparing one mole of ethane by Wurtz reaction?
(Atomic weight of iodine $= 127$)

The addition of tetraethyl lead to petrol:

In which of the following is the $Baeyer$ angular strain maximum?