Which of the following yields both alkane and alkene?

Sodium ethanoate on heating with soda lime gives '$X$'. Electrolysis of aqueous solution of sodium ethanoate gives '$Y$'. '$X$' and '$Y$' respectively are

$4.3 \ g$ of an alkane is burnt in sufficient oxygen. The $CO_2$ formed reacts completely with $300 \ mL, 2 \ N \ NaOH$ solution producing $Na_2CO_3$. The alkane is:

Identify the major product $Y$ in the following reaction sequence:
$CH_3-CH(CH_3)-CH_2-Cl$ $\xrightarrow[\text{dry ether}]{Na} X$ $\xrightarrow[\text{monobromination}]{Br_2/h\nu} Y$ (major)

Photochemical chlorination of alkane is initiated by a process of

Isobutyl magnesium bromide with dry ether and absolute alcohol gives