The major product of the following reaction is

Extra very pure N₂ can be obtained by heating

Among the given options, the compound(s) in which all the atoms are in one plane in all the possible conformations (if any) is(are)

An acyclic hydrocarbon P, having molecular formula C₆H₁₀, gave acetone as the only organic product through the following sequence of reactions, in which Q is an intermediate organic compound.

The structure of compound P is