For the octahedral complexes of Fe³⁺ in SCN^$$-$$ (thiocyana-to-S) and in CN^$$-$$ ligand environments, the difference between the spin-only magnetic moments in Bohr magnetons (when approximated to the nearest integer) is __________.

[Atomic number Fe = 26]

Compound(s) that on hydrogenation produce(s) optically inactive compound(s) is(are)

The major product of the following reaction is

In the following reaction, the major product is