Answer 1

The substances where carbon can exhibit oxidation states from –4 to +4 are listed in the following table.

Substance	O.N. of carbon
CH2Cl2	0
ClC≡CCl	+1
HC≡CH	–1
CHCl3, CO	+2
CH3Cl	–2
Cl3C – CCl3	+3
H3C – CH3	–3
CCl4, CO2	+4
CH4	–4

The substances where nitrogen can exhibit oxidation states from –3 to +5 are listed in the following table

Substance	O.N. of nitrogen
N2	0
N2O	+1
N2H2	–1
NO	+2
N2H4	–2
N2O3	+3
NH3	–3
NO2	+4
N2O5	+5