C $$-$$ N bond length in proteins is longer than usual bond length of N $$-$$ C bond.

Spectroscopic analysis shows planar structure of group.

C $$-$$ N bond length in proteins is smaller than usual bond length of C $$-$$ N bond.

None of the above.

A $$-$$ T, G $$-$$ C

A $$-$$ G, T $$-$$ C

G $$-$$ T, A $$-$$ C

A $$-$$ A, T $$-$$ T

Cycloheptane is an aromatic compound.

Diastase is an enzyme

Acetophenone is an ether.

All of these.

Thyroxine

Adrenaline

Oestrogen

Progesterone