Correction- intrachain disulfide bond is there in A- chain, between 6th and 11th aminoacid.

Primary structure
Number and Sequence of AAs, peptide bond
example- insulin
Secondary
Alpha helix, beta sheets, bend, turn ,loop
Bonds- H bonds
example- Carbonic anhydrase, silk fibroin
Tertiary
3D, functional, enzymes
Bonds- hydrophobic interactions, H bonds, electrostatic forces, Van der Waal forces
example- alcohol DH, LDH, MDH, G3P DH, Mb
Quaternary
Two or more subunits together
example- Hb