Identify the incorrect statement from the following

In α-helical structure, the -NH- group of one amino acid residue is hydrogen bonded to -CO- of the other amino acid residue of adjacent turn of the same polypeptide chain

In β-pleated structure, all peptide chains are streched out to nearly maximum extension

In β-pleated structure, peptide chains are laid side by side and held together by inter molecular hydrogen bonding

In α-helical structure, polypeptide chain forms all possible hydrogen bonds by twisting into a left handed screw(helix)