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# The helical structure of protein is stabilised by

$\begin {array} {1 1} (A)\;Peptide\: bonds & \quad (B)\;Dipeptide\: bonds \\ (C)\;Hydrogen \: bonds & \quad (D)\;vanderwalls\: forces \end {array}$

The alpha helix ($\alpha$ -helix) is a common secondary structure of proteins and is a right-handed coiled or spiral conformation (helix), in which every backbone $N-H$ group donates a hydrogen bond to the backbone $C=O$ group of the amino acid four residues earlier ( $i+4 \rightarrow i$ hydrogen bonding). This secondary structure is also sometimes called a classic Pauling–Corey–Branson alpha helix
Ans : (C)