d (d) $\alpha$ -helix structure is formed when the chain of $\alpha$ -amino acid coil as a right handed screw because of the formation of hydrogen bonds between amide groups of the same peptide chain i.e., $NH$ group in one unit is linked to carbonyl oxygen of the third unit by hydrogen bonding. This $H-$ bonding is responsible for holding helix in a position.
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A polysaccharide ' $X$ ' on boiling with dil $H _{2} SO _{4}$ at $393 \,K$ under $2-3 \,atm$ pressure yields ' $Y$ '. ' $Y$ ' on treatment with bromine water gives gluconic acid. ' $X$ ' contains $\beta$-glycosidic linkages only. Compound ' $X$ ' is ..... .