A decapeptide (molecular weight 796) on complete hydrolysis gives glycine (molecular weight 75), alanine and…

A decapeptide (molecular weight 796) on complete hydrolysis gives glycine (molecular weight 75), alanine and phenylalanine. Glycine contributes $47.0 \%$ to the total weight of the hydrolysed products. The number of glycine units present in the decapeptide is

Solution

$ \text { A decapeptide has nine peptide (amide) linkage as } $
Therefore, no hydrolysis, it will absorb nine water molecules. Hence, total mass of hydrolysis product $=796+18 \times 9=958$ $\Rightarrow$ mass of glycine in hydrolysis product $=\frac{958 \times 47}{100}=450$ $\Rightarrow$ number of glycine molecule in one molecule of decapeptide $=\frac{450}{75}=6$

Asked in: JEE Advanced 2011 (Paper 1)

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