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JEE Advanced 2011Paper 1
Exam
JEE Advanced
Year
2011
Paper
Paper 1
Subject
Chemistry
Chapter
Biomolecules

JEE Advanced 2011 · Paper 1 · Chemistry · Biomolecules

A decapeptide (molecular weight 796) on complete hydrolysis gives...

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

Correct answer

0

Step-by-step solution

 A decapeptide has nine peptide (amide) linkage as <imgsrc="/api/proxy−image?url=https\text{ A decapeptide has nine peptide (amide) linkage as }<img src="/api/proxy-image?url=https%3A%2F%2Ffirebasestorage.googleapis.com%2Fv0%2Fb%2Fquantrexacademy-app.firebasestorage.app%2Fo%2Fquestions%252Ffigs%252Fpyq%252Fjee_advanced%252FQRsCQ14li6NT9gp0NOovuoPzTGcmi68dMG0a74dUtUg.original.fullsize.png%3Falt%3Dmedia&clean=1&v=wm2" data-qx-orig-src="https://firebasestorage.googleapis.com/v0/b/quantrexacademy-app.firebasestorage.app/o/questions%2Ffigs%2Fpyq%2Fjee_advanced%2FQRsCQ14li6NT9gp0NOovuoPzTGcmi68dMG0a74dUtUg.original.fullsize.png?alt=media" data-qx-storage-src="https://firebasestorage.googleapis.com/v0/b/quantrexacademy-app.firebasestorage.app/o/questions%2Ffigs%2Fpyq%2Fjee_advanced%2FQRsCQ14li6NT9gp0NOovuoPzTGcmi68dMG0a74dUtUg.original.fullsize.png?alt=media"> \\ Therefore, no hydrolysis, it will absorb nine water molecules. Hence, total mass of hydrolysis product =796+18×9=958⇒=796+18 \times 9=958\Rightarrow mass of glycine in hydrolysis product =958×47100=450⇒=\frac{958 \times 47}{100}=450\Rightarrow number of glycine molecule in one molecule of decapeptide =45075=6=\frac{450}{75}=6
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