How many of the following statements are correct ?
(v) D–Glucose , D-Mannose and D-Fructose form same osazone .
(vi) Ala-Gly and Gly-Ala are enantiomer
(vii) Ala-Phe–Gly is having more M.w. than Ala-Gly-Ala
(viii) Iso-electric point (PI) of Glycine is more than aspartic acid
(ix) Monomer unit of starch is α-D glucose.

Question

How many of the following statements are correct ?

(v) D–Glucose , D-Mannose and D-Fructose form same osazone .

(vi) Ala-Gly and Gly-Ala are enantiomer

(vii) Ala-Phe–Gly is having more M.w. than Ala-Gly-Ala

(viii) Iso-electric point (PI) of Glycine is more than aspartic acid

(ix) Monomer unit of starch is α-D glucose.

TestHub · Accepted Answer

Structures i/ii have free anomeric hemiacetals, allowing mutarotation/reduction. iii has the stated C1-C4 linkage. iv marks -CONH-, not a free amino group, and is ninhydrin-negative. v same D-series osazone is true. vi sequence isomers Ala-Gly/Gly-Ala are not enantiomers. vii Phe peptide is heavier, viii Gly pI exceeds Asp pI, ix starch contains alpha-D-glucose. True i,ii,iii,v,vii,viii,ix: seven.

Chemistry - Biomolecules Question with Solution | TestHub

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