1. Tardigrade
  2. Question
  3. Chemistry
  4. Pick out the incorrect statement(s) from the following 1. Glucose exists in two different crystalline forms, α-D-glucose and β-D-glucose 2. α-D-glucose and β-D-glucose are anomers 3. α-D-glucose and β-D-glucose are enantiomers 4. Cellulose is a straight chain polysaccharide made of only β-D-glucose units 5. Starch is a mixture of amylose and amylopectin, both contain unbranched chain of α-D-glucose units

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Q. Pick out the incorrect statement(s) from the following
1. Glucose exists in two different crystalline forms, $ \, \, \, \alpha$-D-glucose and $\beta$-D-glucose
2. $\alpha$-D-glucose and $\beta$-D-glucose are anomers
3. $\alpha$-D-glucose and $\beta$-D-glucose are enantiomers
4. Cellulose is a straight chain polysaccharide made of $ \, \, \, $only $\beta$-D-glucose units
5. Starch is a mixture of amylose and amylopectin, both $ \, \, \, $contain unbranched chain of $\alpha$-D-glucose units

KEAMKEAM 2008Biomolecules

Solution:

$\alpha$-D-glucose and $\beta$-D-glucose differ in the orientation of .Hand OH-groups around first carbon atom. Such isomers are called anomers not enantiomers. Starch is a mixture of amylose and amylopectin but amylose is a straight chain polymer of $\alpha$-D-glucose while amylopectin is a branched chain polymer of $\alpha$-D-glucose.