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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 amylase and amylopectin, both contain unbranched chain of $\alpha$-D-glucose units.
Options:
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 amylase and amylopectin, both contain unbranched chain of $\alpha$-D-glucose units.
Solution:
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Verified Answer
The correct answer is:
3 and 5 only
$\alpha$-D-glucose and $\beta$-glucose, differ in the orientation of $-\mathrm{H}$ and $-\mathrm{OH}$ groups are first carbon atom. Such isomers are called anomers.
Starch is a mixture of amylase and amylopectin but amylase is a straight chain polymer while amylopectin is a branched chain polymer of $\alpha$-D-glucose.
Starch is a mixture of amylase and amylopectin but amylase is a straight chain polymer while amylopectin is a branched chain polymer of $\alpha$-D-glucose.
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