Question:
Which of the following compounds forms starch on polymerization?
Which of the following compounds forms starch on polymerization?
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Starch is a polymer of alpha-D-glucose, while cellulose is a polymer of beta-D-glucose.
Updated On: Oct 1, 2026
- \(α\)-D-glucose.
- \(β\)-D-glucose.
- \(α\)-L-glucose
- \(β\)-L-glucose
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Starch has two parts: amylose and amylopectin. Both are built from \(\alpha\)-D-glucose units joined by glycosidic links.
Step 2: Details:
Amylose has \(\alpha\)-1,4 links in a long unbranched chain. Amylopectin also has \(\alpha\)-1,6 links at branch points.
Step 3: Other options:
\(\beta\)-D-glucose forms cellulose. L-glucose is not found in natural polysaccharides. So B, C and D are wrong.
Final Answer:
Starch is formed from \(\alpha\)-D-glucose, option (A). \[ \boxed{\alpha\text{-D-glucose}} \]
Starch has two parts: amylose and amylopectin. Both are built from \(\alpha\)-D-glucose units joined by glycosidic links.
Step 2: Details:
Amylose has \(\alpha\)-1,4 links in a long unbranched chain. Amylopectin also has \(\alpha\)-1,6 links at branch points.
Step 3: Other options:
\(\beta\)-D-glucose forms cellulose. L-glucose is not found in natural polysaccharides. So B, C and D are wrong.
Final Answer:
Starch is formed from \(\alpha\)-D-glucose, option (A). \[ \boxed{\alpha\text{-D-glucose}} \]
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