NEETBotanyBiomolecules (B)
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): A linear polysaccharide composed of 10 glucose ( C ₆ H ₁₂ O ₆ ) molecules has the chemical formula C ₆₀ H ₁₀₂ O ₅₁ . Reason (R): In a polysaccharide chain, the right end is called the reducing end and the left end is called the non-reducing end. In the light of the above statements, choose the most
Options
- ABoth (A) and (R) are correct and (R) is the correct explanation of (A)
- BBoth (A) and (R) are correct but (R) is not the correct explanation of (A)
- C(A) is correct but (R) is not correct
- D(A) is not correct but (R) is correct
Correct answer
B. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
Step-by-step solution
Assertion (A) is correct. A linear polysaccharide of 10 glucose molecules will have 9 glycosidic bonds. Since each bond formation releases one water molecule ( H ₂ O ), 9 water molecules ( H ₁₈ O ₉ ) are lost. Total atoms before dehydration: 10 C ₆ H ₁₂ O ₆ = C ₆₀ H ₁₂₀ O ₆₀ . After subtracting 9 water molecules: C ₆₀ H ₁₂₀ O ₆₀ - H ₁₈ O ₉ = C ₆₀ H ₁₀₂ O ₅₁ . Reason (R) is also correct. According to NCERT, in a polysaccharide chain (like glycogen), the right end is the reducing end and the left end is the non-reduc