Assertion: Cellulose does not give I_2 test.R | vedclass

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Question

(A) The iodine test ($I_2$ test) is used to detect the presence of starch. Starch consists of amylose and amylopectin. Amylose is a helical molecule t

Vedclass · Accepted Answer

Both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.

Vedclass · Answer

(A) The iodine test ($I_2$ test) is used to detect the presence of starch. Starch consists of amylose and amylopectin. Amylose is a helical molecule that can hold $I_2$ molecules in its helical structure,producing a blue-black color.Cellulose is a linear polymer of $\beta$-$D$-glucose units linked by $\beta(1 \rightarrow 4)$ glycosidic bonds. Due to its linear structure,it does not form complex helices like starch.Because it lacks these helices,cellulose cannot trap $I_2$ molecules and therefore does not give a positive iodine test.Thus,both the Assertion and the Reason are true,and the Reason correctly explains why cellulose does not give the $I_2$ test.

Assertion: Cellulose does not give $I_2$ test.
Reason: Cellulose does not contain complex helices.

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Assertion: Cellulose does not give $I_2$ test.Reason: Cellulose does not contain complex helices.