Q.

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason(R).


Assertion (A): ketoses give seliwanoff ‘s test faster than aldoses.
Reason(R): ketoses undergo  β elimination followed by formation of furfural. 

In the light of the above statements, choose the correct answer from the options given below:

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a

(A) is false but (R) is true

b

Both (A) and (R) are true but (R) is not the correct explanation of (A)

c

Both (A) and (R) are true and  (R) is the correct explanation of (A)

d

 (A) is true but (R) is false

answer is C.

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Detailed Solution

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Seliwanoff’s reagent is a mixture of resorcinol and Conc. HCl. This test is used to distinguish Ketoses from other Sugars. Only ketoses can produce furfurals which from coloured complexes.

Seliwanoff 's test is a differentiating test for Ketose and aldose. This test relies on the principle that the keto hexose are more rapidly dehydrated to form 5-hydroxy methyl furfural when heated in acidic medium which on condensation with resorcinol, Cherry red or brown red coloured complex is formed rapidly indicating a positive test.

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