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 p – elimination followed by formation of furfural. In the light of the above statements, choose the correct answer from the options given below :
Select the correct option:
A
(A) is false but (R) is true
B
Both (A) and (R) are true and (R) is the correct explanation of (A)
C
(A) is true but (R) is false
D
Both (A) and (R) are true but (R) is not the correct explanation of (A)
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
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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