Question
Write the structures of A, B, C, D and E in the following reactions:
Or
(a)Write the chemical equation for the reaction involved in Cannizzaro reaction.
(b)Draw the structure of the semicarbazone of ethanal.
(c)Why pKa of F-CH2-COOH is lower than that of Cl−CH2−COOH?
(d)Write the product in the following reaction:
(e)How can you distinguish between propanal and propanone?
Solution
Or
c) Fluorine is more electronegative than chlorine. The presence of fluorine in a molecule will make it more acidic. Thus, the pKa of F−CH2−COOH is lower than that of Cl−CH2−COOH.
d)
e)
d)
e)
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Propanal |
Propanone |
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It forms silver mirror on reaction with Tollen's reagent. |
It is not oxidised by Tollen's reagent. |
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It does not react with iodoform. |
It gives positive iodoform test. |
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On reacting with Schiff's reagent, it gives pink colour. |
It does not react with Schiff's reagent. |
