More than three million carbon compounds have been discovered in the field of chemistry. The diversity of…

More than three million carbon compounds have been discovered in the field of chemistry. The diversity of these compounds is due to the capacity of carbon atoms for bonding with one another as well as with other atoms. Most of the carbon compounds are poor conductors of electricity and have low melting and boiling points. (a) Write the molecular formula of first two members of homologous series having functional group –Br. [1] (b) Given below are the formulae of some functional groups : (i) and (ii). Write the name of these functional groups. [1] (c) What would be observed on adding a 5% alkaline potassium permanganate drop by drop to some warm ethanol taken in a test tube ? State the role of KMnO4 in the reaction and write the chemical equation for the reaction involved. [2] Figure

Solution

(a) CH3Br C2H5Br (b) (i) Aldehyde (ii) Ketone (c) The colour of KMnO4 disappears; KMnO4 acts as an oxidizing agent. CH3CH2OH $\xrightarrow{\text{(Alkaline KMnO4 + Heat)}}$ CH3COOH

Asked in: CBSE

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