Q54 of 60 Page 36

How would you bring about the following conversions? Name the process and write the reaction involved.

(a) ethanol to ethene.


(b) propanol to propanoic acid.


Write the reactions.

(a) Ethanol is dehydrated in the presence of concentrated sulphuric acid to obtain ethene.


This can be shown by the following equation:


CH3CH2OH + conc. H2SO4→ CH2=CH2 + H2O


(b) Propanol is oxidised by an oxidizing agent potassium permanganate to obtain propanoic acid.


This can be shown by the following equation:


CH3CH2CH2OH + alkaline KMnO4→ CH3CH2OOH


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52

A compound C (molecular formula, C2H4O2) reacts with Na metal to form a compound R and evolves a gas which burns with a pop sound. Compound C on treatment with an alcohol A in presence of an acid forms a sweet smelling compound S (molecular formula, C3H6O2). On addition of NaOH to C, it also gives R and water. S on treatment with NaOH solution gives back R and A. Identify C, R, A, S and write down the reactions involved.

 53

Look at figure given below and answer the following questions.


(a) What change would you observe in the calcium hydroxide solution taken in tube B?


(b) Write the reaction involved in test tubes A and B respectively.


(c) If ethanol is given instead of ethanoic acid, would you expect the same change?


(d) How can a solution of lime water be prepared in the laboratory?


 55

Draw the possible isomers of the compound with molecular formula C3H6O and also give their electron dot structure.

 56

Explain the given reactions with the examples

(a) Hydrogenation reaction

(b) Oxidation reaction

(c) Substitution reaction

(d) Saponification reaction

(e) Combustion reaction