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Answer the following.

How will you convert the following: (Give balanced equation) Benzoyl chloride to benzaldehyde…

Chemistry20203 marksConversion
How will you convert the following: (Give balanced equation)
(i)[1.0]
Benzoyl chloride to benzaldehyde.
(ii)[1.0]
Methyl chloride to acetic acid.
(iii)[1.0]
Acetic acid to methane.

Answer

Answer (i)

AI

Equation: $\mathrm{C_{6}H_{5}COCl} + \mathrm{H_{2}} \xrightarrow{\text{Pd}\text{ }\text{/}\text{ }\mathrm{BaSO_{4}}} \mathrm{C_{6}H_{5}CHO} + \mathrm{HCl}$

Rosenmund reduction: hydrogenation of benzoyl chloride over palladium on barium sulphate.

Answer (ii)

AI

Equations: $\mathrm{CH_{3}Cl} + \mathrm{KCN} \xrightarrow{\text{alcoholic}\text{ }\text{KCN}} \mathrm{CH_{3}CN} + \mathrm{KCl}$ $\mathrm{CH_{3}CN} + 2\mathrm{H_{2}O} \xrightarrow{\text{H+}\text{,}\text{ }\text{heat}} \mathrm{CH_{3}COOH} + \mathrm{NH_{3}}$

Methyl chloride is converted to methyl cyanide, which is hydrolysed to acetic acid.

Answer (iii)

AI

Equations: $\mathrm{CH_{3}COOH} + \mathrm{NaOH} \longrightarrow \mathrm{CH_{3}COONa} + \mathrm{H_{2}O}$ $\mathrm{CH_{3}COONa} + \mathrm{NaOH} \xrightarrow{\text{CaO}\text{,}\text{ }\text{heat}} \mathrm{CH_{4}} + \mathrm{Na_{2}CO_{3}}$

Acetic acid is neutralised to sodium acetate, which is heated with soda lime (decarboxylation) to give methane.
Aldehydes and Ketones

From ISC 2020 Chemistry Paper 1, question 13(a).

Check your working with the Chemical equation balancer: balance any equation, ionic and redox ones too, with the atom count on each side.