. The reaction of aldehydes and ketones with sodium bisulphite is a reversible reaction. To ensure maximum possible yield in this reaction

(a). Saturated solution of sodium bisulphite is used.

(b). Unsaturated solution of sodium bisulphite is used.

(c). Cold solution of sodium bisulphite is used.

(d). Hot solution of sodium bisulphite is used.

Ans.(a), Every time some of sodium bisulphate is used it is replaced with fresh amount to keep the solution saturated always.

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