Chlorine is one of the elements in Group 17 of the Periodic Table. $$$\mathrm{CHCl}_{3}$$$ is another halogenoalkane. $$$\mathrm{CHCl}_{3}$$$ forms when propanone reacts with NaClO . NaClO is made from chlorine in a disproportionation reaction. (i) Identify a reagent and conditions that can be used to convert chlorine to NaClO . ................................................................................................................................. (ii) Define disproportionation. ....................................................................................................................................... . ................................................................................................................................. (iii) Write numbers in the boxes to balance the equation showing the reaction of propanone with NaClO . (iv) Aqueous $$$\mathrm{AgNO}_{3}$$$ dissolved in ethanol reacts with an aqueous solution of $$$\mathrm{CHCl}_{3}$$$. State what is observed in this reaction. Explain your answer. ....................................................................................................................................... . ....................................................................................................................................... . .................................................................................................................................

Chemistry

IGCSE&ALevel

CAIE

Exam No：9701_w24_qp_21 Year：2024 Question No：2(c)

Answer:

Knowledge points:

11.4.1 describe and interpret, in terms of changes in oxidation number, the reaction of chlorine with cold and with hot aqueous sodium hydroxide and recognise these as disproportionation reactions

11.4.2 explain, including by use of an equation, the use of chlorine in water purification to include the production of the active species HOCl and which kill bacteria.

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Knowledge points:

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