At the end of the experiment, when no more propene is being produced, the delive

Question

At the end of the experiment, when no more propene is being produced, the delivery tube is removed from the water before the apparatus is allowed to cool. Suggest why this done. The material labelled X can be broken crockery, broken brick or pumice. Give the chemical formula of a compound that is present in one of these materials. State another reagent that could be used to produce propene from an alcohol. Give the structural formula of the organic product formed when propene reacts separately with each of the following substances. bromine cold, dilute manganate(VII) ions hot, concentrated manganate (VIl) ions

Explanation / Answer

(i) Before cooling the reaction, the exit end of tube is removed from water once no more propene is evolved. This is done to avoid any back suck of water into the reaction due to the backpressure which might develop while cooling the reaction.

(ii) The material X can be,

Chemical formula : SiO2

(iii) Conc. H2SO4

(c) Reaction sof propene

(i) given below is the vicinal dibromide product formed by addition reaction of Br2 on propene.

CH3CH(Br)CH2Br

(ii) given below is the vicinal diol formed by reactio of propene with cold, dil. Mn(VII) ion.

CH3CH(OH)CH2OH

(iii) given below is the oxidized product of propene formed by reaction of it with hot, conc. Mn(VII) ion.

CH3COOH

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