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(i) Suggest a simple chemical test to distinguish propane and propane. (ii) Write a notes on Wurtz-fitting reaction. |
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Answer» Solution :(i) CHEMICAL test to DISTINGUISH between propane and propene Bromine WATER test: Propene contains double bond, therefore when we pour the bromine water to propene sample, it decolourises the bromine water whereas propane which is a saturated hydrocarbon does not decolourise the bromine water. Baeyer.s test: When propene reacts with Bayer.s reagent it gives 1,2 dihydroxypropene. Propane does not react with Baeyer.s reagent. (a) `underset("Propene")(CH_(3)-CH=CH_(2))underset(H_(2)O,(O))overset(KMnO_(4)|Ooverset(Theta)(H))tounderset(("1,2-dihydroxy propene"))(CH_(3)-underset(OH)underset(|)(C)H-underset(OH)underset(|)(C)H_(2)` (b) `underset("Propene")(CH_(3)-CH_(2)-CH_(3))underset(H_(2)O,(O))overset(KMnO_(4)|Ooverset(Theta)(H))to`No reaction (ii) When a solution of bromobenzene and iodomethane in dry ether is treated with metallic sodium, toluene is formed. `underset(("Bromo benzene"))(C_(6)H_(5)Br)+2Na+underset("Iodomethane")(ICH_(3))overset("dry ether")to underset(("Toluene"))(C_(6)H_(5)CH_(3))+NaBr+NaI` |
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