SN1 and SN2 nucleophilic substitution

Describe and explain the one-step SN2 mechanism of primary halogenoalkanes (backside attack through a transition state, second order rate) and the two-step SN1 mechanism of tertiary halogenoalkanes via a carbocation (first order), drawing both with curly arrows.

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Zadanie 1dPaper 2, maj 2025, TZ2
wzorowane4 pktotwarteśrednie (szac.)

Cyanide ions react with bromoethane, CHX3CHX2Br\ce{CH3CH2Br}. (i) Draw the full structural formula of the organic product of this reaction. (ii) Predict which mechanism, SN1\mathrm{S_N1} or SN2\mathrm{S_N2}, operates in this reaction, and give a reason for your choice.…

Zadanie 3cPaper 2, listopad 2025, TZ1
wzorowane11 pktotwartetrudne (szac.)

(i) Concentrated sulfuric acid, HX2SOX4\ce{H2SO4}, is used as the catalyst in the manufacture of propyl ethanoate. Explain how the catalyst affects the reaction. (ii) The conversion of propane into 1-bromopropane, CX3HX8(g)+BrX2(g)CHX3CHX2CHX2Br(g)+HBr(g)\ce{C3H8(g) + Br2(g) -> CH3CH2CH2Br(g) + HBr(g)}

Zadanie 4cPaper 2, listopad 2025, TZ3
wzorowane9 pktotwartetrudne (szac.)

Iodoethane can react with aqueous hydroxide ions to produce ethanol. CHX3CHX2I(l)+OHX(aq)CHX3CHX2OH(aq)+IX(aq)\ce{CH3CH2I(l) + OH-(aq) -> CH3CH2OH(aq) + I-(aq)} (i) State what type of reaction this is. (ii) Using curly arrows to show the movement of electron pairs, sketch the mechanism of this…

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