Leaving groups and rates of nucleophilic substitution

Predict and explain the relative rates of substitution for chloroalkanes, bromoalkanes and iodoalkanes: the weaker the carbon-halogen bond and the more stable the leaving anion, the faster the reaction, so iodoalkanes react fastest.

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Zadanie 39Paper 1A, maj 2026
wzorowane1 pktzamknięteśrednie (szac.)

Which reaction will be fastest when a halogen is substituted by aqueous hydroxide ions? A. (CHX3)X2C(F)CHX2CHX2CHX3\ce{(CH3)2C(F)CH2CH2CH3} B. (CHX3)X2C(Cl)CHX2CHX2CHX3\ce{(CH3)2C(Cl)CH2CH2CH3} C. (CHX3)X2C(Br)CHX2CHX2CHX3\ce{(CH3)2C(Br)CH2CH2CH3} D. (CHX3)X2C(I)CHX2CHX2CHX3\ce{(CH3)2C(I)CH2CH2CH3}

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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