conditions for elimination and nucleophilic substitution

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Bertybassett
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Hi, the conditions for elimination and nucleophilic substitution have always confused me. I thought that for elimination to predominantly occur, you use alcohol/ethanol as a solvent, yet why in nucleophilic substitution with nh3 do you use ethanolic ammonia? Similarly, for substitution with cn-, why is it alcoholic? are these exemptions you just have to learn?
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mqb2766
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??? f38 - maths ???
(Original post by Bertybassett)
Hi, the conditions for elimination and nucleophilic substitution have always confused me. I thought that for elimination to predominantly occur, you use alcohol/ethanol as a solvent, yet why in nucleophilic substitution with nh3 do you use ethanolic ammonia? Similarly, for substitution with cn-, why is it alcoholic? are these exemptions you just have to learn?
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Untamed-child
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(Original post by Bertybassett)
Hi, the conditions for elimination and nucleophilic substitution have always confused me. I thought that for elimination to predominantly occur, you use alcohol/ethanol as a solvent, yet why in nucleophilic substitution with nh3 do you use ethanolic ammonia? Similarly, for substitution with cn-, why is it alcoholic? are these exemptions you just have to learn?
i am not sure what you are asking but for

nucleophilic substitution with NH3- ethanolic ( basically alcoholic) ammonia is used to prevent the minor products from forming as the n-h bond is polar and n is more electronegative so the lone pair can be attracted to other carbons as substitution can at different points not just at the c-X bond (x being the halogen). and plus because ammonia is in solution there are ions that could interfere with the reaction so that's why alcoholic conditions are used in this case as well as for the cn- ion

I don't know if that makes sense and it depends what exam you are doing

hope this helped
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