There are a few factors that contribute in competition of substitution and elimination reaction on haloalkanes. One of them is the solvent, where water encourages substitution and ethanol encourages elimination.

I don’t understand why water encourages substitution, and why ethanol encourages elimination.

Can you elaborate more on it? Is it because of their chemical properties?

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane