Question

the rate of SN1 reaction is not dependent on the nature of nucleophile whereas SN2 reaction it depends justify your answer​

Answer 1

Answer:You cant say that a nucleophile should be weak or strong for Sn1 reaction. It does depend per concentration and the nature

Take the text book example case of Tert Butyl Bromide with OH- ion

if you have higher concentration of OH- Ion, then elimination is bound to take place rather than substitution, because the main predominance of A Hydroxyl ion is to seek a Hydrogen ion. Proton abstraction will go over substitution

If you have lesser concentration of OH-, then, The formation of Carbocation is preferred, then the substitution takes place, because OH- cant drive the rate of the reaction, and as a result, substitution is favored over elimination

Now coming for the Nature of a nucleophile

A strong Nucleophile is bound to take precedence of completing it’s own charge deficiency rather than filing in for Carbon valency

At the arbitrary concentration of Ethoxide ion and Hydroxyl ion, The ethoxide ion would prefer to get a positive charge to become a neutral alcohol molecule rather than to attach itself in a carbon chain, which may get sterically hindered and overall stability might be in question. Thus the ethoxide ion would actively look for a Hydrogen ion thus giving a cause for elimination

Conversely, OH- being a smaller ion than ethoxide, would easily fit in a carbon chain and less steric hindrance is bound to occur.

In short, the Nature and Concentration, does affect Sn1 reaction, and a weaker Nucleophile will have a greater chance of substitution rather than an elimination

Explanation: hope this helps