Which of the following are `SN^2` reactions ?

Which of the following undergo SN reaction at a fastest rate than others

SN^2 reactions of alkyl halides is a bimolecular reaction which take place through formation of a transition state. The rate of reaction depends on the concentration of alkyl halide and nucleophile.The reaction is favoured by strong nucleophlie in polar aprotic solvents. In which of the following solvents SN^2 reaction is more favourable

Which of the following redox reaction is oxidation and which is reduction? Sn^(4+)2e^(-) to Sn^(2+)

Write the products of the following SN reactions. .

Write the products of the following SN reactions. .

Of the following , which is/are SN2 reactions?

All the following reactions are SN^2 reactions except