Explain why does a `S_(N^2)` reaction involve an inversion in configuration.

Assertion : SN_(2) reaction of an optically active aryl halide with an aqueous solution of KOH always gives an alcohol with opposite sign of rotation. Reason : S_(N) reactions always proceed with inversion of configuration.

In the following S_(N)2 reaction

(i) Which alkyI hailde from the following pair is chiral and undergoes faster S_(N)2 reaction ? (ii) Out of S_(N)1 and S_(N)2 which reaction occurs with (a) Inversion of configuration (b) Recemisation

Write the reaction involved in N_2 - fixation

Consider the statements for given reaction 1. In the first step, there is breaking of C - O bond 2. The second step is S_(N)2 reaction 3. There is retention of configuration in the first step 4. There is inversion of configuration in the second step

Consider the ollowing statement about SN^(1) reaction (i) it is a bimolecular reaction (ii) it proceeds with retention as well as inversion of the configuration. (iii) It involves the fomrationn of an intermediate cabocation (iv) The reaction is carried in the presence of polar aprotic solvents

Explain why lonic reactions are very fast.