Give reasons for the following: (i) Ethyl iodide undergoes S_(N^2) reactions faster than etheyl bromide. (ii) (pm) 2 - Butanol is optically inactive. (iii) C - Xbond lengthin halobenzene is smaller than C -X bond length inCH_3-X.

Give reasons for the following: (i) Ethyl iodide undergoes S_(N^2) re

1.	Give reasons for the following: (i) Ethyl iodide undergoes S_(N^2) reactions faster than etheyl bromide. (ii) (pm) 2 - Butanol is optically inactive. (iii) C - Xbond lengthin halobenzene is smaller than C -X bond length inCH_3-X.
Answer» Solution :(i) Because in ethyl iodide, `(I^(-))` being the best leaving group among all the halide ions. RATE of `S_(N^2)` REACTION `prop` ability of leaving group. (ii) `(pm)` 2 -butanol is a recemicmixture which is optically inactive DUE to the EXTERNAL compensation. (iii) Due to resonance in halobenzene, it has a SMALLER bond length value as compared to `CH_3-X`.