# Which of following are necessary for successful collisions to occur? </br> (i) Favourable collision geometry </br> (ii) sufficient kinetic energy </br> (iii) Large $\Delta H$ </br>

$\begin{array}{1 1}(a)\;(i)\;only\\(b)\;(i)\;and\;(ii)\;only\\(c)\;(ii)\;and\;(iii)\;only\\(d)\;(i),(ii),(iii)\end{array}$

Successful collisions only depends on kinetic & orientation of collision.
Hence (b) is the correct answer.