Question

The probability factor for the replacement of hydrogen atom during chlorination/bromination is

• A. more important in chlorination
  
• B. more important in bromination
  
• C. equally important in chlorination/bromination
  
• D. not definite

Answer 1

The correct option is A

more important in chlorination

More is the reactivity of a free radical, lesser is its selectivity for different type of H atoms ( $1^{\circ },2^{\circ },or{3}^{\circ }$ ) and hence the praobability factor will be more in such reagent. Since Cl is more reactive, it is less selective and hence it will be more influeneced by the probability factor.