Which one of the following statements is incorrect $?$

• A
  Atomic hydrogen is produced when $H_2$ molecules at a high temperature are irradiated with $UV$ radiation.
• B
  At around $2000 \ K$,the dissociation of dihydrogen into its atoms is nearly $8.1 \ \%$.
• C
  Bond dissociation enthalpy of $H_2$ is highest among diatomic gaseous molecules which contain a single bond.
• D
  Dihydrogen is produced on reacting zinc with $HCl$ as well as $NaOH_{(aq)}$.