Poly halogen compounds have a lot of applications and at the same time have harmful effects. False statement about them among the following  is

• A

  ${\mathrm{CCl}}_4 \mathrm{can} \mathrm{be} \mathrm{used} \mathrm{as} \mathrm{fire} \mathrm{extinguisher}$

• B

  ${\mathrm{CHI}}_3 \mathrm{has} \mathrm{objectionable} \mathrm{smell}$

• C

  ${\mathrm{CH}}_2{\mathrm{Cl}}_2 \mathrm{burns} \mathrm{cornea} \mathrm{on} \mathrm{direct} \mathrm{contact} \mathrm{to} \mathrm{eyes}$

• D

  ${\mathrm{CCl}}_2{\mathrm{F}}_2 \mathrm{is} \mathrm{highly} \mathrm{reactive}$