False statement among the  following is

• A

   Formula of  colourless transparent Borax bead is   ${\mathrm{NaBO}}_2+{\mathrm{B}}_2{\mathrm{O}}_3$

• B

  Orthoboric acid has layered structure

• C

  Diborane on methylation gives  ${\mathrm{B}}_2{\left({\mathrm{CH}}_3\right)}_6$

• D

  Diborane undergoes cleavage and forms adduct with CO