The statements regarding Diborane are

i) ${\mathrm{B}}_2{\mathrm{H}}_6$ is stable in the absence of grease and moisture at low temperature

ii) Diborane burns in oxygen to produce a very high temperature

iii) Borazole contains ionic bonds

• The statement ${\mathrm{B}}_2{\mathrm{H}}_6$ is stable in the absence of grease and moisture at low temperature is correct.
• Diborane burns in oxygen to produce a very high temperature. The reaction is given below:

                              ${\mathrm{B}}_2{\mathrm{H}}_6 + {\mathrm{O}}_2 \to {\mathrm{B}}_2{\mathrm{O}}_3 + {\mathrm{H}}_2\mathrm{O}$

• The structure of borazole is given below:

So, only statement i and ii are correct.