Three moles of $B _2 H _6$ are completely reacted with methanol. The number of moles of boron containing product formed is

The number of neutrons present in the more abundant isotope of boron is ' $\mathrm{x}$ '. Amorphous boron upon heating with air forms a product, in which the oxidation state of boron is ' $y$ '. The value of $x+y$ is ...

Correct Lewis acidity order of $BX_3$ is

The reaction of $\mathrm{H}_{3} \mathrm{N}_{3} \mathrm{B}_{3} \mathrm{Cl}_{3}$ $(A)$ with $\mathrm{LiBH}_{4}$ in tetrahydrofurane gives inorganic benzene $(B)$. Further, the reaction of $(A)$ with $(C)$ leads to $\mathrm{H}_{3} \mathrm{N}_{3} \mathrm{B}_{3}(\mathrm{Me})_{3}$. than Compounds $(\mathrm{B})$ and $(\mathrm{C})$ respectively, are

Which reactions can be used to prepare diborane

$I.\,\,NaBH_4 + BF_3$ (in ether) $\to $

$II.\,\, NaBH_4 + I_2 \to $

$III.\,\, BF_3 + NaH \to $

Boric acid is an acid because its molecule