Question

Which of the following does not exist in free form?

• A. $B{F}_3$
• B. $B{H}_3$
• C. $BC{l}_3$
• D. $BB{r}_3$

Answer 1

Answer: (B)

Boron forms hydrides with general formula $B_n{H}_{n+4}$ but $B{H}_3$ exists as $B_2{H}_6$.