Question

Which of the following reaction(s) is/are not possible?
(i) $(C{H}_3{)}_{2}O+B{F}_3\to (C{H}_3{)}_{2}O\to B{F}_3$
(ii) $(Si{H}_3{)}_{2}O+B{F}_3\to (Si{H}_3{)}_{2}O\to B{F}_3$
(iii) $H_{3}N+B{F}_3\to H_{3}N\to B{F}_3$
(iv) $(C{H}_3{)}_{2}O+B{F}_4^{-}\to (C{H}_3{)}_{2}O\to B{F}_4^{-}$

• A. (i) and (ii)
• B. (i), (iii), and (iv)
• C. (ii) and (iv)
• D. (ii) and (iii)

Answer 1

The correct option is C (ii) and (iv)

The reactions (II) and (IV) are not possible. Wheres reactions (i) and (iii) are possible.

In the second reaction, the double bond is present between $Si$ and $O$. In the reaction (iv), all the orbitals of B are occupied. Thus, the formation of a coordination bond is not possible.