Important Trends and Anomalous Properties of Boron

The elements of the second period in the modern periodic table are given below. Refer the table and answer the questions given below :

What is the valency of Boron?

Identify the correct statements about the anomalous behaviour of Boron

I. Boron trihalides can form dimeric structures.

II. Boron shows $+1$ as stable oxidation state

III. Maximum covalency of Boron is four.

IV. Boron does not form ${\mathrm{BF}}_6^{6-}$ ion.

When ${\mathrm{NH}}_3$ reacts with ${\mathrm{BF}}_3$ then after the reaction

A molecular adduct is formed between ${\mathrm{BF}}_3$ and ${\mathrm{Et}}_2\mathrm{O}.$ Which of the following values describe the coordination number$\left(\mathrm{CN}\right)$, valency $\left(\mathrm{V}\right)$and oxidation state $\left(\mathrm{OS}\right)$of $\mathrm{B}$ atom in this adduct?

Which of these statements is not true ?

${\mathrm{BF}}_3+{\mathrm{LiAlH}}_4\stackrel{\text{ Ether }}{⟶}\mathrm{X}+\mathrm{LiF}+{\mathrm{AlF}}_3$. Which of the following is incorrect about $\mathrm{X}$?

The bond dissociation energy of $\mathrm{B}—\mathrm{F}$ in ${\mathrm{BF}}_3$ is $646 \mathrm{kJ} {\mathrm{mol}}^{-1}$ whereas that of $\mathrm{C}—\mathrm{F}$ in ${\mathrm{CF}}_4$ is $515$ $\mathrm{kJ} {\mathrm{mol}}^{-1}$. The correct reason for higher $\mathrm{B}—\mathrm{F}$ bond dissociation energy as compared to that of $\mathrm{C}—\mathrm{F}$ is

_______ and _______  product are respectively given when BF₃ and CCl₄ on reaction with water ?

Which is the incorrect order of acidic strength?

 Determine the Lewis acidity order of  molecules BF₃, BCl₃, BBr₃.

${\mathrm{Na}}_3{\mathrm{AlF}}_6+{\mathrm{BF}}_3\to ?$

Which of the following is correct about the reaction given above?

Which of the following cannot act as a lewis acid?

Which of the following statements is not true for both B and Al?

Among the following, which is the strongest Lewis acid?

Arrange the following in the correct order of Lewis acidity.

${\mathrm{BF}}_3, {\mathrm{BCl}}_3, {\mathrm{BBr}}_3$

Which of these statements is not true ?

Choose the correct sequence for the geometry of the given molecules Borazone, Borazole, ${\mathrm{B}}_3{\mathrm{O}}_6^{3-}, {\mathrm{Fe}}_2{\mathrm{Cl}}_6$, trimer of FCN.

['P' stands for planar and 'NP' stands for non -planar]

Choose the correct sequence for the geometry of the given molecules borazon, borazole, ${\mathrm{B}}_3{\mathrm{O}}_6^{3-}$, ${\mathrm{Fe}}_2{\mathrm{Cl}}_6$, trimer of $\mathrm{FCN}$.
['$\mathrm{P}$' stands for planar and '$\mathrm{NP}$' stands for non-planar]

Regarding the elements of B family select the correct statements.

Boron cannot form which one of the following anions?