Which of the following is most covalent?

1. \(AlF_3\)

2. \(AlCl_3\)

3. \(AlBr_3\)

4. \(AlI_3\)

Among LiCl, BeCl₂, BCl₃ and CCl₄, the covalent bond character follows the order-

1. LiCl < BeCl₂ > BCl₃ > CCl₄

2. LiCl > BeCl₂ < BCl₃ < CCl₄

3. LiCl < BeCl₂ < BCl₃ < CCl₄

4. LiCl > BeCl₂ > BCl₃ > CCl₄

The dipole moment of toluene is 0.36 D. The dipole moment of o-xylene would be

1.  0.0 D

2.  0.36 D

3.  0.62 D

4.  0.92 D

A molecule among the following with non-zero dipole moment is:

1. ${\mathrm{C}}_6{\mathrm{Cl}}_6$

2. ${\mathrm{C}}_2{\mathrm{Cl}}_6$

3. $\mathrm{C}{\left({\mathrm{CCl}}_3\right)}_4$

4. $:{\mathrm{CCl}}_2$

Both ${\mathrm{CN}}^{-} \mathrm{and} {\mathrm{N}}^2$ isoelectronic but in contrast to ${\mathrm{CN}}^{-} , {\mathrm{N}}^2$ is chemically inert due to

1.  Unsymmetrical electron distribution

2.  Low bond energy

3.  The pressure of a greater number of electrons in bonding orbitals

4.  Absence of bond polarity

The relative Lewis acid strength of boron trihalide is in the order

1.  $BB{r}_3 > BC{l}_3 > B{F}_3$

2.  $BC{l}_3 > B{F}_3 > BB{r}_3$

3.  $B{F}_3 > BC{l}_3 > BB{r}_3$

4.  $B{F}_3 > BB{r}_3 > BC{l}_3$

In $P_4$ (Tetrahedral) molecule

1.  Each P is joined to four P

2.  Each P is joined to three P

3.  Each P is joined to two P

4.  $P_4$ does not exist

molecular shapes of ${\mathrm{SF}}_4, {\mathrm{CF}}_4 \mathrm{and} \mathrm{XeF}$₄ are 

1.  Same with 2, 0 and 1 lone pairs of electrons respectively

2.  The same with 1, 1 and 1 lone pairs of electrons respectively 

3.  Different with 0, 1 and 2 lone pairs of electrons respectively 

4.  Different with 1, 0 and 2 lone pairs of electrons respectively

Correct regarding edges and faces in $l{F}_7$ respectively 

1.  15, 10

2.  10, 10

3.  7, 15

4.  15, 7

Electronegativity of A and B is 1 and 4 respectively. The percentage of the covalent character of AB is

1.  79.5%

2.  8%

3.  20.5%

4.  25%