Which of the following compound is planar and non-polar?

(1) $Xe O_4$

(2) $S{f}_4$

(3) $Xe f_4$

(4) $C{f}_4$

The incorrect statement(s) regarding ${\mathrm{CX}}_3$ species is:

(1) If electronegativity of surrounding element 'X' is less than 2.5, then central carbon atom used almost 33% s-character in their hybrid bonding orbitals

(2) If electronegativity of surrounding element 'X' is more than 2.5, then central carbon atom used almost 25% s-character in their hybrid bonding orbitals

(3) If 'X' is 'F', then species should be polar and pyramidal

(4) If 'X' is H, then species should be polar and planar

$H_{2}O$ has a net dipole moment while Be$F_2$ has zero dipole moment because :

(1) F is more electronegativity than oxygen 

(2) Be is more electronegativity than oxygen 

(3) $H_{2}O$ molecule is linear and Be$F_2$ is bent 

(4) $Be{F}_2$ molecule is linear and $H_{2}O$ is bent

Consider following compounds:

(i) $H_{3}X-NCS$   

(ii) $H_{3}Y-NCS$

(iii) ${\left(H_{3}X\right)}_{2}O$

(iv) $(H_{3}Y{)}_{2}O$

The correct statement regarding given compound is:

(a) If Y is carbon in compounds (ii) and (iv), then both are bent 

(b) If X is silicon in compounds (i) and (iii), then both are linear 

(c) If X is carbon and Y is silicon then compound (i) is more basic than compound (iii)

(d) If X is silicon and Y is carbon then X-O-X bond angle compounds (iii) is greater than Y-O-Y bond angle in compunds (iv)

Which of the following overlops is incorrect (assuming Z axis internuclear axis)?

(A) $2p_{y }+2p_y\to \pi ‐Bond formation$        (B) $2p_x+2p_x\to \sigma ‐Bond formation$

(C) $3d_{xy}+3d_{xy}\to \pi ‐ Bond formation$        (D) $2s+2p_y\to \pi ‐Bond formation$

(E)$3d_{xy}+3d_{xy}\to \delta Bond formation$             (F)$2p_z+2p_z\to \sigma Bond formation$

(a) A,B,C                      (b) C,F

(c) B,E                         (D) B,C,D

How many sigma bonds are in a molecule of diethyl ether, $C_2{H}_{5}O{C}_2{H}_5$

1. 14         

2. 12         

3. 8         

4. 16

Which of the following species has a zero dipole moment?

$\left(\mathrm{i}\right)$ ${\mathrm{CO}}_2$ (ii) ${\mathrm{COCl}}_2$ (iii) ${\mathrm{CH}}_2$ ${\mathrm{Cl}}_2$ (iv) ${\mathrm{BCl}}_3$

Which of the following is a pair of polar molecules?

1. ${\mathrm{CO}}_2$ $\mathrm{and}$ ${\mathrm{H}}_2\mathrm{O}$

2. ${\mathrm{BF}}_3$ $\mathrm{and}$ ${\mathrm{PCl}}_3$

3. ${\mathrm{SO}}_2$ $\mathrm{and}$ ${\mathrm{SCl}}_2$

4. ${\mathrm{CS}}_2$ $\mathrm{and}$ ${\mathrm{SO}}_3$

The incorrect order of lattice energy among the following set is:

1. ${\mathrm{AlF}}_3>{\mathrm{MgF}}_2$         

2. ${\mathrm{Li}}_3\mathrm{N}>{\mathrm{Li}}_2\mathrm{O}$

3. $\mathrm{NaCl}>\mathrm{LiF}$           

4. $\mathrm{TiC}>\mathrm{ScN}$

Which of the following set of species have planar structures?

(a) ${\mathrm{I}}_3^{-}, {\mathrm{CH}}_3, {\mathrm{CLO}}_3^{-}, {\mathrm{SiF}}_6^{2-}$

(b) ${\mathrm{I}}_3^{+}, {\mathrm{ICl}}_4^{-}, {\mathrm{Al}}_2{\mathrm{Cl}}_6, {\mathrm{TeCl}}_4$

(c) ${\mathrm{SCl}}_2, {\mathrm{N}}_2{\mathrm{O}}_5, {\mathrm{SF}}_4,{\mathrm{XeOF}}_4$

(d) ${\mathrm{I}}_2{\mathrm{Cl}}_6, {\mathrm{XeF}}_2, {\mathrm{BrF}}_4^{-}$