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

Both $\mathrm{N}{\left({\mathrm{SiH}}_3\right)}_3$ and $\mathrm{NH}{\left({\mathrm{SiH}}_3\right)}_2$compounds have trigonal planer skeleton. Incorrect statement about both compound is :

(1) SiNSi bond angle in $\mathrm{NH}{\left({\mathrm{SiH}}_3\right)}_2$ $>$ SiNSi bond angle in $N{\left({\mathrm{SiH}}_3\right)}_3$

(2) $\mathrm{N}-\mathrm{Si}$ bond length in $\mathrm{NH}{\left({\mathrm{SiH}}_3\right)}_2>\mathrm{N}-\mathrm{Si}$ bond length in $\mathrm{N}{\left({\mathrm{SiH}}_3\right)}_3$

(3) $N-Si$ bond length in $\mathrm{NH}{\left({\mathrm{SiH}}_3\right)}_2<N-Si$ bond length in $\mathrm{N}{\left({\mathrm{SiH}}_3\right)}_3$

(4) Back bonding strength in $\mathrm{NH}{\left({\mathrm{SiH}}_3\right)}_2>$ Back bonding strength in $N{\left({\mathrm{SiH}}_3\right)}_3$

The incorrect statement regarding $\mathrm{O}{\left({\mathrm{SiH}}_3\right)}_2$ and ${\mathrm{OCl}}_2$ molecule is/are:

(1) The strength of back bonding is more in $\mathrm{O}{\left({\mathrm{SiH}}_3\right)}_2$ molecule than ${\mathrm{OCl}}_2$ molecule

(2) $\mathrm{Si}—\mathrm{O}—\mathrm{Si}$ bond angle in $\mathrm{O}{\left({\mathrm{SiH}}_3\right)}_2$ is greater than $\mathrm{Cl}—\mathrm{O}—\mathrm{Cl}$ bond angle in ${\mathrm{OCl}}_2$

(3) The nature of back bond in both molecules is $2{\mathrm{p}}_{\sigma }‐3{\mathrm{d}}_{\mathrm{\pi }}$

(4) Hybridisation of central $\mathrm{O}‐\mathrm{atom}$ in both molecules is same

Which of the following compound have the same no. of lone pair with their central atom?

(i)${\mathrm{XeF}}_5^{- }$             

(ii) ${\mathrm{BrF}}_3$                 

(iii) ${\mathrm{XeF}}_2$                     

(iv) ${\mathrm{H}}_3{\mathrm{S}}^{+}$               

(v) Triple Methylene     

options are as follows :        

(1) (iv) and (v)                                     

(2) (i) and (iii) 

(3) (i) and (ii)                                     

(4) (ii) (iv), (v)

The "O$-$N$-$O" bond angle is maximum in:

$\left(a\right) N_{2}O \left(b\right)N{O_2}^{+}$
$\left(C\right)N{O_2}^{-} \left(d\right) N{O_3}^{-}$

Among following molecule $\mathrm{N}—\mathrm{Si}$ bond length is shortest:

(1) $\mathrm{N}({\mathrm{SiH}}_3{)}_3$                           

(2) $\mathrm{N}({\mathrm{SiH}}_3{)}_2$

(3) ${\mathrm{NH}}_2\left({\mathrm{SiH}}_3\right)$                         

(4) All have equal $\mathrm{N}—\mathrm{Si}$ bond length