Halides of Group 16

Q.

Define bond length?

Q. $A$ compound $X$, of boron reacts with $N{H}_3$ on heating to give another compound $Y$ which is called inorganic benzene. The compound $X$ can be prepared by treating $B{F}_3$ with Lithium aluminium hydride. The compounds $X$ and $Y$ are represented by the formulas.

1. $B_3{N}_3{H}_6,B_2{H}_6$
2. $B{F}_3,B_3{N}_3{H}_6$
   

3. $B_2{O}_3,B_3{N}_3{H}_6$

4. $B_2{H}_6,B_3{N}_3{H}_6$

Q. $S{F}_6$ is stable (thermally) than/as $Se{F}_6$.

1. less
2. more
3. almost as

Q. Find the incorrect match :- (1) Al2Cl6 : 3C–4e bond is present (2) Al 2(CH3 )6 : Allcarbonatomsaresp3 hybridised (3) I2Cl6 : Non-planar (4) Al2Br6 : Non-planar (actually my qouestion is how can be al2br6 planar as it posses sp3 hybridized orbitals)

Q. $S{F}_4$ is used as fluorinating agent in organic reactions because it dissociates easily.

1. True
2. False

Q. Which of the following statements are correct about $S{F}_4$?

1. It is prepared by treating $SC{l}_2$ with a fluoride like $NaF$ in acetonitrile.
2. Its initial hydrolysis gives $S{O}_2$ and $HF$.
3. It has a square planar shape with the sulphur atom having 2 lone pairs
4. $S$ atom has an expanded octet.

Q. (i) Draw cis and trans isomers of the following compound. Also write their IUPAC names : $CHCl=CHCl$
(ii) Draw cis and trans isomers of the following compound. Also write their IUPAC names : $C_2{H}_{5}CC{H}_3=CC{H}_3{C}_2{H}_5$

Q. The table shown below gives the bond dissociation energies for single covalent bonds of carbon (C) atoms with element and Which element has the smallest atoms

$\begin{array}{cc}\text{Bond}& E_{diss}\left(kJmo{l}^{-1}\right)\\ \text{C - A}& \text{240}\\ \text{C - B}& \text{328}\\ \text{C - C}& \text{276}\\ \text{C - D}& \text{485}\end{array}$

1. A
2. B
3. C
4. D

Q. $S{F}_4$ can act as Lewis acid in the presence of strong Lewis base and as Lewis base in the presence strong Lewis acid.

1. True
2. False

Q.

What is the hybridization and geometry of $S{F}_4$ ?

1. $s{p}^3$ , tetrahedral

2. $s{p}^{3}d$, octahedral

3. $s{p}^{3}d$, seesaw

4. None of these

Q. Predict the compounds given in column I with the shape given in column II and mark the correct option.

Column I	Column II
(a) $Xe{F}_6$	(i) Distorted octahedral
(b) $Xe{O}_3$	(ii) Square planar
(c) $XeO{F}_4$	(iii) Pyramidal
(d) $Xe{F}_4$	(iv) Square pyramidal

1. $\left(a\right)-\left(i\right),\left(b\right)-\left(iii\right),\left(c\right)-\left(iv\right),\left(d\right)-\left(ii\right)$
2. $\left(a\right)-\left(i\right),\left(b\right)-\left(ii\right),\left(c\right)-\left(iv\right),\left(d\right)-\left(iii\right)$
3. $\left(a\right)-\left(iv\right),\left(b\right)-\left(iii\right),\left(c\right)-\left(i\right),\left(d\right)-\left(ii\right)$
4. $\left(a\right)-\left(iv\right),\left(b\right)-\left(i\right),\left(c\right)-\left(ii\right),\left(d\right)-\left(iii\right)$

Q. What is the hybridization and geometry of $S{F}_4$ ?

1. , octahedral
2. , tetrahedral
3. , seesaw
4. None of these

Q. Among the following, the number of halide(s) inert to hydrolysis is
(a) $B{F}_3$
(b) $SiC{l}_4$
(c) $PC{l}_5$
(d) $S{F}_6$

Q.

What is the hybridization and geometry of \(SF_4\) ?

Q. what is the n factor of an element?

Q. Assertion :During covalent bonding the electronegativity difference between two atoms is greater than $1.7$ Reason: Covalent bond is formed by sharing of electrons between atoms that have same size

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Shape , hybridisation and bond order of NO2

Q. Write the formula of the compound of phosphorus which is obtained when $conc.HN{O}_3$ oxidises $P_4$.

Q. For the type of interactions : (I) covalent bond, (II) van der Waals' forces, and (III) hydrogen bonding, which represents the correct order of increasing stability?

1. $\left(I\right)<\left(III\right)<\left(II\right)$
2. $\left(II\right)<\left(III\right)<\left(I\right)$
3. $\left(II\right)<\left(I\right)<\left(III\right)$
4. $\left(III\right)<\left(II\right)<\left(I\right)$

Q. Name the three types of electrolytes. Give an example for each.

Q. Compare bond angles for the following molecules:

1. x > y
2. x = y
3. None of these
4. y > x

Q. The number and type of bonds between two C atoms of $Ca{C}_2$ are

1. One sigma and one pi bonds
2. One sigma and two pi bonds
3. One sigma and one and half pi bonds
4. One sigma bond

Q. What is an electron sea model?

Q. Acid-base reaction involves reaction between:

1. $Mg(OH{)}_2$ and $H_{2}S{O}_4$
2. $MgC{O}_3$ and $H_{2}S{O}_4$
3. $Mg(OH{)}_2$ and $HCl$
4. $MgC{O}_3$ and $HCl$

Q.

predict the shapes of H₂O and CH₄ using VSEPR theory

Q. Bond energy of covalent $O-H$ bond in water is:

1. greater than bond energy of hydrogen bond
2. equal to bond energy of hydrogen bond
3. half of the bond energy of hydrogen bond
4. less than bond energy of hydrogen bond

Q. When sulphur is treated with an excess of Fluorine,
the compound formed is:

1. $S{F}_4$
2. $S_2{F}_2$
3. $S{F}_6$
4. $S_2{F}_6$

Q. In which of the following cases hydrolysis takes place through $S_{N}2and{S}_{N}1$ mechanism, respectively?

1. $NC{l}_3,N{F}_3$
2. $P_4{O}_{10},SiC{l}_4$
3. $SiC{l}_4,Si{F}_4$
4. $S{F}_4,Te{F}_6$

Q. $S{F}_4$ can act as Lewis acid in the presence of strong Lewis base and as Lewis base in the presence strong Lewis acid.

1. True
2. False

Q. $S{F}_6$ is stable (thermally) than/as $Se{F}_6$.

1. less
2. more
3. almost as