Repulsions

Q. In which of the following the repulsion is least?

1. 

2. 

3. 

4. All of these have same repulsion

Q. Which of the following repulsions is highest? (if considered at same angle)

1. 6 lp - bp
2. 1 lp - lp, 5 lp - bp
3. 6 bp - bp
4. 1 lp - lp, 5 bp - bp

Q. The correct order of decreasing $X-O-X$ bond angle is:

1. $C{l}_{2}O>H_{2}O>F_{2}O$
2. $F_{2}O>C{l}_{2}O>H_{2}O$
3. $F_{2}O>H_{2}O>C{l}_{2}O$
4. $C{l}_{2}O>F_{2}O>H_{2}O$

Q. Number of lone pair-bond pair repulsion at ${90}^{\circ }$ are (P) in $I_3^{-}$

Q. The correct order of decreasing $X-O-X$ bond angle is:

1. $C{l}_{2}O>F_{2}O>H_{2}O$
2. $C{l}_{2}O>H_{2}O>F_{2}O$
3. $F_{2}O>H_{2}O>C{l}_{2}O$
4. $F_{2}O>C{l}_{2}O>H_{2}O$

Q. Only iodine forms heptafluoride $I{F}_7$, but chlorine and bromine give pentafluorides. The reason for this is :

1. that the larger iodine atom can accommodate more number of smaller fluorine atom around it
2. low electron affinity of iodine
3. low chemical reactivity of $I{F}_7$
4. unusual pentagonal bipyramidal

Q. Which among the following substances possess only vanderwaal's forces of attraction?

1. Argon
2. Carbon disulphide
3. Hydrogen fluoride
4. Lead

Q. The correct order of bond angles is :

1. $H_{2}S<N{H}_3<B{F}_3<Si{H}_4$
2. $N{H}_3<H_{2}S<Si{H}_4<B{F}_3$
3. $H_{2}S<Si{H}_4<N{H}_3<B{F}_3$
4. $H_{2}S<N{H}_3<Si{H}_4<B{F}_3$

Q. Steric number of the central atom in $I{F}_4^{-}$ is 6.
If true enter 1, else enter 0.

Q. Draw the complete structure of bromomethane, bromoethane, 2-bro, opropane, and tert-buty-butylbrominde. Arrange them in the order of increasing steric hindrance.