Overlaps Taking All Together

Q. Which of the following molecules has large extent of back bonding?

1. $O(Si{H}_3{)}_2$
2. $O{I}_2$
3. $NC{l}_3$
4. All have same extent

Q.

The correct statement regarding F - centre is

1. Electron are held in the voids of crystal

2. F- centre produces colour to the crystal

3. Conductivity of the crystal increases dus to F-centre

4. All

Q. The donation of lone pair of electrons of $CO$ carbon into the vacant orbital of metal atom results in _______.

1. back bond
2. $\sigma$- bond
3. $\pi$-bond
4. synergic bond

Q. According to VBT, the direction of a bond which is formed due to overlapping will be_________

1. In the same direction in which orbitals are concentrated
2. In the opposite direction in which orbitals are concentrated
3. Perpendicular to the direction in which orbitals are concentrated
4. None of the mentioned

Q. Match the orbital overlap figures shown in column I with the description given in column II and select the correct answer using the codes given below

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

Q. Which of the following molecule have only one $p\pi -d\pi$ bond and zero $p\pi -p\pi$ bonds?

1. $Cl{O}_3^{-}$
2. $S{O}_2$
3. $Cl{F}_3$
4. $S{O}_3^{2-}$

Q. $p\pi -d\pi$ back bonding cannot occur in:

1. $O(Si{H}_3{)}_2$
2. $P{F}_3$
3. $As{F}_3$
4. $B{F}_3$

Q. Which of the following orbital overlap is not possible according to VBT?

1. 
2. 
3. 
4. All of the above

Q. $p\pi -d\pi$ back bonding cannot occur in:

1. $O(Si{H}_3{)}_2$
2. $P{F}_3$
3. $As{F}_3$
4. $B{F}_3$

Q.

Which of the following compounds does not have molecular plane as nodal plane for its $\pi$ - electron cloud?

1. $C{H}_2$ = $C{H}_2$

2. $C_6{H}_6$

3. $C{H}_2$ = C = $C{H}_2$

4. All of the above

Q. Statement 1: $N{Me}_3$ and $N{\left(Si{Me}_3\right)}_3$ are not isostructural.
Statement 2: $N{Me}_3$ and $N{\left(Si{Me}_3\right)}_3$ have the same steric number.

Regarding the above statements which of the following is/are correct?

1. Both the statements are true
2. Both the statements are false
3. Only statement 1 is true
4. Only statement 2 is true

Q. An $S_{N}2$ reaction at an asymmetric carbon of a compound always gives:

1. A mixture of diastereomers
2. A single stereoisomer
3. A product with opposite optical rotation
4. An enantiomer of the substrate