Chemical Bonding and Molecular Structure · Question 85

Which of the following is not a correct statement?

1. Multiple bonds are always shorter than corresponding single bonds.
2. The electron-deficient molecules can act as Lewis acids.
3. The canonical structures have no real existence.
4. Every AB5 molecule does in fact have square pyramid structure.

Which of the following is not isostructural with SiCl4 ?

1. NH4+
2. SCl4
3. SO42-
4. PO43-

Which of the following species has a linear shape?

1. O3
2. NO2-
3. SO2
4. NO2+

The electronegativity difference between N and F is greater than that between N and H yet the dipole moment of NH3 (1.5 D) is larger than that of NF3 (0.2 D). This is because

1. in NH3 the atomic dipole and bond dipole are in the opposite directions whereas in NF3 these are in the same direction
2. in NH3 as well as in NF3 the atomic dipole and bond dipole are in the same direction
3. in NH3 the atomic dipole and bond dipole are in the same direction whereas in NF3 these are in opposite directions
4. in NH3 as well as in NF3 the atomic dipole and bond dipole are in opposite directions.

In which of the following molecules are all the bonds not equal?

1. NF3
2. ClF3
3. BF3
4. AlF3

Which of the following molecules has trigonal planar geometry?

1. BF3
2. NH3
3. PCl3
4. IF3

The correct order in which the O-O bond length increases in the following is

1. O2 < H2O2 < O3
2. O3 < H2O2 < O2
3. H2O2 < O2 < O3
4. O2 < O3 < H2O2

The correct sequence of increasing covalent character is represented by

1. LiCl < NaCl < BeCl2
2. BeCl2 < LiCl < NaCl
3. NaCl < LiCl < BeCl2
4. BeCl2 < NaCl < LiCl

Which of the following would have a permanent dipole moment?

1. SiF4
2. SF4
3. XeF4
4. BF3

Among the following, the pair in which the two species are not isostructural is

1. SiF4 and SF4
2. IO3- and XeO3
3. BH4- and NH4+
4. PF6- and SF6