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Chemical Bonding and Molecular Structure · Question 86

AIPMT 2006MCQEasy📈 Topic in 75% papers+4−1
1

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.

Answer

(4) Every AB5 molecule does in fact have square pyramid structure.

Solution

(1) A multiple bond has a higher bond order than the corresponding single bond, so it is shorter ⇒ correct.

(2) Electron-deficient molecules such as BF3 accept an electron pair, so they act as Lewis acids ⇒ correct.

(3) As per NCERT, the canonical forms have no real existence; the molecule exists only as the resonance hybrid ⇒ correct.

(4) An AB5 molecule with five bond pairs and no lone pair (e.g. PCl5) is trigonal bipyramidal; square pyramidal shape is shown only by AB5E type molecules (e.g. BrF5) ⇒ not correct.

Answer: (4)

AIPMT 2006

Keep practising — Chemical Bonding and Molecular Structure

2

Which of the following is not isostructural with SiCl4 ?

  1. NH4+
  2. SCl4
  3. SO42-
  4. PO43-
AIPMT 2006
3

Which of the following species has a linear shape?

  1. O3
  2. NO2-
  3. SO2
  4. NO2+
AIPMT 2006
4

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.
AIPMT 2006
5

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

  1. NF3
  2. ClF3
  3. BF3
  4. AlF3
AIPMT 2006
6

Which of the following molecules has trigonal planar geometry?

  1. BF3
  2. NH3
  3. PCl3
  4. IF3
AIPMT 2005
7

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
AIPMT 2005
8

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
AIPMT 2005
9

Which of the following would have a permanent dipole moment?

  1. SiF4
  2. SF4
  3. XeF4
  4. BF3
AIPMT 2005
10

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
AIPMT 2004
11

In a regular octahedral molecule, MX6, the number of X - M - X bonds at 180 is

  1. three
  2. two
  3. six
  4. four
AIPMT 2004

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