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Chemical Bonding and Molecular Structure · Question 90

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

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

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

Answer

(2) ClF3

Solution

NF3: 3 bp + 1 lp ⇒ trigonal pyramidal; all three N–F bonds are equivalent.

BF3, AlF3: 3 bp ⇒ trigonal planar; all bonds equal.

ClF3: 3 bp + 2 lp on Cl (sp3d) ⇒ the two lone pairs occupy equatorial positions ∴ T-shaped molecule.

∴ It has one equatorial and two axial Cl–F bonds; the axial bonds are longer than the equatorial bond, so all the bonds are not equal.

Answer: (2)

AIPMT 2006

Keep practising — Chemical Bonding and Molecular Structure

2

Which of the following molecules has trigonal planar geometry?

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

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
4

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
5

Which of the following would have a permanent dipole moment?

  1. SiF4
  2. SF4
  3. XeF4
  4. BF3
AIPMT 2005
6

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
7

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
8

H2O is dipolar, whereas BeF2 is not. It is because

  1. the electronegativity of F is greater than that of O
  2. H2O involves hydrogen bonding whereas BeF2 is a discrete molecule
  3. H2O is linear and BeF2 is angular
  4. H2O is angular and BeF2 is linear.
AIPMT 2004
9

In BrF3 molecule, the lone pairs occupy equatorial positions to minimize

  1. lone pair - bond pair repulsion only
  2. bond pair - bond pair repulsion only
  3. lone pair - lone pair repulsion and lone pair - bond pair repulsion
  4. lone pair - lone pair repulsion only.
AIPMT 2004
10

Which one of the following statements is not correct for sigma- and pi- bonds formed between two carbon atoms?

  1. sigma-bond is stronger than a pi-bond.
  2. Bond energies of sigma- and pi-bonds are of the order of 264 kJ/mol and 347 kJ/mol, respectively
  3. Free rotation of atoms about a sigma-bond is allowed but not in case of a pi-bond.
  4. Sigma-bond determines the direction between carbon atoms but a pi-bond has no primary effect in this regard.
AIPMT 2003
11

Which of the following has p - d bonding?

  1. NO3-
  2. SO32-
  3. BO33-
  4. CO32-
AIPMT 2002

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