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Chemical Bonding and Molecular Structure · Question 22

NEET (UG) 2021MCQEasy📈 Topic in 12% papers+4−1
1

BF3 is planar and electron deficient compound. Hybridization and number of electrons around the central atom, respectively are :

  1. sp2 and 8
  2. sp3 and 4
  3. sp3 and 6
  4. sp2 and 6

Answer

(4) sp2 and 6

Solution

B (Z = 5): 1s2 2s2 2p1; in the excited state 2s1 2px1 2py1.

⇒ One 2s and two 2p orbitals hybridise → three sp2 orbitals, which form three B–F bonds (trigonal planar).

⇒ Electrons around B = 3 bond pairs = 6 electrons (incomplete octet, so BF3 is electron deficient).

∴ sp2 and 6

Answer: (4)

NEET (UG) 2021

Keep practising — Chemical Bonding and Molecular Structure

2

Match List - I with List - II : Choose the correct answer from the options given below.

  1. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
  2. (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
  3. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
  4. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
NEET (UG) 2021
3

Which of the following molecules is non-polar in nature?

  1. NO2
  2. POCl3
  3. CH2O
  4. SbCl5
NEET (UG) 2021
4

Which of the following set of molecules will have zero dipole moment?

  1. Boron trifluoride, hydrogen fluoride, carbon dioxide, 1, 3-dichlorobenzene
  2. Nitrogen trifluoride, beryllium difluoride, water, 1, 3-dichlorobenzene
  3. Boron trifluoride, beryllium difluoride, carbon dioxide, 1, 4-dichlorobenzene
  4. Ammonia, beryllium difluoride, water, 1, 4-dichlorobenzene
NEET (UG) 2020
5

Identify a molecule which does not exist.

  1. Li2
  2. C2
  3. O2
  4. He2
NEET (UG) 2020
6

Which of the following diatomic molecular species has only bonds according to Molecular Orbital Theory?

  1. C2
  2. Be2
  3. O2
  4. N2
NEET (UG) 2019
7

Consider the following species : CN+, CN-, NO and CN. Which one of these will have the highest bond order?

  1. NO
  2. CN-
  3. CN+
  4. CN
NEET 2018
8

In the structure of ClF3, the number of lone pairs of electrons on central atom ‘Cl’ is

  1. one
  2. two
  3. four
  4. three
NEET 2018
9

Which of the following pairs of compounds is isoelectronic and isostructural ?

  1. TeI2, XeF2
  2. IBr2-, XeF2
  3. IF3, XeF2
  4. BeCl2, XeF2
NEET 2017
10

The species, having bond angles of 120 is

  1. ClF3
  2. NCl3
  3. BCl3
  4. PH3
NEET 2017
11

Which one of the following pairs of species have the same bond order ?

  1. O2, NO+
  2. CN-, CO
  3. N2, O2-
  4. CO, NO
NEET 2017

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