Chemistry

Chemical Bonding and Molecular Structure

1,420 Questions

This section tests your knowledge of chemical bonding, molecular structure, and hybridization. It covers ionic and covalent bonds, octet rule exceptions, and molecular geometry. These chemistry questions are common in various competitive entrance examinations.

Ionic and covalent bondsHybridisation of elementsOctet rule exceptionsMolecular geometryIntermolecular forces

Chemical Bonding and Molecular Structure Questions

Multiple choice

Assertion: Six p-orbitals in benzene combine to form three bonding and three antibonding molecular orbitals. Reason: Each bonding orbital contains a pair of electrons with opposite spins.

  1. Both A and R are true and R is the correct explanation of A.

  2. Both A and R are true but R is NOT the correct explanation of A.

  3. A is true but R is false.

  4. A is false but R is true.

  5. Both A and R are false.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

According to the principle of LCAO, number of MO’s is equal to the number of combining AO’s; half of which are bonding and the rest of the half are antibonding. Thus, this option is correct.

Multiple choice

Carbon atoms of 1, 3-butadiene are numbered as shown below CH2=CH−CH=CH2 Which of the following statements regarding the above compound is incorrect? A. Carbon atoms 1 and 4 are sp2-hybridized. B. The single bond between C2 and C3 is of the same length as the carbon-carbon bond length in ethane. C. It is a conjugated diene.

  1. Only A

  2. Only B

  3. Only C

  4. Only B and C

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Due to resonance, C2-C3 bond has some double bond character,  and hence its bond length (1.46 Ǻ) is shorter than the C-C bond length in ethane (1.54 Ǻ).

Multiple choice

Which of the following compounds is also known as 'Paris green?'

  1. Cu(C2H3O2)2.3Cu(AsO2)2

  2. As2S3

  3. As4S4

  4. As2O3

  5. CuHAsO3
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This option is correct because when the copper acetate and arsenic oxide react, copper(II) acetatoarsenite is formed. It is used as agricultural insecticides and is known as Paris green.

Multiple choice

Match the column – I (molecules) with column – II (bond angles) and select the correct answer ||| |---|---| |Molecules |Bond angles| |A. XeOF5−|1. 90°, 72° and 180°| |B. BrF5|2. 90° and 180°| |C. SF4|3. 72°, 90° and 144° | |D. IF7|4. 173.1° and 101.6°|

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

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

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

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

  5. A - 1, B - 2, C - 3, D - 4
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This option is correct because all the angles are correctly matched with their molecules. XeOF5− - 72°, 90° and 144° BrF5 - 90° and 180° SF4 - 173.1° and 101.6° IF7 - 90°, 72° and 180°

Multiple choice

Which of the following lithium compounds acts as an electrolyte of lithium batteries?

  1. Lithium tetrachloroaluminate

  2. Lithium tetrakis(pentafluorophenyl)borate

  3. Lithium tetramethylpiperidide

  4. Lithium triethylborohydride
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Lithium tetrachloroaluminate is an inorganic compound, a tetrachloroaluminate of lithium, with the formula LiAlCl4. Solution of lithium tetrachloroaluminate in thionyl chloride is the liquid cathode and electrolyte of some lithium batteries, e.g. lithium-thionyl chloride cell.

Multiple choice

Infrared spectroscopy deals with the study of the interaction between infrared light & the matter. Which among the following is used in windows for infrared spectroscopy?

  1. Barium iodide

  2. Barium hydroxide

  3. Barium fluoride

  4. Barium oxide
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Barium fluoride (BaF2) is a chemical compound of barium and fluorine. It is transparent from the ultraviolet to the infrared, from 150-200 nm to 11-11.5 µm, and can be used as a material to make optical components such as lenses. It is used in windows for infrared spectroscopy, in particular in the field of fuel oil analysis.