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

Among the following aluminium compounds ---------------- acts as a catalyst to break certain kinds of C-O and N-O bonds.

  1. aluminium dodecaboride

  2. aluminium fluoride

  3. aluminium iodide

  4. Aluminium hydride
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Aluminium iodide is any chemical compound containing only aluminium and iodine. Aluminium iodide is employed as a catalyst to break certain kinds of C-O and N-O bonds. It cleaves aryl ethers and deoxygenates epoxides.

Multiple choice

Compound used in deep ultraviolet optoelectronics is

  1. aluminium isopropoxide

  2. aluminium magnesium boride

  3. aluminium nitrate

  4. aluminium nitride
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Aluminium nitride (AlN) is a nitride of aluminium. Its wurtzite phase (w-AlN) is a wide band gap (6.2 eV) semiconductor material, giving it potential application for deep ultraviolet optoelectronics.

Multiple choice

A Lewis acid is an electron pair acceptor. Among the following, --------------------- is a lewis acid.

  1. trimethylgallium

  2. trimethylindium

  3. trimethylaluminium

  4. aluminium chloride
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Aluminium chloride is the main compound of aluminium and chlorine. It is white, but samples are often contaminated with iron trichloride. It is mainly produced and consumed in the production of aluminium metal. The compound is a Lewis acid.

Multiple choice

Which of the following compounds acts as a co-catalyst for the polymerization of alkenes?

  1. Triethylaluminium

  2. Diisobutylaluminium hydride

  3. Ethylaluminium sesquichloride

  4. Triisobutylaluminium
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Diisobutylaluminium hydride is a reducing agent .It is useful in organic synthesis for a variety of reductions and converting esters and nitriles to aldehydes. It efficiently reduces α-β unsaturated esters to the corresponding allylic alcohol. It acts as a co-catalyst for the polymerization of alkenes.

Multiple choice

Lithium batteries are disposable batteries having lithium as an anode. Which of the following compounds can be used as a high permittivity component of electrolytes in lithium batteries?

  1. Dimethyl carbonate

  2. Ethylene carbonate

  3. Propylene carbonate

  4. Polypropylene carbonate
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ethylene carbonate is an ester of ethylene glycol and carbonic acid. Ethylene carbonate is used as a polar solvent.  It can be used as a high permittivity component of electrolytes in lithium batteries.

Multiple choice

Which among the following is a dimer of cyanamide?

  1. Cyanogen chloride

  2. 2-Cyanoguanidine

  3. Cyanuric acid

  4. Cyanuric chloride
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

2-Cyanoguanidine is a nitrile derived from guanidine. It is a dimer of cyanamide, from which it can be prepared. 2-Cyanoguanidine is a colourless solid that is soluble in water, acetone, and alcohol, but not in diethyl ether or chloroform.

Multiple choice

Which species has maximum number of lone pair of electrons?

  1. PO3-

  2. ClO3-

  3. SO4--

  4. I3-

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

I3- ion has three lone pair of electron because I- atom containing eight electrons instead of seven, two electron are shared with two I-atom and remaining three lone pairs are left.

Multiple choice

Which of the following is speier salt?

  1. H2PtCl6

  2. RhCl(PPh3)3

  3. Al(C2H5)3

  4. Co2(CO)8

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

This option is correct,   the speier catalyst is generated from chloroplatinic acid. It is used in hydrosilyation,  i.e.,  called catalytic hydrosilylation.

Multiple choice

Which of the following is shift reagent?

  1. (NH4)2S2O8

  2. KMnO4

  3. [Ce(NO3)4.2NH4NO3]

  4. [Eu(dmp)3]

  5. [Rh(PPh3)3Cl]
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This option is correct,  because the shift reagent [tris-(dipivalomethanato)europium] are ion in a rare earth coordinate to organic ligand such as beta-ketone of Eu+3. These are synthesized more recent shift reagent.