Chemistry

Organic Chemistry Fundamentals

237 Questions

Organic chemistry fundamentals cover the structure, properties, and reactions of carbon containing compounds. The questions explore functional groups, isomerism, homologous series, and basic reaction mechanisms. This forms the basis of general chemistry across multiple examination formats.

Functional groupsIsomerism typesHomologous seriesCycloalkanesOrganic monomers

Organic Chemistry Fundamentals Questions

Multiple choice

The pair of compounds representing isomers is

  1. methane and ethane.

  2. propane and butane.

  3. butene-1 and butene-2.

  4. propene and butene.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Isomers are compounds with the same molecular formula but different structural arrangements. Butene-1 and butene-2 are structural isomers due to the position of the double bond.

Multiple choice

An example of cyclic carbon compound is

  1. cyclobutane.

  2. cyclopropane.

  3. cyclopentane.

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cyclobutane, cyclopropane, and cyclopentane are all examples of cyclic carbon compounds (cycloalkanes).

Multiple choice

n-Pentane and iso pentane represent

  1. homologues.

  2. structural isomers.

  3. same compound.

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

n-Pentane and isopentane have the same molecular formula (C5H12) but different structural arrangements of their carbon chains. Therefore, they are structural isomers.

Multiple choice

If the ligands are present at the same side then, the isomer is called as

  1. ionization isomers

  2. optical isomers

  3. trans isomers

  4. cis isomers
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When two identical groups (ligands) occupy adjacent positions, the isomer is called cis. It is not possible for co-ordination number of 2 and 3 and for tetrahedral complexes of co-ordination number 4. It is common in square planar and octahedral complexes. 

Multiple choice

Ring forming ligands are called as

  1. π- acid ligands

  2. ambidentate ligands

  3. bidentate ligands

  4. chelating ligand
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When polydentate ligands bind to the central metal ion, they form a ring called chelate and the ligand is referred as chelating ligand.

Multiple choice

d & l are the isomers found in

  1. hydrate isomerism

  2. optical isomerism

  3. coordination isomerism

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

Optical isomers rotate the plane of polarised light in opposite directions. They are called dextro and laevo (d and l) rotatory depending upon the direction in which plane polarised light is rotated .

Multiple choice

Which of the following metallacycles has the formula LnM(CH)4?

  1. Metallacyclobutanes

  2. Metallacyclopentadienes

  3. Metallacyclopentanes

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

The parent metallacyclopentadiene has the formula LnM(CH)4. Most arise from the coupling of two alkynes at a low valent metal centres such as derivatives of Co(I) and Zr(II). Late metal derivatives (Co, Ni) are intermediates in the metal-catalysed trimerization of alkynes to arenes. For example, the zirconacyclopentadiene Cp2ZrC4Me4 is a useful carrier for C4Me4 2- .