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

Which of the following statements is/are true? A. 1-chloro-2, 3-pentadiene has no chiral carbon atoms, yet it is a chiral molecule. B. A newly discovered compound is thought to be chiral, but shows no rotation in a specific solvent. Hence, the compound is assuredly achiral. C. When a chiral molecule reacts to give a chiral molecule, the product is always racemic.

  1. Only A

  2. Only B

  3. Only C

  4. Both A and C

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

This statement is true.

Multiple choice

Linkage isomerism will be shown by which of the following?

i. SO32- ii. NO2- iii. SCN−

  1. Only 1

  2. Only 2

  3. Only 1 and 3

  4. Only 2 and 3

  5. All of the above
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

All the three given ligands will show linkage isomerism. The sulphito group (SO32-), an ambidentate ligand, can be coordinated to metal ions through either the oxygen or the sulphur. So, it will show linkage isomerism. NO2- is an ambidentate ligand. It can attach at either the nitrogen atom or the oxygen atom. Hence, it will show linkage isomerism. SCN− is an ambidentate ligand. Since it can attach at either the sulphur atom or the nitrogen atom, it will show linkage isomerism.

Multiple choice

Match the Group - I with Group - II.

 
Group - I (molecules/ions) Group - II (corresponding geometry)
A. BH2+ 1. V-shaped
B. SnBr2 2. linear
C. XeF3+ 3. square pyramidal
D. IF5 4. T-shaped

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

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

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

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

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

BH2+ has sp hybridisation and zero number of lone pair of electrons with linear shape. SnBr2 has sp2 hybridisation and one lone pair of electrons with V-shaped geometry. XeF3+ has sp3d hybridisation and two lone pair of electrons with T-shaped geometry. IF5 has sp3d2 hybridisation and one lone pair of electrons with square pyramidal geometry. Hence, the representation of codes A - 2, B - 1, C - 4, D - 3 is correct.

Multiple choice

Which of the following statements is/are true? A. 1-chloro-2, 3-pentadiene has no chiral carbon atoms, yet it is a chiral molecule. B. A newly discovered compound is thought to be chiral but shows no rotation in a specific solvent. C. When a chiral molecule reacts to give a chiral molecule the product is always racemic.

  1. Only A

  2. Only B

  3. Only C

  4. Only A and C

  5. Only B and C
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This statement is true because the molecule as whole is chiral, since this molecule and its mirror image are non-superimposable.

Multiple choice

What is valency of carbon?

  1. 8

  2. 6

  3. 4

  4. 3
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Carbon has 4 valence electrons in its outer shell, allowing it to form four covalent bonds. This valency of 4 is fundamental to organic chemistry.

Multiple choice

Alkenes and alkynes are _________.

  1. saturated aliphatic hydrocarbons

  2. unsaturated aliphatic hydrocarbons

  3. unsaturated aromatic hydrocarbons

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

Unsaturated aliphatic hydrocarbons are those hydrocarbons in which cabon - carbon double bond and triple bonds are present . 

Multiple choice

Which of the following statements is/are correct?

A. Isomers are same compounds with different molecular formula. R. Isomers have different arrangement of their constituent atoms in the space.

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

Isomers are different compounds with same molecular formula. Isomers have different arrangement of their constituent atoms in the space.