WBJEE 2025 Organic Chemistry Practice Questions with Solutions

Prateek Lakhera

Updated On: January 27, 2025 10:01 AM | WBJEE

Attempting WBJEE 2025 Organic Chemistry practice questions with solutions can boost your confidence and prepare you for the important, high-scoring topics. The Organic Chemistry chapter carries approximately 6% weightage and hence, is a good way to fetch high marks in WBJEE Paper II. 
WBJEE 2025 Organic Chemistry Practice Questions with Solutions

WBJEE 2025 Organic Chemistry Practice Questions: Organic Chemistry is one of the most important chapters in the WBJEE Chemistry syllabus 2025. Often the section features some of the most challenging questions in the from topics such as Carbon, Bonding, Alkanes, and Haloalkanes. It carries a weightage of approximately 6% and a good 4-5 questions are asked every year from this chapter. To be able to attempt the maximum number of questions and score high marks in the examination, you should diligently solve WBJEE 2025 Organic Chemistry practice questions from these topics. WBJEE Organic Chemistry sample questions are meant to provide you with a series of probable questions that may be asked in the upcoming WBJEE 2025 exam . Our experts have prepared a set of model questions on the basis of the previous years' question papers and topic weightage. You can find the WBJEE 2025 Organic Chemistry practice questions with solutions on this page.

Also Check - WBJEE 2025 Vector Algebra Practice Questions with Solutions

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List of WBJEE 2025 Organic Chemistry Sub Topics for Exam Preparations

The WBJEE 2025 Chemistry syllabus PDF highlighting the key topics from the Organic Chemistry section is available on the official WBJEE website. The sub-topics contain detailed description, theories and formulae from the Organic Chemistry chapter. It is important to prepare all the sub-topics from Organic Chemistry in order to have a dedicated study plan. Check out the list of Organic Chemistry topics for WBJEE 2025.

Chapter

Sub Topics

Organic Chemistry

Carbon

Oxygen and Sulphur

Halogens

Polymers

Hybridization of carbon

Conformations of ethane and n-butane

Alkanes

Alkenes and Alkynes

Oxymercuration-demarcation

Haloalkanes and Haloarenes

Alcohols

Ethers

Amines

Also Check - WBJEE 2025 Trigonometry Practice Questions with Solutions

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WBJEE 2025 Organic Chemistry Expected Weightage

The expected marks weightage for WBJEE Organic Chemistry gives you an idea about how many marks the chapter will cover and how many questions may be asked from this section. The Organic Chemistry section includes 4-5 questions and has a weightage of around 6% making it an important part of the WBJEE 2025 syllabus PDF . Let’s have a look at the WBJEE 2025 Organic Chemistry expected marks weightage from the table below.

Topic

Expected Number of Questions

Expected Weightage

Organic Chemistry

4-5

6%

WBJEE 2025 Organic Chemistry Practice Questions with Solutions

Good exam preparation includes solving WBJEE 2025 Organic Chemistry practice questions. This practice not only helps in building clarity on the Chemistry fundamentals but also gives enough material to practice for the examination. The following are some of the most important WBJEE 2025 Organic Chemistry practice questions with solutions.

Q1. In the IUPAC system, PhCH 2 CH 2 CO 2 H is named as:

a. 3-phenylpropanoic acid

b. Benzylacetic acid

c. Carboxyethylbenzene

d. 2-Phenylpropanioc acid

Ans. a. 3-phenylpropanoic acid

Q2. The correct acidity order of phenol (I), 4-hydroxybenzaldehyde (II) and 3-hydroxybenzaldehyde (III) is:

a. I < II < III

b. I < III <II

c. II < III < I

d. III < II < I

Ans. b. I < III <II

Solution:

To determine the correct acidity order of phenol (I), 4-hydroxybenzaldehyde (II), and 3-hydroxybenzaldehyde (III), we need to consider the electron-withdrawing or electron-donating effects of the substituents on the phenol ring and how these affect the stability of the phenoxide ion after deprotonation.

The presence of the electron-withdrawing aldehyde group influences the acidity of the phenol by stabilizing the negative charge on the oxygen atom of the phenoxide ion. This stabilization is more significant when the aldehyde group is closer (para position) or less steric hindered compared to the hydroxyl group.

1. Phenol (I): Has no additional electron-withdrawing groups to stabilize the phenoxide ion, thus has the least acidity.

4-Hydroxybenzaldehyde (II): The CHO group at the para position significantly withdraws electron density through both inductive and resonance effects, stabilizing the phenoxide ion more effectively than at the meta position.

3-Hydroxybenzaldehyde (III): The CHO group at the meta position primarily withdraws electron density through inductive effects, which is less stabilizing than the para position incorporation.

Therefore, the correct acidity order is:

Phenol (I) < 3-Hydroxybenzaldehyde (III) < 4-Hydroxybenzaldehyde (II)

Or, I < III < II

Q3. Select the molecule in which all the atoms may lie on a single plane is:

a. 4-Nitrobenzaldehyde

b. 4-Methoxybenzaldehyde

c. 4-Methylnitrobenzene

d. 4-Nitroacetophenone

Ans. a. 4-Nitrobenzaldehyde

Q4. The maximum number of atoms that can be in one plane in the molecule p-nitrobenzonitrile are:

a. 6

b. 12

c. 13

d. 15

Ans. d. 15

Q5. Which structure has delocalized ⲡ-electrons?

a. O3

b. CO

c. HCN

d.O3 and HCN

Ans. a. O 3

Q6. Among Me 3 N, C 5 H 5 N, and MeCN (Me = methyl group) the electronegativity of N is in the order:

a. MeCN > C5H5N > Me3N

b. C5H5N > Me3N > MeCN

c. MeN > MeCN > C5H5N

d. Electronegativity same in all

Ans. a. MeCN > C 5 H 5 N > Me 3 N

Q7. The correct order of acid strengths of benzoic acid (X), peroxybenzoic acid (Y), and p-nitrobenzoic acid (Z) is:

a. Y > Z > X

b. Z > Y > X

c. Z > X > Y

d. Y > X > Z

Ans. c. Z > X > Y

Q8. How many monobriminated product(s) (including stereoisomers) would form in the free radical bromination of n-butane?

a. 2

b. 1

c. 3

d. 4

Ans. c. 3

Q9. Which of the following statements about the SN 2 reaction mechanism is/are true?

a. The rate of reaction increases with increasing nucleophilicity

b. The number 2 denotes a second order reaction

c. Tertiary butyl substrates do not follow this mechanism

d. The optical rotation of substrates always changes from (+) to (-) or from (-) to (+) in the product

Ans. Options a., b., and c.

Solution:

The correct statements about the SN 2 reaction mechanism are:

Option A: The rate of reaction increases with increasing nucleophilicity.

This statement is true. In an SN 2 reaction, the nucleophile attacks the electrophilic carbon in a single, concerted step. Therefore, a stronger (more nucleophilic) nucleophile will generally result in a faster reaction because it can more readily attack the carbon center.

Option B: The number 2 denotes a second-order reaction.

This statement is also true. The term SN 2 stands for bimolecular nucleophilic substitution and indicates that the rate-determining step involves two reacting species: the nucleophile and the electrophilic substrate. The rate law for an SN 2 reaction is given by:

Rate = k[Nucleophile][Electrophile]

This indicates that the reaction is second-order overall.

Option C: Tertiary butyl substrates do not follow this mechanism.

This statement is true. Tertiary butyl substrates are typically very sterically hindered, making it difficult for the nucleophile to approach the electrophilic carbon from the backside, which is required for the SN 2 mechanism. As a result, tertiary substrates usually do not undergo SN2 reactions.

Option D: The optical rotation of substrates always changes from (+) to (-) or from (-) to (+) in the products.

This statement is incorrect because in an SN 2 reaction inversion does take place but we can never say a dextro substrate will produce a levo product or vice-versa. Because the dextro or levo nature of the reactant or product is purely experimental.

Q10. Cyclopentanol on reaction with NaH followed by CS 2 and CH 3 I produces a/an:

a. ketone

b. alkene

c. ether

d. Xanthate

Ans. d. Xanthate

Quick Links: Apart from using WBJEE 2025 Organic Chemistry practice questions with solutions, regularly attempt WBJEE 2025 mock test series from these chapters to further bolster your exam preparation, rectify mistakes and shortcomings and improve time management skills.

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FAQs

Are Halogens an important topic in Organic Chemistry for WBJEE 2025?

Yes, Halogens are an important topic in Organic Chemistry for the WBJEE 2025 exam, the topic is part of the Organic Chemistry chapter.
 

What kind of questions are asked from the Organic Chemistry section in the WBJEE 2025 exam?

The organic chemistry section includes questions based on IUPAC nomenclature, compound bonding, and properties of organic compounds. 
 

Where to find the WBJEE 2025 Organic Chemistry practice questions with solutions?

The WBJEE 2025 Organic Chemistry practice questions with solutions are available online, check the article above to get WBJEE 2025 organic chemistry practice questions. 
 

What is the percentage weightage of the Organic Chemistry in the WBJEE 2025 exam?

The percentage weightage of organic chemistry in the WBJEE 2025 exam is around 6%.
 

What is the percentage weightage of the Organic Chemistry in the WBJEE 2025 exam?

The percentage weightage of organic chemistry in the WBJEE 2025 exam is around 6%.
 

How many questions are there from the Organic Chemistry section in the WBJEE 2025 exam?

The Organic Chemistry section in the WBJEE 2025 has a weightage of around 6% and thus can feature 4-5 questions.
 

Is organic chemistry an important topic for WBJEE 2025?

Yes, organic chemistry is one of the most important sections in the WBJEE chemistry syllabus, covering various important fundamentals.  
 

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