Hydrocarbons JEE Mains Questions - List Of Most Asked Questions With Solutions

NTA will shortly release the JEE Main Syllabus 2025 at jeemain.nta.ac.in. Last Year, the complete syllabus of JEE Main underwent some major changes. According to the latest syllabus guidelines, the weightage of Physics has dropped to 22.5%. Due to these changes in the syllabus, certain shifts in chapter-wise weightage have been observed. Hydrocarbons are among such topics. It’s among the least weightage topics in JEE Main Physics Syllabus 2025. This chapter holds 1.39% weightage in the whole syllabus.

• Hydrocarbons is a part of the General Physics section, and every year around 2-3 questions are asked from this chapter. Due to the drop in weightage, you can expect 1-2 questions in JEE Main 2025.
• Hydrocarbons in JEE Mains Physics Syllabus 2025 covers all the basic concepts on units and measurements, fundamentals of units, dimensions etc.

Aspirants consider Hydrocarbons as one of the Easiest Chapters in Physics for JEE Main 2025. Even though this chapter has the least weightage in the syllabus, to develop a strong foundation in physics, this particular chapter plays a pivotal role. Hence the candidates need to develop a clear understanding of this chapter. The list of most asked questions from this chapter will help the students with their preparation.

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Some of the most important topics for JEE Main hydrocarbons include:

• Nomenclature: How hydrocarbons are named
• Classification: How hydrocarbons are categorized
• Isomerism: How hydrocarbons exhibit isomerism
• Physical properties: The physical properties of hydrocarbons
• Chemical properties: The chemical properties of hydrocarbons
• Reactions: The reactions of hydrocarbons
• Alkanes: The properties of alkanes
• Alkenes: The properties of alkenes
• Alkynes: The properties of alkynes
• Aromatic hydrocarbons: The properties of aromatic hydrocarbons

Hydrocarbons JEE Mains Questions -

List Of Most Asked Questions With Solutions

In the (JEE) Main, the topic of Physics and Measurement often features questions that have appeared multiple times in previous years. Many questions in this section are either repeated or follow similar patterns, with only minor changes, such as different numerical values or slight modifications in wording.Certain questions have been repeated as many as five times.

Here are some of the most frequently asked and repeated questions:

Question 1:

What is the hybridization of the central atom in the complex [Ni(CO)4]? This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024

Options:

A) sp

B) sp2

C) sp3

D) dsp2

Solution:

The hybridization of Ni in [Ni(CO)4] is sp3 because it has four bonding pairs of electrons.

Year: 2021

Question 2:

Which of the following is a correct statement about alkanes? This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024

Options:

A) They are saturated hydrocarbons

B) They contain at least one double bond

C) They are unsaturated hydrocarbons

D) They have a general formula CnH2n

Solution:

Alkanes are saturated hydrocarbons with the general formula CnH2n+2. Therefore, the correct answer is A.

Year: 2020

Question 3:

Which of the following complexes is paramagnetic? This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024

Options:

A) [Fe(CN)6]3-

B) [Co(NH3)6]3+

C) [Ni(CO)4]

D) [Cu(NH3)4]2+

Solution:

[Cu(NH3)4]2+ is paramagnetic due to the presence of unpaired electrons. Correct answer is D.

Year: 2019

Question 4:

What type of reaction occurs when an alkene is converted to an alkane? This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024

Options:

A) Addition

B) Substitution

C) Elimination

D) Rearrangement

Solution:

The conversion of an alkene to an alkane involves an addition reaction where hydrogen is added across the double bond.

Year: 2018

Question 5:

What is the geometry of the complex [PtCl4]2-? This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024

Options:

A) Tetrahedral

B) Square planar

C) Octahedral

D) Linear

Solution:

The geometry of [PtCl4]2- is square planar due to the dsp2 hybridization.

Year: 2017

Question 6:

Which of the following hydrocarbons is a cyclic alkane? This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024

Options:

A) C2H6

B) C3H6

C) C5H10

D) C6H12

Solution:

Cycloalkanes are saturated hydrocarbons with rings. C6H12 represents cyclohexane, making it the cyclic alkane. Correct answer is D.

Year: 2016

Question 7:

What is the IUPAC name of the compound CH3-CH2-CH2-CHO? This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024

Options:

A) Butanal

B) Propanal

C) Pentanal

D) Hexanal

Solution:

The IUPAC name of CH3-CH2-CH2-CHO is butanal as it has a four-carbon chain with an aldehyde functional group.

Year: 2015

Question 8:

Which of the following ligands is a strong field ligand? This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024

Options:

A) I-

B) Br-

C) F-

D) CN-

Solution:

CN- is a strong field ligand that causes a large splitting of d-orbitals.

Year: 2014

Question 9:

Which of the following statements about alkenes is true? This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024

Options:

A) They contain only single bonds

B) They can undergo hydrogenation

C) They are saturated hydrocarbons

D) They have the general formula CnH2n

Solution:

Alkenes have the general formula CnH2n and contain at least one double bond. Thus, B is true as they can undergo hydrogenation.

Year: 2013

Question 10:

The coordination compound [Fe(CN)6]4- is: This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024

Options:

A) Paramagnetic

B) Diamagnetic

C) Ferromagnetic

D) Antiferromagnetic

Solution:

[Fe(CN)6]4- is diamagnetic due to the absence of unpaired electrons.

Year: 2012