General Organic Chemistry JEE Main previous year questions with solutions

5 solved JEE Main questions on General Organic Chemistry, free to read — no sign-in needed. The full chapter has 367 questions; sign in to attempt the remaining 362 in the exam simulator.

1. Q1JEE Main 2026 (05 Apr, Shift 1)Electron displacement effects
   Given below are two statements: Statement I: On the basis of inductive effect, the order of stability of alkyl carbanions is CH$_3^- \gt$ CH$_3$-CH$_2^- \gt$ (CH$_3$)$_2$CH$^- \gt$ (CH$_3$)$_3$C$^-$. Statement II: Allyl and benzyl carbanions are more stabilised by inductive effect and not by resonance effect. In the light of the above statements, choose the correct answer from the options given below
   1. A.Both Statement I and Statement II are correct
   2. B.Both Statement I and Statement II are incorrect
   3. C.Statement I is correct but Statement II is incorrect
   4. D.Statement I is incorrect but Statement II is correct
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   Answer: (C)

   Statement I is correct because alkyl groups exert a +I effect (electron-donating inductive effect). This increases the electron density on the negatively charged carbon atom, destabilizing the carbanion. Thus, as the number of alkyl groups increases, the stability of the carbanion decreases. The order of stability is $\text{CH}_3^- \gt \text{CH}_3\text{CH}_2^- \gt (\text{CH}_3)_2\text{CH}^- \gt (\text{CH}_3)_3\text{C}^-$. Statement II is incorrect because allyl and benzyl carbanions are highly stabilized by the resonance effect, where the negative charge is delocalized over the adjacent $\pi$ bonds or the benzene ring, rather than by the inductive effect. Answer: Statement I is correct but Statement II is incorrect
2. Q2JEE Main 2025 (04 Apr, Shift 1)Quantitative analysis of organic compounds
   <p>In Dumas' method for estimation of nitrogen 1 g of an organic compound gave 150 mL of nitrogen collected at 300 K temperature and 900 mm Hg pressure. The percentage composition of nitrogen in the compound is _____ $\% (nearest integer). (Aqueous tension at 300 \mathrm{~K}=15 \mathrm{~mm} \mathrm{Hg}$)</p>
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   Answer: 20

   <p>Partial pressure of $\mathrm{N}_2=(900-15)=885 \mathrm{~mm} \mathrm{Hg}$ Mole of&nbsp;</p> <p> $\mathrm{N}_2=\frac{ \left(\frac{885}{760} \times 0.15\right) }{(0.0821 \times 300)}=0.0071$ </p> <p>&nbsp;Moles \% of nitrogen in organic compound $\begin{aligned} & =\frac{(0.0071 \times 28)}{1} \times 10 \\ & =19.85 \% \end{aligned}$</p>
3. Q3JEE Main 2024 (01 Feb, Shift 2)Classification of organic compounds
   Which among the following has highest boiling point?
   1. A.${CH}_{3}{CH}_{2}{CH}_{2}{CH}_{3}$
   2. B.${CH}_{3}{CH}_{2}{CH}_{2}{CH}_{2}-OH$
   3. C.${CH}_{3}{CH}_{2}{CH}_{2}CHO$
   4. D.${H}_{5}{C}_{2}-O-{C}_{2}{H}_{5}$
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   Answer: (B)

   The boiling points of aldehydes and ketones are higher than hydrocarbons and ethers of comparable molecular masses. It is due to weak molecular association in aldehydes and ketones arising out of the dipole-dipole interactions. Also, their boiling points are lower than those of alcohols of similar molecular masses due to absence of intermolecular hydrogen bonding.
4. Q4JEE Main 2022 (25 Jun, Shift 1)IUPAC Nomenclature
   The IUPAC name of ethylidene chloride is
   1. A.$1-$chloroethene
   2. B.$1,2$-dichloroethane
   3. C.$1,1$-dichloroethane
   4. D.1-chloroethyne
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   Answer: (C)

   1,1-dichloroethane Ethylidene chloride is a geminal dihalide with two carbon atoms. In common name system, gem-dihalides are named as alkylidene halides and vic-dihalides are named as alkylene dihalides. The structure of ethylidene chloride is: ${CH}_{3}-{CHCl}_{2}.$
5. Q5JEE Main 2021 (18 Mar, Shift 2)Attacking reagents
   Given below are two statements : Statement I : ${C}_{2}{H}_{5}OH$ and $AgCN$ both can generate nucleophile. Statement II : $KCN$ and $AgCN$ both will generate nitrile nucleophile with all reaction conditions. Choose the most appropriate option :
   1. A.Statement I is true but statement II is false
   2. B.Both statement I and statement II are true
   3. C.Statement I is false but statement II is true
   4. D.Both statement I and statement II are false
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   Answer: (A)

   ${C}_{2}{H}_{5}OH$ and $AgCN$ both can generate nucleophiles. $AgCN$ generate isocyanide as a nucleophile but $KCN$ cyanide as a nucleophile.