JEE Main Chemistry — Organic Chemistry previous year questions with solutions.
Given below are two statements: Statement I: On the basis of inductive effect, the order of stability of alkyl carbanions is CH$_3^- >$ CH$_3$-CH$_2^- >$ (CH$_3$)$_2$CH$^- >$ (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
As compared with chlorocyclohexane, which of the following statements correctly apply to chlorobenzene? A. The magnitude of negative charge is more on chlorine atom. B. The $\mathrm{C}-\mathrm{Cl}$ bond has partial double bond character. C. $\mathrm{C}-\mathrm{Cl}$ bond is less polar. D. $\mathrm{C}-\mathrm{Cl}$ bond is longer due to repulsion between delocalised electrons of the aromatic ring and lone pairs of electrons of chlorine. E. The $\mathrm{C}-\mathrm{Cl}$ bond is formed using $\mathrm{sp}^{2}$ hybridised orbital of carbon. Choose the correct answer from the options given below:
CORRECT order of stability for the following is $\mathrm{CH}_{2}=\mathrm{CH}^{-}, \mathrm{CH}_{3}-\mathrm{CH}_{2}^{-}, \mathrm{CH} \equiv \mathrm{C}^{-}$
 The final product $[\mathrm{B}]$ is :
Consider the following reaction :  The product Y formed is :
Consider the following reactions. Total number of electrons in the $\pi$ bonds and lone pair of electrons in the product $(X)$ is : 
Identify correct statements from the following : A. Propanal and propanone are functional isomers. B. Ethoxyethane and methoxypropane are metamers. C. But-2-ene shows optical isomerism. D. But-1-ene and but-2-ene are functional isomers. E. Pentane and 2, 2-dimethyl propane are chain isomers. Choose the correct answer from the options given below :
From the following, the least stable structure is:
Shown below is the structure of methyl acetate with three different $\alpha$, $\beta$ and $\gamma$ carbon - oxygen bonds.  The correct order of bond lengths of these bonds is :
Arrange the following carbanions in the decreasing order of stability.  Choose the correct answer from the options given below:
For the given molecule, "$x$", the preferred site for the attack of the electrophile is : 
The correct order of the rate of reaction of the following reactants with nucleophile by SN1 mechanism is: (Given : Structure I and II are rigid) 
The strongest conjugate acid will result from:
Structures of four disaccharides are given below. Among the given disaccharides, the non-reducing sugar is :
Complete the following reaction sequence and give the name of major product 'P'. $CH_3-CH_2-C\equiv N \xrightarrow[\text{(ii) } H_3O^+]{\text{(i) } OH^-/H_2O/\Delta} \xrightarrow[\text{(iv) } H_2O]{\text{(iii) } Cl_2/\text{Red P}} P \text{ (Major product)}$
Consider the three aromatic molecules (P, Q and R) whose structures have been given below :  The correct order regarding the reactivity of these compounds with $Ph-N\equiv NCl^{(-)}_{(+)}$ under optimum but slightly acidic medium is :
n-Butane on monochlorination under photochemical condition gives an optically active compound "P". "P" on further chlorination gives dichloro compounds. The number of dichloro compounds obtained (ignore stereoisomers) is:
Match List - I with List - II. $\begin{array}{l} \text{List - I} & \text{List - II} \\ \text{Reagents} & \text{Reaction Name (Involving aldehydes)} \\ \text{A. } \mathrm{H}_{2}, \mathrm{Pd}-\mathrm{BaSO}_{4} & \text{I. Etard Reaction} \\ \text{B. } \mathrm{SnCl}_{2}, \mathrm{HCl} & \text{II. Rosenmund Reduction} \\ \text{C. } \mathrm{CrO}_{2} \mathrm{Cl}_{2}, \mathrm{CS}_{2} & \text{III. Gatterman - Koch Reaction} \\ \text{D. } \mathrm{CO}, \mathrm{HCl}, \text{ Anhyd. } \mathrm{AlCl}_{3} & \text{IV. Stephen Reaction} \end{array}$ Choose the correct answer from the options given below :
Arrange the following compounds according to increasing order of boiling points. $n\text{-}\text{C}_4\text{H}_9\text{OH}$ (A), $n\text{-}\text{C}_4\text{H}_9\text{NH}_2$ (B), $n\text{-}\text{C}_4\text{H}_{10}$ (C) and $\text{C}_2\text{H}_5\text{NHC}_2\text{H}_5$ (D).
Identify the incorrect statement about tertiary structure of proteins.
Consider the isomers of hydrocarbon with molecular formula $C_5H_{10}$. These isomers do not decolourise $KMnO_4$ solution. These isomers are subjected to chlorination with chlorine in presence of light to give monochloro compounds. The total number of monochloro compounds (structural isomers only) formed is _______.
Arrange the following alkenes in decreasing order of stability.  Choose the correct answer from the options given below:
Given below are two statements: Statement I: Benzene is nitrated to give nitrobenzene, which on further treatment with $\mathrm{CH}_{3} \mathrm{COCl} / \mathrm{AlCl}_{3}$ will give  Statement II: $-\mathrm{NO}_{2}$ group is a $m$-directing, and deactivating group. In the light of the above statements, choose the most appropriate answer from the options given below
Given below are two statements: Statement I: $\left(\mathrm{CH}_{3}\right)_{3} \stackrel{\oplus}{\mathrm{C}}$ is more stable than $\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_{3}$ as nine hyperconjugation interactions are possible in $\left(\mathrm{CH}_{3}\right)_{3} \stackrel{\oplus}{\mathrm{C}}$. Statement II: $\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_{3}$ is less stable than $\left(\mathrm{CH}_{3}\right)_{3} \stackrel{\oplus}{\mathrm{C}}$ as only three hyperconjugation interactions are possible in $\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_{3}$. In the light of the above statements, choose the correct answer from the options given below