JEE Main Chemistry — Organic Chemistry previous year questions with solutions.
Identify the essential amino acids from below : (A) Valine (B) Proline (C) Lysine (D) Threonine (E) Tyrosine Choose the correct answer from the options given below :
In the sulphur estimation, 0.20 g of a pure organic compound gave 0.40 g of barium sulphate. The percentage of sulphur in the compound is ______ $\times 10^{-1} \%$. (Molar mass : $\mathrm{O}=16, \mathrm{~S}=32, \mathrm{Ba}=137$ in $\mathrm{g} \mathrm{mol}^{-1}$ )
Which one of the following reaction sequences will give an azo dye?
During " S " estimation, 160 mg of an organic compound gives 466 mg of barium sulphate. The percentage of Sulphur in the given compound is _______ %. (Given molar mass in $\mathrm{g} \mathrm{mol}^{-1}$ of $\mathrm{Ba}: 137, \mathrm{~S}: 32, \overline{\mathrm{O}: 16}$ )
Identify $[\mathrm{A}],[\mathrm{B}]$, and $[\mathrm{C}]$, respectively in the following reaction sequence : 
Which one of the following, with HBr will give a phenol?
How many different stereoisomers are possible for the given molecule? 
The total number of compounds from below when treated with hot $\mathrm{KMnO}_4$ giving benzoic acid is : 
The correct order of stability of following carbocations is : 
Given below are two statements: Statement I: The conversion proceeds well in the less polar medium. $\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{Cl} \xrightarrow{\mathrm{HO}^{-}} \mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{OH}+\mathrm{Cl}^{(-)}$ Statement II: The conversion proceeds well in the more polar medium.  In the light of the above statements, choose the correct answer from the options given below
Number of molecules from below which cannot give ioddoform reaction is : Ethanol, Isopropyl alcohol, Bromoacetone, 2-Butanol, 2-Butanone, Butanal, 2-Pentanone, 3-Pentanone, Pentanal and 3-Pentanol
The descending order of basicity of following amines is:  Choose the correct answer from the options given below :
In which pairs, the first ion is more stable than the second? 
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 $300 \mathrm{~K}=15 \mathrm{~mm} \mathrm{Hg}$)
An organic compound (X) with molecular formula $\mathrm{C}_3 \mathrm{H}_6 \mathrm{O}$ is not readily oxidised. On reduction it gives $\mathrm{C}_3 \mathrm{H}_8 \mathrm{O}(\mathrm{Y})$ which reacts with HBr to give a bromide (Z) which is converted to Grignard reagent. This Grignard reagent on reaction with (X) followed by hydrolysis give 2,3-dimethylbutan-2-ol. Compounds $(\mathrm{X}),(\mathrm{Y})$ and $(\mathrm{Z})$ respectively are :
Which compound would give 3-methyl-6oxoheptanal upon ozonolysis?
In the following substitution reaction:  product \({ }^{\prime} \mathrm{P}^{\prime}\) formed is :
The product (A) formed in the following reaction sequence is 
Given below are two statements : Statement I : One mole of propyne reacts with excess of sodium to liberate half a mole of $\mathrm{H}_2$ gas. Statement II : Four g of propyne reacts with $\mathrm{NaNH}_2$ to liberate $\mathrm{NH}_3$ gas which occupies 224 mL at STP. In the light of the above statements, choose the most appropriate answer from the options given below:
Identify correct statement/s : (A) $-\mathrm{OCH}_3$ and $-\mathrm{NHCOCH}_3$ are activating group. (B) -CN and -OH are meta directing group. (C) -CN and $-\mathrm{SO}_3 \mathrm{H}$ are meta directing group. (D) Activating groups act as ortho - and para directing groups. (E) Halides are activating groups. Choose the correct answer from the options given below :
Predict the major product of the following reaction sequence :- 
Which one of the carbocations from the following is most stable?
The sequence from the following that would result in giving predominantly $3,4,5$-Tribromoaniline is :
