JEE Main Chemistry — Organic Chemistry previous year questions with solutions.
The major product $[R]$ in the following sequence of reaction is : 
The major product in the following reaction is : 
Which of the following statement is not true for glucose?
What is the product of following reaction?  ?
An organic compound [A], molecular formula ${C}_{10}{H}_{20}{O}_{2}$ was hydrolyzed with dilute sulphuric acid to given a carboxylic acid [B] and an alcohol [C]. Oxidation of [C] with ${\mathrm{CrO}}_{3}-{H}_{2}{\mathrm{SO}}_{4}$ produced [B]. Which of the following structures are not possible for $[A]$
The increasing order of ${\mathrm{pK}}_{b}$ values of the following compounds is : 
The increasing order of basicity of the following compounds is : 
The increasing order of the acidity of the $\alpha$-hydrogen of the following compounds is:  $(A)(B)(C)(D)$
The decreasing order of reactivity of the following organic molecules towards ${\mathrm{AgNO}}_{3}$ solution is: 
The increasing order of the following compounds towards $\mathrm{HCN}$ addition is : (i)  (ii)  (iii)(iv) 
The major product in the following reaction is: 
The correct match between Item-I (starting material) and Item-II (reagent) for the preparation of benzaldehyde is : <table class="pyq-table"><tbody><tr><td></td><td>Item-I</td><td></td><td>Item-II</td></tr><tr><td>(I)</td><td>Benzene</td><td>(P)</td><td>$\mathrm{HCl}$ and ${\mathrm{SnCl}}_{2},{H}_{3}O+$</td></tr><tr><td>(II)</td><td>Benzonitrile</td><td>(Q)</td><td>${H}_{2},\mathrm{Pd}-{\mathrm{BaSO}}_{4},S$ and quinoline</td></tr><tr><td>(III)</td><td>Benzoyl Chloride</td><td>(R)</td><td>$\mathrm{Co},\mathrm{HCl}\mathrm{and}{\mathrm{AlCl}}_{3}$</td></tr></tbody></table>
Which of the following will react with ${\mathrm{CHCl}}_{3}+\mathrm{alc}.\mathrm{KOH}$?
Arrange the following labelled hydrogens in decreasing order of acidity: 
Three isomers A, B and C (mol. formula ${C}_{8}{H}_{11}N$ ) give the following results: $A$ and $C$$\overset{\mathrm{Dianotization}}{\rightarrow }P+Q\rightarrow _{(\mathrm{ii})\mathrm{acidation} ({\mathrm{KMnO}}_{4}+{H}^{+})}^{(i)\mathrm{Hydrolyds}}R(\mathrm{product}\mathrm{of}A)+S(\mathrm{product}\mathrm{of}C)$ R has lower boiling point than S $B\overset{{C}_{6}{H}_{5}{\mathrm{SO}}_{2}\mathrm{Cl}}{\rightarrow }$ alkali-insoluble product $A,B$ and $C,$ respectively are:
The mechanism of Sn1 reaction is given as: $R-X\longrightarrow {R}^{\oplus }{X}^{\ominus }\longrightarrow {R}^{\oplus }\|{X}^{\ominus }\overset{{Y}^{\ominus }}{\longrightarrow }R-Y+{X}^{\ominus } \mathrm{lon}\mathrm{pair}\mathrm{Solvent} \mathrm{Speparated}\mathrm{ion} \mathrm{pair}$ A student writes general characteristics based on the given mechanism as : (a) The reaction is favoured by weak nucleophiles. (b) ${R}^{\oplus }$ would be easily formed if the substituents are bulky $y$ (c) The reaction is accompanied by recemization (d) The reaction is favoured by non-polar solvents. Which observations are correct?
Identify $(A)$ in the following reaction sequence: 
The decreasing order of basicity of the following amines is: 
Consider the following reactions: $(a)$ ${(C{H}_{3})}_{3}CCH(OH)C{H}_{3}\overset{conc.{H}_{2}S{O}_{4}}{\rightarrow }$ $(b)$ ${(C{H}_{3})}_{2}CHCH(Br)C{H}_{3}\overset{alc.KOH}{\rightarrow }$ $(c)$ ${(C{H}_{3})}_{2}CHCH(Br)C{H}_{3}\overset{{(C{H}_{3})}_{3}{O}^{\ominus }{K}^{\oplus }}{\rightarrow }$ $(d)$  Which of the reaction(s) will not produce Saytzeff product?
An unsaturated hydrocarbon $X$ absorbs two hydrogen molecules on catalytic hydrogenation, and also gives following reaction: $X\overset{(i){O}_{3}}{\underset{\frac{(\mathrm{ii})\mathrm{Zn}}{{H}_{2}O}}{\rightarrow }}A\overset{{[\mathrm{Ag}{({\mathrm{NH}}_{3})}_{2}]}^{+}}{\rightarrow }B$ (3-oxo-hexanedicarboxylic acid) $X$ will be:
The major product $[C]$ of the following reaction sequence will be : 
Consider the following reactions $A\frac{(i)C{H}_{3}MBr}{(ii){H}_{3}{O}^{+}}B\frac{Cu}{573K}2-methyl-2-butene$ . The mass percentage of carbon in $A$ is _____________.
The number of chiral centres present in threonine is _________
The number of  groups present in a tripeptide Asp – Glu – Lys is ____