JEE Main Chemistry — Organic Chemistry previous year questions with solutions.
Among the following the number of compounds which will give positive iodoform reaction is _____. (a) $1$-Phenylbutan-$2$-one (b) $2$-Methylbutan-$2$-ol (c) $3$-Methylbutan-$2$-ol (d) $1$-Phenylethanol (e) $3,3$-dimethylbutan-$2$-one (f) $1$-Phenylpropan-$2$-ol
All structures given below are of vitamin $C$. Most stable of them is:
A trisubstituted compound '$A$', ${C}_{10}{H}_{12}{O}_{2}$ gives neutral ${\mathrm{FeCl}}_{3}$ test positive. Treatment of compound '$A$' with $\mathrm{NaOH}$ and ${\mathrm{CH}}_{3}\mathrm{Br}$ gives ${C}_{11}{H}_{14}{O}_{2}$, with hydroiodic acid gives methyl iodide and with hot conc. $\mathrm{NaOH}$ gives a compound $B$, ${C}_{10}{H}_{12}{O}_{2}$. Compound '$A$' also decolorises alkaline ${\mathrm{KMnO}}_{4}$. The number of $\pi$ bond/s present in the compound '$A$' is _____ .
A short peptide on complete hydrolysis produces $3$ moles of glycine $(G)$, two moles of leucine $(L)$ and two moles of valine $(V)$ per mole of peptide. The number of peptide linkages in it are _____ .
A protein ‘$X$’ with molecular weight of $70,000u$, on hydrolysis gives amino acids. One of these amino acid is
' A ' in the given reaction is 
A hydrocarbon 'X' with formula ${C}_{6}{H}_{8}$ uses two moles of ${H}_{2}$ on catalystic hydrogenation of its one mole. On ozonolysis, 'X' yields two moles of methane dicarbaldehyde. The hydrocarbon 'X' is :
A compound $'X'$ when treated with phthalic anhydride in presence of concentrated ${H}_{2}{\mathrm{SO}}_{4}$ yields $'Y'$. $'Y'$ is used as an acid/base indicator. $'X'$ and $'Y'$ are respectively
With respect to the following reaction, consider the given statements:  (A) $o$-Nitroaniline and $p$-nitroaniline are the predominant products. (B) $p$-Nitroaniline and $m$-nitroaniline are the predominant products. (C) ${\mathrm{HNO}}_{3}$ acts as an acid. (D) ${H}_{2}{\mathrm{SO}}_{4}$ acts as an acid. Choose the correct option.
While estimating the nitrogen present in an organic compound by Kjeldahl's method, the ammonia evolved from $0.25g$ of the compound neutralized $2.5\mathrm{mL}$ of $2{\mathrm{MH}}_{2}{\mathrm{SO}}_{4}$. The percentage of nitrogen present in organic compound is _____ .
Which will have the highest enol content?
Which technique among the following, is most appropriate in separation of a mixture of $100\mathrm{mg}$ of $p$-nitrophenol and picric acid?
Which statement is NOT correct for p-toluenesulphonyl chloride?
Which reactant will give the following alcohol on reaction with one mole of phenyl magnesium bromide $(\mathrm{PhMgBr})$ followed by acidic hydrolysis? 
Which one of the following techniques is not used to spot components of a mixture separated on thin layer chromatographic plate?
Which one of the following reactions does not represent correct combination of substrate and product under the given conditions?
Which one of the following is a water soluble vitamin, that is not excreted easily?
Which one of the following compounds is inactive towards ${S}_{N}1$ reaction?
Which of the following structures are aromatic in nature? 
Which of the following reagents / reactions will convert '$A$' to '$B$'? 
Which of the following reactions will yield benzaldehyde as a product? 
Which of the following ketone will NOT give enamine on treatment with secondary amines? [where $t-\mathrm{Bu}$ is $-C{({\mathrm{CH}}_{3})}_{3}$]
Which of the following is reducing sugar?
Which of the following is not an example of benzenoid compound?