JEE Main Chemistry — Organic Chemistry previous year questions with solutions.
In the following sequence of reactions the maximum number of atoms present in molecule ‘ $C$ ’ in one plane is_______ $A\overset{Red hot}{\underset{Cu tube}{\rightarrow }}B\overset{C{H}_{3}Cl(1.eq)}{\underset{Anhydrous AlC{l}_{3}}{\rightarrow }}C$ (A is a lowest molecular weight alkyne)
The Kjeldahl method of Nitrogen estimation fails for which of the following reaction products? 
The number of chiral centres present in $[B]$ is _____ 
The number of chiral carbons present in the molecule given below is.............. 
The decreasing order of reactivity towards dehydrohalogenation $({E}_{1})$ reaction of the following compounds is: 
Match the following :<table class="pyq-table"><tbody><tr><th>$(i)$</th><th>Riboflavin</th><th>$(a)$</th><th>Beriberi</th></tr><tr><td>$(ii)$</td><td>Thiamine</td><td>$(b)$</td><td>Scurvy</td></tr><tr><td>$(iii)$</td><td>Pyridoxine</td><td>$(c)$</td><td>Cheilosis</td></tr><tr><td>$(iv)$</td><td>Ascorbic acid</td><td>$(d)$</td><td>Convulsions</td></tr></tbody></table>
For the following reactions  where,  ${k}_{s}$ and ${k}_{e}$ , are respectively, the rate constants for substitution and elimination, and $\mu =\frac{{k}_{s}}{{k}_{e}}$ , the correct option is ________
The increasing order of $p{K}_{b}$ for the following compounds will be : 
Which one of the following compounds possesses the most acidic hydrogen?
Consider the following reaction:  The product $'{X}^{'}$ is used:
Which of the following is not an essential amino acid?
The minimum number of moles of ${O}_{2}$ required for complete combustion of 1 mole of propane and 2 moles of butane is..............
The major aromatic product $C$ in the following reaction sequence will be : 
A flask contains a mixture of isohexane and $3$ -methylpentane. One of the liquids boils at ${63}^{o}C$ while the other boils at ${60}^{o}C.$ What is the best way to separate the two liquids and which one will be distilled out first?
Which of the following compounds produces an optically inactive compound on hydrogenation?
The increasing order of the reactivity of the following compounds in nucleophile addition reaction is: Propanal, Benzaldehyde, Propanone, Butanone
Consider the following reactions,  The compound $[P]$ is:
The major product $[B]$ in the following reaction is : 
Which of the following statements is correct?
Which of these will produce the highest yield Friedel Crafts reaction?
In the following reaction sequence, structures of $A$ and $B$ are, respectively 
A solution of phenol in chloroform when treated with aqueous $\mathrm{NaOH}$ gives compound $P$as a major product. The mass percentage of carbon in $P$ is ______ .
The major product of the following reaction is: 
When neopentyl alcohol is heated with an acid, it slowly converted into an 85 : 15 mixture of alkenes A and B, respectively. What are these alkenes?