JEE Main Chemistry — Organic Chemistry previous year questions with solutions.
 Identify '$Z$' among the following
The reaction of  with bromine and $\mathrm{KOH}$ gives ${\mathrm{RNH}}_{2}$ as the end product. Which one of the following is the intermediate product formed in this reaction?
For the below given cyclic hemiacetal $(X)$, the correct pyranose structure is 
During the denaturation of proteins, which of these structures will remain intact ?
$2.5g$ of protein containing only glycine $({C}_{2}{H}_{5}{\mathrm{NO}}_{2})$ is dissolved in water to make $500\mathrm{mL}$ of solution. The osmotic pressure of this solution at $300K$ is found to be $5.03\times {10}^{-3}$ bar. The total number of glycine units present in the protein is (Given : $R=0.083L\mathrm{bar}{K}^{-1}{\mathrm{mol}}^{-1})$
The number of oxygen present in a nucleotide formed from a base, that is present only in RNA is
In alanylglycylleucylalanylvaline the number of peptide linkages is:
A polysaccharide '$X$' on boiling with dil ${H}_{2}{\mathrm{SO}}_{4}$ at $393K$ under $2-3\mathrm{atm}$ pressure yields '$Y$' '$Y$' on treatment with bromine water gives gluconic acid. '$X$' contains $\beta$-glycosidic linkages only. Compound '$X$' is :
Given below are two statements : Statement I: The esterification of carboxylic acid with an alcohol is a nucleophilic acyl substitution. Statement II: Electron withdrawing groups in the carboxylic acid will increase the rate of esterification reaction. Choose the most appropriate option
 Consider the above reaction, the compound '$A$' is
Which reactant will give the following alcohol on reaction with one mole of phenyl magnesium bromide $(\mathrm{PhMgBr})$ followed by acidic hydrolysis? 
A sample of $0.125g$ of an organic compound when analysed by Duma's method yields $22.78\mathrm{mL}$ of nitrogen gas collected over $\mathrm{KOH}$ solution at $280K$ and $759\mathrm{mmHg}$. The percentage of nitrogen in the given organic compound is____ (a) The vapour pressure of water at $280K$ is $14.2\mathrm{mmHg}$ (b) $R=0.082L\mathrm{atm}{K}^{-1}{\mathrm{mol}}^{-1}$
Given below are two statements : one is labelled as Assertion $A$ and the other is labelled as Reason $R$ Assertion $A$ : Aniline on nitration yields ortho, meta & para nitro derivatives of aniline. Reason $R$ : Nitrating mixture is a strong acidic mixture. In the light of the above statements, choose the correct answer from the options given below
Hydrolysis of which compound will give carbolic acid?
Sugar moiety in DNA and RNA molecules respectively are
Arrange the following in decreasing acidic strength. 
Which will have the highest enol content?
Which of the following is reducing sugar?
The number of chiral alcohol(s) with molecular formula ${C}_{4}{H}_{10}O$ is ________ (Assume stereoisomers as different chiral alcohols)
Product '$A$' of following sequence of reactions is 
In a linear tetrapeptide (Constituted with different amino acids), (number of amino acids) - (number of peptide bonds) is
The major product '$A$' of the following given reaction has ${\mathrm{sp}}^{2}$ hybridized carbon atoms. $2,7$-Dimethyl-$2,6$-octadiene $\overset{{H}^{+}}{\longrightarrow }\underset{\mathrm{Major}\mathrm{Product}}{A}$
In bromination of Propyne, with Bromine $1,1,2,2$-tetrabromopropane is obtained in $27%$ yield. The amount of $1,1,2,2$ tetrabromopropane obtained from $1g$ of Bromine in this reaction is_____$\times {10}^{-1}g$ . (Molar Mass : Bromine $=80g/\mathrm{mol}$)
When sugar '$X$' is boiled with dilute ${H}_{2}{\mathrm{SO}}_{4}$ in alcoholic solution, two isomers '$A$' and '$B$' are formed. '$A$' on oxidation with ${\mathrm{HNO}}_{3}$ yields saccharic acid where as '$B$' is laevorotatory. The compound '$X$' is