Chemistry Organic Chemistry questions from JEE Main 2019.
A compound 'X' on treatment with Br $/ \mathrm{NaOH}$, provided $\mathrm{C}_{3} \mathrm{H}_{9} \mathrm{~N},$ which gives positive carbylamine test. Compound $\mathrm{X}^{\prime}$ is:
Acid strength given below the correct decreasing order will be :
Among the following compounds most basic amino acid is:
Among the following compounds, which one is found in RNA?
Among the following four aromatic compounds, which one will have the lowest melting point?
Amylopectin is composed of:
An aromatic compound $'A'$ having molecular formula ${C}_{7}{H}_{6}{O}_{2}$, on treating with aqueous ammonia and heating forms compound $'B'$. The compound $'B'$ on reaction with molecular bromine and potassium hydroxide provides compound $'C'$ having molecular formula ${C}_{6}{H}_{7}N$. The structure of $'A'$ is:
An ‘Assertion’ and a ‘Reason’ is given below. Choose the correct answer from the following options: Assertion $(A)$: Vinyl halides do not undergo nucleophilic substitution easily. Reason $(R)$: Even though the intermediate carbocation is stabilized by loosely held $\pi -$ electrons, the cleavage is difficult because of the strong bonding.
An organic compound is estimated through Dumas method and was found to evolve 6 moles of $\mathrm{CO}_{2}, 4$ moles of $\mathrm{H}_{2} \mathrm{O}$ and 1 mole of nitrogen gas. The formula of the compound is:
An organic compound neither reacts with neutral ferric chloride solution nor with Fehling solution. It however, reacts with Grignard reagent and given positive iodoform test. The compound is:
An organic compound $‘X’$ showing the following solubility profile is: 
Aniline dissolved in dilute $HCl$ is reacted with sodium nitrite at $0^{\circ}C$. This solution was added dropwise to a solution containing an equimolar mixture of aniline and phenol in dilute $HCl$. The structure of the major product is
Arrange the following amines in the decreasing order of basicity. 
Benzene diazonium chloride on reaction with aniline in the presence of dilute hydrochloric acid gives:
But-2-ene on reaction with alkaline $KMn{O}_{4}$ at elevated temperature followed by acidification will give:
Compound $A({C}_{9}{H}_{10}O)$ shows positive iodoform test. Oxidation of A with $KMn{O}_{4}/KOH$ gives acid $B({C}_{8}{H}_{6}{O}_{4})$ . Anhydride of B is used for the preparation of phenolphthalein. Compound A is:
Consider the following reactions:  ‘A’ is:
Coupling of benzene diazonium chloride with $1-naphthol$ in alkaline medium will give:
Ethylamine $({C}_{2}{H}_{5}N{H}_{2})$ can be obtained from N-ethylphthalimide on treatment with:
Fructose and glucose can be distinguished by:
Glucose and Galactose are having identical configuration in all the positions except position.
Heating of 2-chloro-1-phenylbutane with $EtOK/EtOH$ gives $X$ as the major product. Reaction $X$ with $Hg{(OAc)}_{2}/{H}_{2}O$ followed by $NaB{H}_{4}$ gives $Y$ as the major product. $Y$ is:
Hinsberg’s reagent is:
If Dichloromethane (DCM) and water ${\text{H}}_{2}\text{O}$ are used for differential extraction, which one of the following statements is correct?
In chromatography, which of the following statements is incorrect for ${R}_{f}$?
In the following compound,  the favourable site/s for protonation is/are :
In the following compounds, the decreasing order of basic strength will be:
In the following reaction carbonyl compound $+MeOH\overset{HCl}{\rightleftharpoons }acetal$ Rate of the reaction is the highest for:
In the following reaction $\mathrm{Aldehyde}+\mathrm{Alcohol}\overset{\mathrm{HCl}}{\rightarrow }\mathrm{Acetal}$<table class="pyq-table"><tbody><tr><td>$Aldehyde$</td><td>$Alcohol$</td></tr><tr><td>$\mathrm{HCHO}$</td><td>$t-\mathrm{BuOH}$</td></tr><tr><td>${\mathrm{CH}}_{3}\mathrm{CHO}$</td><td>$\mathrm{MeOH}$</td></tr></tbody></table>The best combination is:
In the following reactions, products $A$ and $B$ are:  
In the following skew conformation of ethane, ${H}^{'}-C-C-{H}^{''}$ dihedral angle is: 
In the reaction given below what will be the major product at the end : 
Increasing order of reactivity of the following compounds for ${S}_{N}1$ substitution is: 
Increasing rate of ${S}_{N}1$ reaction in the following compounds is: (I) (II)  (III) (IV) 
 cannot be prepared by:
Major product of the given reaction is: 
Major products of the following reaction are: 
Maltose on treatment with dilute $HCl$ gives:
Number of stereo centers present in linear and cyclic structures of glucose are respectively:
p-Hydroxybenzophenone upon reaction with bromine in carbon tetrachloride gives:
Polysubstitution is a major drawback in:
The aldehydes which will not form Grignard product with one equivalent of Grignard reagents are $(A)$  $(B)$  $(C)$  $(D)$ 
The compounds $A$ and $B$ in the following reaction are, respectively: 
The correct IUPAC name of the following compound is: 
The correct match between item $I$ and item $\mathrm{II}$ is <table class="pyq-table"><tbody><tr><td colspan="2">Item $I$ (Compound)</td><td colspan="2">Item $\mathrm{II}$ (Reagent)</td></tr><tr><td>$a.$</td><td>Lysine</td><td>$p.$</td><td>$1-$naphthol</td></tr><tr><td>$b.$</td><td>Furfural</td><td>$q.$</td><td>Ninhydrin</td></tr><tr><td>$c.$</td><td>Benzyl alcohol</td><td>$r.$</td><td>${\mathrm{KMnO}}_{4}$</td></tr><tr><td>$d.$</td><td>Styrene</td><td>$s.$</td><td>Ceric ammonium nitrate</td></tr></tbody></table>
The correct match between Item I and Item II is: 
The correct match between items I and II is : 
The correct order for acid strength of compounds $\mathrm{CH}\equiv \mathrm{CH}, {\mathrm{CH}}_{3}-C\equiv \mathrm{CH}$ and ${\mathrm{CH}}_{2}={\mathrm{CH}}_{2}$ is as follows:
The correct sequence of amino acids present in the tripeptide given below is: 
The correct structure of histidine in a strongly acidic solution $(\mathrm{pH}=2)$ is
The correct structure of the product $‘P’$ in the following reaction is $\mathrm{Asn}-\mathrm{Ser}+\underset{(\mathrm{excess})}{{({\mathrm{CH}}_{3}\mathrm{CO})}_{2}O}\overset{{\mathrm{NEt}}_{3}}{\rightarrow }P$
The decreasing order of ease of alkaline hydrolysis for the following esters is 
The highest value of the calculated spin only magnetic moment (in $\mathrm{BM}$) among all the transition metal complexes is
The increasing basicity order of the following compounds is:    
The increasing order of nucleophilicity of the following nucleophiles is; 
The increasing order of $\mathrm{pKa}$ of the following amino acids in aqueous solution is Glycine, Aspartate, Lysine, Arginine.
The increasing order of reactivity of the following compounds towards reaction with alkyl halides directly is: $(i)$  $(ii)$  $(iii)$  $(iv)$ 
The increasing order of reactivity of the following compounds towards aromatic electrophilic substitution reaction is: 
The increasing order of the ${pK}_{b}$ of the following compund is: $(A)$  $(B)$  $(C)$  $(D)$ 
The increasing order of the reactivity of the following with $\text{L}\text{i}\text{A}\text{l}{\text{H}}_{4}$ is: $(A)$  $(B)$  $(C)$  $(D)$ 
The increasing order of the reactivity of the following compounds towards electrophilic aromatic substitution reactions is: 
The increasing order of the $pKa$ values of the following compounds is: 
The IUPAC name for the following compound is: 
The major product formed in the following reaction is: 
The major product formed in the reaction given below will be : 
The major product in the following conversion is 
The major product $'Y'$ in the following reaction is: 
The major product $Y$ in the following reaction is: 
The major product in the following reaction is: 
The major product obtained in the following conversion is: 
The major product obtained in the following reaction is: 
The major product obtained in the following reaction is: 
The major product obtained in the following reaction is: 
The major product obtained in the following reaction is: 
The major product obtained in the following reaction is: 
The major product obtained in the given reaction is: 
The major product of the f following reaction is: 
The major product of the following addition reaction is 
The major product of the following reaction is: 
The major product of the following reaction is 
The major product of the following reaction is: 
The major product of the following reaction is: 
The major product of the following reaction is: 
The major product of the following reaction is: 
The major product of the following reaction is: 
The major product of the following reaction is: 
The major product of the following reaction is: 
The major product of the following reaction is:  
The major product of the following reaction is: 
The major product of the following reaction is: 
The major product of the following reaction is: 
The major product of the following reaction is: 
The major product of the following reaction is 
The major product of the following reaction is: 
The major product of the following reaction is: 
The major product of the following reaction is: 
The major product of the following reaction is: 
The major product of the following reaction is: 
The major product of the following reaction is: 
The major product of the following reaction is: 
The major product of the following reaction is 
The major product of the following reaction is 
The major product of the following reaction is: 
The major product of the following reaction is 
The major product of the following reaction is: 
The major product of the following reaction is: $C{H}_{3}CH=CHC{O}_{2}C{H}_{3}\overset{LiAl{H}_{4}}{\rightarrow }$
The major product of the following reaction is : 
The major product of the following reaction is:
The major product of the following reaction is:
The major product of the following reaction 
The major product (s) obtained in the following reaction is/are: 
The major product 'X' formed in the following reaction is: 
The major products $A$ and $B$ for the following reactions are, respectively: 
The major products of the following reaction are: 
The $IUPAC$ name of the following compound is: 
The organic compound that gives following qualitative analysis is:<table class="pyq-table"><tbody><tr><th></th><th>Test</th><th>Inference</th></tr><tr><td>$(a)$</td><td>$Dil.HCl$</td><td>Insoluble</td></tr><tr><td>$(b)$</td><td>$NaOH solution$</td><td>Soluble</td></tr><tr><td>$(c)$</td><td>$B{r}_{2}/water$</td><td>Decolourization</td></tr></tbody></table>
The peptide that gives positive ceric ammonium nitrate and carbylamine tests is:
The principle of column chromatography is:
The products formed in the reaction of cumene with ${O}_{2}$ followed by treatment with dil $\mathrm{HCl}$ are:
The test performed on compound $x$ and their inferences are: <table class="pyq-table"><tbody><tr><td>Test</td><td>Inference</td></tr><tr><td>$(a)$ $2, 4$ - $DNP$ test</td><td>Coloured precipitate yellow</td></tr><tr><td>$(b)$ Iodoform test</td><td>Yellow precipitate</td></tr><tr><td>$(c)$ Azo-dye test</td><td>No dye formation</td></tr></tbody></table>Compound $'x'$ is:
What is the IUPAC name of the following compound? 
What will be the major product in the following mononitration reaction? 
What will be the major product when m-cresol is reacted with propargyl bromide $(HC\equiv C-C{H}_{2}Br)$ in presence of ${K}_{2}C{O}_{3}$ in acetone?
Which amongst the following is the strongest acid?
Which compound (s) out of the following is/are not aromatic? (A) (B) (C) (D)
Which hydrogen in compound $(E)$ is easily replaceable during bromination reaction in presence of light ? 
Which is the most suitable reagent for the following transformation?  
Which of the following amines can be prepared by Gabriel phthalimide reaction?
Which of the following compounds is not aromatic?
Which of the following compounds reacts with ethylmagnesium bromide and also decolourizes bromine water solution?
Which of the following compounds will produce a precipitate with $\mathrm{AgNO}_{3} ?$
Which of the following compounds will show the maximum 'enol' content?
Which of the following is not a correct method of the preparation of benzyl amine from cyano benzene?
Which of the following potential energy $(P.E.)$ diagrams represents the ${\mathrm{SN}}_{1}$ reaction?
Which of the following statements is not true about sucrose?
Which of the following statements is not true about RNA?
Which of the following tests cannot be used for identifying amino acids?
Which of the given statements is incorrect about glycogen?
Which of these factors does not govern the stability of a conformation in acyclic compounds?
Which one of the following alkenes when treated with $HCl$ yields majorly an anti Markovnikov product?
Which one of the following is likely to give a precipitate with $AgN{O}_{3}$ solution?
With dehydrating agent present which dicarboxylic acid is least reactive towards forming an anhydride?