List of top Chemistry Questions asked in JEE Main

Aniline (9.3 g) on reaction with acetic anhydride forms X (11 g). Find the percentage yield of the reaction.

Statement-I: RMgX reacts with CO$_2$ followed by acidification to form product, which reacts with NH$_3$/Δ and then reacts with NaOCl to form product which further reacts with CHCl$_3$/NaOH and final product is R–N≡C.
Statement-II: R–N≡C on hydrolysis gives RCOOH.

Match the list-I and list-II name of reagent.
List-I (1) Baeyer's reagent
(2) Cerric Ammonium nitrate
(3) Tollen's reagent
(4) Neutral FeCl$_3$
List-II (P) Violet colour
(Q) Red
(R) Silver mirror
(S) Pink colour disappears

Compare rate of nitration in decreasing order:

Which of the following reactions yield alcohol as the major product:

Given the reaction sequence:

The percentage of Nitrogen in compound E is:

Observe the following reaction sequence:
\[ \text{C}_4\text{H}_8 \xrightarrow{\text{HCl}} \text{C}_4\text{H}_7\text{Cl} \xrightarrow{\text{NH}_3} \text{C}_4\text{H}_9\text{NH}_2 \xrightarrow{\text{NaNO}_2 + \text{HCl}} \text{C}_4\text{H}_9\text{OH} \] Which of the following is the correct structure for A, B, and C?

When a nitro group is attached to a benzene ring, what effect do we observe towards reactions:

[(I)] Deactivating towards electrophilic substitution
[(II)] Activating towards electrophilic substitution
[(III)] Deactivating towards nucleophilic substitution
[(IV)] Activating towards nucleophilic substitution
Find the correct statements:

Consider the following anions: (i) $\text{CH}_3-\text{CH}_2^-$, (ii) $\text{CH}_2=\text{CH}^-$, (iii) $\text{HC}\equiv\text{C}^-$. Correct stability order of given anions is

In ‘S’ estimation, \(0.314\,\text{g}\) of an organic compound gave \(0.4813\,\text{g}\) of barium sulphate. What is the percentage (%) of sulphur in the organic compound? (Report to nearest integer)

All possible isomers of C$_3$H$_7$Br when reacted with aq. KOH. Find out total number of optically active products (without rearrangement).

An organic compound contains C, H and O. 0.25 g of organic compound on combustion produces CO$_2$(g) and H$_2$O(l). When residual gases pass through KOH solution, its mass increases by 0.18 g and when passed through anhydrous CaCl$_2$, the increase in mass of CaCl$_2$ is 0.15 g. Find the mass % of oxygen in the organic compound.

Which of the following are {insoluble in alkali} when reacted with Hinsberg reagent?

What is the mass (in mg) of final product (C)? \[ \text{CH}_3\text{C}\text{NO}_2 \xrightarrow{\text{(i) Sn/HCl}} \text{CH}_3\text{C}\text{OOCOCH}_3 \xrightarrow{\text{(ii) pH neutral}} \text{CH}_3\text{C}\text{OH} \xrightarrow{\text{Br}_2/\text{Ac}} \text{Product (C)} \] Given: 137 mg of the starting compound.

(X) \(\text{NH}_3\), \(\Delta\) \(\longrightarrow\) (A)
(i) KOH + Br$_2$
(ii) CHCl$_3$, NaOH
X will be:

5.8 g of Aniline is converted into benzanilide with some reaction sequences. Calculate the mass of benzanilide formed, if percentage yield of reaction is 82%. \[ \text{Ph} - \text{COCl} + \text{PhNH}_2 \xrightarrow{\text{Py}} \text{Benzanilide} \]

Which of the following will behave as the best reducing agent? Given \[ \text{Al}^{3+} + 3e^- \rightarrow \text{Al} \quad E^\circ = -1.66 \, \text{V} \] \[ \text{Co}^{3+} + e^- \rightarrow \text{Co}^{2+} \quad E^\circ = 1.81 \, \text{V} \] \[ \text{Fe}^{3+} + e^- \rightarrow \text{Fe}^{2+} \quad E^\circ = 0.77 \, \text{V} \] \[ \text{Cd}^{2+} + 2e^- \rightarrow \text{Cd} \quad E^\circ = -0.4 \, \text{V} \]

Given below are two statements. Statement I: First ionisation enthalpy of Cr is greater than that of Mn. Statement II: Second and third ionisation enthalpies of Cr are less than that of Mn. In the light of above statements, choose the correct option.

Which of the following is the correct IUPAC name of the complex [Ni(PPh\(_3\))\(_3\)(H\(_2\)O)\(_3\)]Cl\(_2\)?

Match the two columns: based on the reaction Glucose + 'X' → 'P' List-I (Reagent-X) A. Br\(_2\)/water
B. Acetic anhydride (excess)
C. Conc. HNO\(_3\)
D. NH\(_2\)OH
List-II (Product-P) (i) Glucose oxime
(ii) Saccharic acid
(iii) Glucose pentaacetate
(iv) Gluconic acid

Consider two reactions having the same pre-exponential factor (A) occurring at the same temperature (T). \[ A \xrightarrow{E_{a1}} B \] \[ C \xrightarrow{E_{a2}} D \] \[ E_{a1} = 5E_{a2} \] Find out the correct expression.

Consider the given species: H\(_2\)S, H\(_2\)O, NH\(_3\), NF\(_3\), CHCl\(_3\) The number of lone pairs on the central atom which has the lowest dipole moment is: