List of top Questions asked in JEE Main

The correct order of stability of given carbanions is:

$0.5 \text{ gm}$ of unknown organic compound undergo Duma's method for estimation of nitrogen. Percentage of nitrogen gas collected over water at $P = 715 \text{ mm}$ and $27^\circ \text{C}$ has volume $= 70 \text{ ml}$. Calculate $% \text{ N}$ in the unknown organic compound. ($\text{aq}$. $\text{Tension} = 15 \text{ mm}$)

Statement-I : $\text{CH}_2=\text{CH}-\text{Cl}$ is having stronger $\text{C}-\text{Cl}$ bond then $\text{CH}_3-\text{CH}_2-\text{Cl}$.
Statement-II : $\text{Ph}-\text{C}(\text{Et})(\text{Me})-\text{Cl}$ will rotate the plane polarised light after solvation.

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.

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.

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

Statement (A): Resonating structure with more $\sigma$-bonds charges far apart are more stable.
Statement (B): Unsaturated hydrocarbon shows +I or –I depending upon the group they are attached with.
Statement (C): Carbanion with more % s character are more stable.
Statement (D): In nucleophilic addition to carbonyl group –E (electron-withdrawing) effect is responsible while in electrophilic additions +E is responsible.
Statement (E): Alkene having more alkyl groups have more heat of hydrogenation.
How many statements are correct?

Consider the following reaction sequence:

The organic products ‘A’ and ‘B’ can be separated by:

Consider the following ions:

\[ \text{(I)}\ \mathrm{CH_3-CH_2^-} \qquad \text{(II)}\ \mathrm{CH_2=CH^-} \qquad \text{(III)}\ \mathrm{HC \equiv C^-} \]

The stability of the ions is in the order:

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

Select the correct statement regarding compounds P, Q, R, S.
Structures: P = Acetophenone, Q = Phenylacetaldehyde, R = Cinnamyl alcohol, S = Acetophenone.

Find correct order of acidic strength in the following reaction products $P, Q, R \& S$:

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

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)

‘X’ $\xrightarrow[(2)\ \mathrm{H_2O}]{(1)\ \mathrm{NaNO_2/HCl}}$ $\xrightarrow[\ ]{\mathrm{NaOH/I_2}}$ ‘Y’ (gives positive iodoform test):
X has $%C = 65.75%$, $%H = 15.25%$, $%N = 19%$.
Identify ‘X’ among the following:

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:

Which pair among the following compounds have equal number of hyperconjugation:

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

Find work done in bringing charge q = 3nC from infinity to point A as shown in the figure :

An ideal solenoid is kept with its axis vertical. Current $I_0$ is flowing in the solenoid. A charge $Q$ is thrown downward inside the solenoid. The acceleration of the charged particle is then

The equilateral triangular frame has current 2A. The side of frame is $4\sqrt{3}$ cm. Magnetic field at center C is:

A bar magnet is kept such that it is making an angle of 30$^\circ$ with the magnetic field. The torque acting on the magnet is 0.016 N-m. Find the amount of work done by external agent in rotating the magnet from most stable position to most unstable position.

For a circular coil of radius $R$, magnetic field at the center is $B_0 = 16~\mu\text{T}$. What will be the magnetic field on the axis at a distance $x = \sqrt{3}R$ from the center?

Three very long parallel wires carrying current as shown. Find the force acting at 15 cm length of middle wire :