List of top Chemistry Questions asked in JEE Main

Which of the following gives positive $\text{Tollen's}$ test ?
Statement-I : $\text{K}>\text{Mg}>\text{Al}>\text{B}$ metallic character order. Statement-II: Ionic radius of any element is less than its atomic radius.
100 mL of a hydrocarbon is mixed with 360 mL of oxygen and ignited. After combustion, the gaseous mixture has a volume of 280 mL at NTP. After passing through KOH, 80 mL of gas remains. The hydrocarbon is:
Electronegativity difference between a group 15 element and $\text{P}$ is less than electronegativity difference between another group 15 element and $\text{P}$. Those group 15 elements respectively are :
Which of the following is the correct order with respect to the property indicated?
$K_2Cr_2O_7 + KI \xrightarrow{H^+} I_2 + Cr^{3+}$
Statement-I : Size of $O^{2-}$ is smaller than $F^-$.
Statement-II: Second ionization energy of $\text{Na}$ is greater than second ionization energy of $\text{Mg}$.
Organic compound (P) $\xrightarrow{(i) \text{ excess of} HI, (ii) \text{ Aq. } NaOH} Q + R$. $Q$ and $R$ both gives Iodoform test, Which among the following is (P) from the given organic compound?
Correct statement is : (A) $\text{NaOCl}$ when reacted with $\text{KI}$ gives $\text{KOI}$ (B) $\text{KOI}$ is best reducing agent (C) Methanoic acid gives iodoform test (D) Isopropyl alcohol gives iodoform test (E) $\text{H}_3\text{C}–\text{CH}=\text{CH}–\text{CO}–\text{CH}_3$ gives iodoform test
Which of the following are isobars?
Consider the following carbocations: (A) $\text{CH}_3\text{C}^+\text{H}_2 \rightarrow \text{B} \rightarrow \text{CH}_3-\text{C}^+\text{H}-\text{CH}_3 \rightarrow \text{C} \rightarrow (\text{CH}_3)_3\text{C}^+$. Statement-I : B is more stable due to $9\alpha H$. Statement-II: A is less stable due to $3\alpha H$.
For given reaction $X_2(g) + Y_2(g) \rightleftharpoons 2Z (g)$. Moles of $X_2, Y_2 & Z$ are at equilibrium are $3 \text{ mole}, 3 \text{ mole} & 9 \text{ mole}$ respectively. If $10 \text{ moles}$ of $Z$ are added at constant $T$ then find moles of $Z$ at re-established equilibrium.
$0.245 \text{ gm}$ of an unknown organic compound gave $0.5453 \text{ gm}$ of $\text{AgCl}$ through Carious method. Calculate $%$ of $\text{Cl}$ in unknown compound.
Identify (A)
. Number of different $\text{H}$-atoms in $(\text{Y})$
In phosphorus estimation, \(0.60\,\text{g}\) of an organic compound gives \(0.93\,\text{g}\) of \( \mathrm{Mg_2P_2O_7} \). Calculate the percentage of phosphorus (nearest integer).

CH$_3$–Br $\xrightarrow{\text{CH$_3$OH/Nu}}$ CH$_3$OH 
Correct order of rate of this reaction for given nucleophile: 
 

When sodium fusion extract of an organic compound was treated with CHCl$_3$, then violet colour of halogen appears. If 0.15 gm of the organic compound gives 0.12 gm of the silver halide, then find the percentage of halide in the organic compound.
Statement-I: Sucrose is dextrorotatory upon hydrolysis it becomes laevorotatory.
Statement-II: Sucrose on hydrolysis gives glucose and fructose such that the levorotation of glucose is more than dexrotation of fructose.
An organic compound with molecular formula C$_8$H$_9$NO when reacts with KOH/BBr$_2$ forms 'P' which on diazotisation forms 'Q' followed by its reaction with CuCN forms 'R' which on hydrolysis (acidic) formed 'S' (S can also be made by hydrolysis of original compound (X) C$_8$H$_9$NO). 'S' can react with KMnO$_4$/H$^+$ forms 'T' which has two types of hydrogen. X will be:
Statement-I:
Major product is ortho substituted product and minor product is para substituted.
Statement-II:
Ortho \& Para substituted products can be separated by steam distillation.
Compare rate of S$_N^1$
Four elements from the second period Boron to Oxygen can have the following IE$_1$ values (in kJ mol$^{-1}$): 1086.5, 800.6, 1313.9, 1402.3. The value of IE$_1$ for Nitrogen is:
Some species are given: \[ \mathrm{Ni^{2+},\ Fe^{2+},\ Co^{2+},\ V^{3+}\ \text{and}\ Ti^{2+}} \] How many species have magnetic moment (spin-only) less than \(3\) BM?
Given below are two statements: Statement-I: The correct order for radius is \[ \mathrm{Al > Mg> Mg^{2+} > Al^{3+}} \] Statement-II: Atomic size always depends on electronegativity. In the light of the above statements, choose the correct option.
Both acetaldehyde and acetone (individually) undergo which of the following reactions?
A. Iodoform Reaction
B. Cannizzaro Reaction
C. Aldol Condensation
D. Tollen's Test
E. Clemmensen Reduction
Choose the correct answer from the options given below: