List of top Chemistry Questions asked in JEE Main

But-2-ene on reaction with alkaline \(\mathrm{KMnO_4}\) at elevated temperature followed by acidification will give :

The major product of the following reaction is :

The major product(s) obtained in the following reaction is/are :

The correct statement is :

The correct match between Item-I and Item-II is :

	Item - I		Item - II
(a)	High density polythene	(I)	Peroxide catalyst
(b)	Polyacrylonitrile	(II)	Condensation at high temperature & pressure
(c)	Novolac	(III)	Ziegler-Natta Catalyst
(d)	Nylon 6	(IV)	Acid or base catalyst

A hydrated solid X on heating initially gives a monohydrated compound Y. Y upon heating above 373 K leads to an anhydrous white powder Z. X and Z, respectively, are :

Which of the following is not a correct method of the preparation of benzylamine from cyanobenzene ?

The number of pentagons in \(\mathrm{C_{60}}\) and trigons (triangles) in white phosphorus, respectively, are :

The correct option among the following is :

Number of stereo centers present in linear and cyclic structures of glucose are respectively :

Compound A(C₉H₁₀O) shows positive iodoform test. Oxidation of A with KMnO₄/KOH given acid B(C₈H₆O₄). Anhydride of B is used for the preparation of phenolphthalein. Compound A is:

The major product obtained in the given reaction is :

The ratio of the shortest wavelength of two spectral series of hydrogen spectrum is found to be about \(9\). The spectral series are :

In chromatography, which of the following statements is incorrect for R_f ?

The INCORRECT statement is :

The highest possible oxidation states of uranium and plutonium, respectively are :

The difference between \(\Delta H\) and \(\Delta U\) (\(\Delta H-\Delta U\)), when the combustion of one mole of heptane(l) is carried out at a temperature \(T\), is equal to :

Which of these factors does not govern the stability of a conformation in acyclic compounds?

The minimum amount of \(\mathrm{O_2(g)}\) consumed per gram of reactant is for the reaction :
(Given atomic mass : Fe = 56, O = 16, Mg = 24, P = 31, C = 12, H = 1)

The major product 'Y' in the following reactions is :

For the reaction,
\(\mathrm{2SO_2(g)+O_2(g)\rightleftharpoons 2SO_3(g)}\), \(\Delta H=-57.2\ \mathrm{kJ\,mol^{-1}}\) and \(K_C=1.7\times10^{16}\)
Which of the following statement is incorrect ?

Which one of the following graphs between molar conductivity (\(\Lambda_m\)) versus \(\sqrt{C}\) is correct ?

The major product 'Y' in the following reaction is :

The correct order of catenation is :

Consider the following table :

Gas	\(a/(\mathrm{kPa\ dm^6\ mol^{-1}})\)	\(b/(\mathrm{dm^3\ mol^{-1}})\)
A	642.32	0.05196
B	155.21	0.04136
C	431.91	0.05196
D	155.21	0.4382

\(a\) and \(b\) are van der Waals constants. The correct statement about the gases is :