List of top Questions asked in JEE Main

The two monomers for the synthesis of Nylon 6, 6 are

Among the following the false statement is -

The compound that is NOT a common component of photochemical smog is :

The major product of the following reaction is –

(Reactant: an aryl acetate, \(\mathrm{CH_3COO}\)-C₆H₄-\(\mathrm{CH_2CH_2CH_2NH_2}\), with the two substituents meta to each other. Reagents: (i) \(\mathrm{NaNO_2/H^+}\); (ii) \(\mathrm{CrO_3/H^+}\); (iii) \(\mathrm{H_2SO_4}\) (conc.), \(\Delta\).)

The major product of the following reaction is –

(The reactant is a bicyclic compound (an octahydroindene: six-membered ring fused to a five-membered ring) carrying an isopropenyl group, \(\mathrm{C(CH_3)=CH_2}\), on the five-membered ring carbon that also bears an H; reagent: HCl.)

The major product of the following reaction is :
\(\mathrm{CH_3CH_2CH(Br)CH_2Br}\) (Br on the 2nd and 1st carbon; written as CH₃CH₂CH-CH₂ with Br below each of the last two carbons)
Reagents: (i) KOH alc; (ii) NaNH₂ in liq. NH₃

\(\Lambda_m^\circ\) for NaCl, HCl and NaA are 126.4, 425.9 and 100.5 S cm² mol⁻¹, respectively. If the conductivity of 0.001 M HA is 5 \(\times\) 10⁻⁵ S cm⁻¹, degree of dissociation of HA is -

The element that shows greater ability to form p\(\pi\)-p\(\pi\) multiple bonds, is :

The major product of the following reaction is –

(the optically active tertiary chloride \(\mathrm{CH_3-C(Cl)(CH_2CH_3)-COOCH_2CH_3}\) is heated with \(\mathrm{NaOEt}\))

If \(K_{sp}\) of \(\mathrm{Ag_2CO_3}\) is \(8\times10^{-12}\), the molar solubility of \(\mathrm{Ag_2CO_3}\) in 0.1 M \(\mathrm{AgNO_3}\) is -

For a reaction consider the plot of \(\ell n\,k\) versus \(1/T\) given in the figure. If the rate constant of this reaction at 400 K is \(10^{-5}\ \mathrm{s^{-1}}\), then the rate constant at 500 K is –

(The plot of \(\ell n\,k\) against \(1/T\) is a straight line with slope \(= -4606\ \mathrm{K}\).)

8 g of NaOH is dissolved in 18 g of \(\mathrm{H_2O}\). Mole fraction of NaOH in solution and molality (in mol kg\(^{-1}\)) of the solution respectively are -

The increasing order of the reactivity of the following with \(\mathrm{LiAlH_4}\) is

(A) \(\mathrm{C_2H_5CONH_2}\) (amide); (B) \(\mathrm{C_2H_5COOCH_3}\) (ester); (C) \(\mathrm{C_2H_5COCl}\) (acid chloride); (D) \(\mathrm{(C_2H_5CO)_2O}\) (anhydride)

The correct statement (s) among I to III with respect to potassium ions that are abundant within the cell fluid is /are
I. They activate many enzymes
II. They participate in the oxidation of glucose to produce ATP
III. Along with sodium ions they are responsible for the transmission of nerve signals

Given
(i) C (graphite) + \(\mathrm{O_2(g)} \to \mathrm{CO_2(g)}\); \(\Delta_rH^{\ominus} = x\ \mathrm{kJ\ mol^{-1}}\)
(ii) C (graphite) + \(\frac{1}{2}\mathrm{O_2(g)} \to \mathrm{CO(g)}\); \(\Delta_rH^{\ominus} = y\ \mathrm{kJ\ mol^{-1}}\)
(iii) CO(g) + \(\frac{1}{2}\mathrm{O_2(g)} \to \mathrm{CO_2(g)}\); \(\Delta_rH^{\ominus} = z\ \mathrm{kJ\ mol^{-1}}\)
Based on the above thermochemical equations, find out which one of the following algebraic relationships is correct?

The major product of the following reaction is –

(cyclopent-3-en-1-one treated with \(\mathrm{NaBH_4}\) in EtOH)

The aldehydes which will not form Grignard product with one equivalent Grignard reagents are -

(A) benzaldehyde; (B) 4-HO₂C-C₆H₄-CHO; (C) 4-H₃CO-C₆H₄-CHO; (D) 4-HOH₂C-C₆H₄-CHO

The major product in the following conversion is –

(4-methoxyphenyl)-CH=CH-CH₃ treated with HBr (excess), heat, gives ?

If the de Broglie wavelength of the electron in \(n^{th}\) Bohr orbit in a hydrogenic atom is equal to \(1.5\pi a_0\) (\(a_0\) is Bohr radius), then the value of \(n/z\) is -

In a Frank-Hertz experiment, an electron of energy 5.6 eV passes through mercury vapour and emerges with an energy 0.7 eV. The minimum wavelength of photons emitted by mercury atoms is close to :

Formation of real image using a biconvex lens is shown below :

If the whole set up is immersed in water without disturbing the object and the screen positions, what will one observe on the screen ?

The element that does NOT show catenation is :

To double the covering range of a TV transmission tower, its height should be multiplied by :

A paramagnetic material has \(10^{28}\) atoms/m\(^3\). Its magnetic susceptibility at temperature 350 K is \(2.8 \times 10^{-4}\). Its susceptibility at 300 K is :

A particle of mass 20 g is released with an initial velocity 5 m/s along the curve from the point A, as shown in the figure. The point A is at height h from point B. The particle slides along the frictionless surface. When the particle reaches point B, its angular momentum about O will be :
(Take g = 10 m/s²)