JEE Main 2019 (Online) 10th April Evening Slot

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

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 increasing order of nucleophilicity of the following nucleophiles is :
(a) CH3CO2\(-\)           (b) H2O
(c) CH3SO3\(-\)           (d) \(\mathop O\limits^ - H\)

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

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

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

For the reaction,
2SO2(g) + O2(g) = 2SO3(g), \(\Delta\)H = –57.2 kJ mol–1
and KC = 1.7 × 1016
Which of the following statement is incorrect ?

For the reaction of H2 with I2, the rate constant is 2.5 × 10–4 dm3
mol–1s–1
at 327°C and 1.0 dm3
mol–1
at
527°C. The activation energy for the reaction, in kJ mole–1
is : (R = 8.314 JK–1
mol–1
)

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

The crystal field stabilization energy (CFSE) of [Fe(H2O)6]Cl2 and K2[NiCl4] respectively, are :

The correct order of the first ionization enthalpies is :

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

The INCORRECT statement is :

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

Air pollution that occurs in sunlight is :

Points I, II and III in the following plot respectively correspond to (Vmp : most probable velocity)

The major product obtained in the given reaction is :

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

The correct statements among (a) to (d) are :
(a) saline hydrides produce H2 gas when reacted with H2O.
(b) reaction of LiAlH4 with BF3 leads to B2H6.
(c) PH3 and CH4 are electron - rich and electron - precise hydrides, respectively.
(d) HF...

The pH of a 0.02 M NH4Cl solution will be :
[given Kb (NH4OH) = 10–5
and log 2 = 0.301]

The correct statement is :

The noble gas that does not occur in the atmosphere is :

The number of pentagons in C60 and trigons (triangles) in white phosphorus, respectively, are :

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



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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 :

1 g of a non-volatile non-electrolyte solute is dissolved in 100 g of two different solvents A and B whose
ebullioscopic constants are in the ratio of 1 : 5. The ratio of the elevation in their boiling points, $${{\Delta {T_b}(A)} \over {\D...

The minimum amount of O2(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 ratio of the shortest wavelength of two spectral series of hydrogen spectrum is found to be about 9. The
spectral series are :

The correct option among the following is :

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 :