List of top Questions asked in JEE Main

The molar heat capacity for an ideal gas at constant pressure is 20.785 J K–1 mol–1. The change in internal energy is 5000 J upon heating it from 300 K to 500 K. The number of moles of the gas at constant volume is _____. (Nearest integer)
(Given : R = 8.314 JK-1mol-1).
At 310 K, the solubility of CaF2 in water is 2.34 ×10–3 g/100 mL. The solubility product of CaF2 is _____ × 10–8 (mol/L)3.
(Given molar mass : CaF2 = 78 g mol–1).

In the following reaction,
the % yield for reaction I is 60% and that of reaction II is 50%. The overall yield of the complete reaction is _______%. [Nearest integer].

the % yield for reaction I is 60% and that of reaction II is 50%.

Given below are two statements : Statement I : On heating with \(KHSO _4\), glycerol is dehydrated and acrolein is formed 
Statement II : Acrolein has fruity odour and can be used to test glycerol's presence Choose the correct option
 In the given reaction,
The number of chiral carbon(s)
(where Et is –C2H5)
The number of chiral carbon(s) in product A is ______.
Hex-4-ene-2-ol on treatment with PCC gives ‘A’ on reaction with sodium hypoiodite gives ‘B’, which on further heating with soda lime gives ‘C’. The compound ‘C’ is
The conversion of \(propan-1-ol\) to \(n-butylamine\) involves the sequential addition of reagents. The correct sequential order of reagents is
Oxidation of toluene to benzaldehyde can be easily carried out with which of the following reagents?

The reagent, from the following, which converts benzoic acid to benzaldehyde in one step is

Decarboxylation of all six possible forms of diaminobenzoic acid \(C_6H_3(NH_2)2COOH\) yields three products A, B and C. Three acids give a product ‘A’, two acids give a product ‘B’ and one acid gives a product ‘C’. The melting point of product ‘C’ is

Isobutyraldehyde on reaction with formaldehyde and K2CO3 gives compound ‘A’. Compound ‘A’ reacts with KCN and yields compound ‘B’, which on hydrolysis gives a stable compound ‘C’. The compound ‘C’ is

Fig. Chemical Reaction







Consider the above reaction sequence and identify the product B.

Which will have the highest enol content?

The structure of A in the given reaction is:

The structure of A in the given reaction

Major product ‘B’ of the following reaction sequence is

Match List-I with List-II


Choose the correct answer from the options given below:

 

Arrange the following in decreasing acidic strength.
decreasing acidic strength.
During the denaturation of proteins, which of these structures will remain intact ?
The structure shown below is of which well-known drug molecule?
drug molecule
Which one of the following is a water soluble vitamin, that is not excreted easily?
Sugar moiety in DNA and RNA molecules, respectively are
Amongst BeF2, BF3, H2O, NH3, CCl4 and HCl, the number of molecules with non-zero net dipole moment is ______.
When sugar ‘X’ is boiled with dilute H2SO4 in alcoholic solution, two isomers ‘A’ and ‘B’ are formed. ‘A’ on oxidation with HNO3 yields saccharic acid whereas ‘B’ is laevorotatory. The compound ‘X’ is :
The formulas of A and B for the following reaction sequence are
formula for reaction

The number of molecules(s) or ions(s) from the following having non-planar structure is ____.
\(NO^-_3, H_2O_2, BF_3, PCl_3, XeF_4, SF_4, XeO_3, PH^+_4, SO3,[Al(OH)_4]^-\)