List of top Questions asked in JEE Main

The technique used for purification of steam volatile water immiscible substance is:

Which of the following compound will most easily be attacked by an electrophile?

The set of meta directing functional groups from the following sets is:

Choose the polar molecule from the following:

Which reagent gives bright red ppt. With \(Ni^{2+}\) in basic medium?

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R :
Assertion A : Aryl halides cannot be prepared by replacement of hydroxyl group of phenol by halogen atom.
Reason R : Phenols react with halogen acids violently. In the light of the above statements.
Choose the most appropriate from the options given below:

Identify the reagents used for the following conversion

Statement I: So disproportionates into \(H_2S_2O_3\) and \(S_2^-\) in alkaline medium 
Statement II: \(ClO_4^-\) undergoes disproportionation in acidic medium

Quantum number for outermost electron of K-atom are given by

Identify correct statements from below:
A. The chromate ion is square planar. 
B. Dichromates are generally prepared from chromates. 
C. The green manganate ion is diamagnetic. 
D. Dark green coloured \(K_2​MnO_4\)​ disproportionates in a neutral or acidic medium to give permanganate. 
E. With increasing oxidation number of transition metal, ionic character of the oxides decreases. 
Choose the correct answer from the options given below:

Select the option with correct property -

What is the effect that occurs between lone pair and pi bond?

Match List I with List II

LIST-I	LIST-II
A. K2[Ni(CN)4]	I. sp3
B. [Ni(CO)4]	II. sp3d2
C. [Co(NH3)6]Cl3	III. dsp2
D. Na3[CoF6]	IV. d2sp3

Choose the correct answer from the options given below:

Element not showing variable oxidation state is:

The electronic configuration of Einsteinium is :(Given atomic number of Einsteinium = 99)

Which one of the following molecules has maximum dipole moment ?

The molar conductivity for electrolytes A and B are plotted against C^1/2 as shown below. Electrolytes A and B respectively are :

Which among the following aldehydes is most reactive towards nucleophilic addition reactions?

Which of the following can not act as an oxidising agent?

Which structure of protein remains intact after coagulation of egg white on boiling?

Which of The following coordination compounds has bridging carbonyl ligand?

Given below are two statement one is labeled as Assertion (A) and the other is labeled as Reason (R).
Assertion (A): CH₂ = CH – CH₂ – Cl is an example of allyl halide
Reason (R): Allyl halides are the compounds in which the halogen atom is attached to sp² hybridised carbon atom.
In the light of the two above statements, choose the most appropriate answer from the options given below

Identify product A and product B :

If one strand of a DNA has the sequence ATGCTTCA, sequence of the bases in complementary strand is:

Choose the correct statements from the following:
A. All group 16 elements form oxides of general formula \( EO_2 \) and \( EO_3 \) where \( E = S, Se, Te, \) and Po. Both the types of oxides are acidic in nature.
B. TeO\(_2\) is an oxidising agent while SO\(_2\) is reducing in nature.
C. The reducing property decreases from H\(_2\)S to H\(_2\)Te down the group.
D. The ozone molecule contains five lone pairs of electrons.
Choose the correct answer from the options given below: