List of top Chemistry Questions asked in WBJEE

Toluene reacts with mixed acid at 25°C to produce:
The correct acidity order of phenol (I), 4-hydroxybenzaldehyde (II), and 3-hydroxybenzaldehyde (III) is:
Which of the following statement(s) is/are correct?

Identify the ion having 4f\(^6\) electronic configuration.

The correct stability order of the following carbocations is : (I)H2C⨁-CH=CH-CH3, (II)⨁CH2-CH=CH-BMe2, (III)H2C⨁-CH=CH-NMe2, (IV)H2C⨁-CH=CH-OMe
The correct order of boiling points of N-ethylethanamine(I), ethoxyethane(II) and butan-2-ol(III) is
 
'L' in the above sequence of reaction is/are(where L≠M≠N)
The correct set(s) of reactions to synthesize benzoic acid starting from benzene is/are
An electron in the 5d orbital can be represented by the following(n,1,mr) values
The conversion(s) that can be carried out by bromine in carbon tetrachloride solvent is/are
Which of the following mixtures act(s) as a buffer solution?
Which statement(s) is/are applicable above critical temperature?
 
'G' in the above sequence of reaction is
Nickel combines with a uninegative monodentate ligand (X-) to form a paramagnetic complex [NiX4]2-.The hybridization involved and number of unpaired electrons present in the complex and respectively
63g of a compound (Mol.Wt.=126) was dissolved in 500g of distilled water.The density of the resultant solution is 1.126g/ml. The molarity of the solution is
Case-1: An ideal gas of molecular weight M at temperature T.
Case-2: Another ideal gas of molecular weight 2M at the temperature \(\frac{T}{2}\).
Identify the correct statement in the context of the above two cases.

The correct option for the above reaction is 

If all the nucleophilic substitution reactions at saturated carbon atoms in the above sequence of reactions follow Sn2 mechanism, then E and F will be respectively,
(i)(ii)(iii)(iv)
The correct order of acidity of above compound is 
Structure of M
Structure of M is

(i)

(ii)

(iii)

 

The relationship between the pair of compounds shown above is respectively,

(i)(ii)(iii)
The correct order of C = O bond length in ethyl propanoate(I), ethyl propenoate(II) and ethenyl propanoate(III) is
The IUPAC name of CH3CH=C-CHO-CH2-CH3 is:
Select the molecule in which all the atoms may lie on a single plane is 
The calculated spin-only magnetic moment values in BM for [FeCl4]- and [Fe(CN)6]3- are