List of top Chemistry Questions asked in JEE Main

Consider the reaction given below:

$\text{A gives positive Fehling's test. Choose the correct relation}$.

Write the correct order of rate of reaction of following compounds with $PhN_2Cl$
P: $N,N$-dimethylaniline
Q: $N,N$-dimethyl-3-methylaniline
R: $N,N$-dimethyl-2,6-dimethylaniline

5.33 gram of $CrCl_3 \cdot 6H_2O$ (1:3 electrolyte) is passed through cation exchanger. The resulting solution is then treated with an excess of $AgNO_3$, leading to formation of 8.61 gran of precipitate. Calculate :
$\frac{\text{number of moles of complex reacted}}{\text{number of moles of AgCl precipitated}} \times 100$

Most preferred site for electrophilic substitution in above example?
(Note: The molecule contains a nitrogen-containing ring and a carbonyl-containing ring, labels are U, S, R, P).

Find the correct match.

Column-I (Complex compound)	Column-II ($\Delta_0$ (CFSE) $\text{cm}^{-1}$)
(i) $[Cr(CN)_6]^{3-}$	(P) 17000
(ii) $[Cr(H_2O)_6]^{3+}$	(Q) 15000
(iii) $[Cr(en)_3]^{3+}$	(R) 12000
(iv) $[CrF_6]^{3-}$	(S) 20000

Cation of salt A when treated in flame gives apple green colour. When salt A is heated with Chromate solution gives yellow precipitate & when salt is heated with conc $HNO_3$ & Ammionium molybdate it gives canary yellow ppt. Salt A contains :

Statement-I : The correct increasing order of bond length among the following is $O_2^+ < O_2 < O_2^- < O_2^{2-}$.
Statement-II : The correct order of number of unpaired electrons is $O_2^{2-} < O_2^+ < O_2^- < O_2$.

Statement-I : The correct order of Ionization energy is $Na > Mg > Al > Ar$
Statement-II : Among the following elements $Sc, Ca$ and $Mg, Ca$ has highest $3^{rd}$ Ionisation Energy.

Statement-1 : Benzyl chloride reacts faster than ethyl chloride towards $S_N1$.
Statement-2 : Positive charge on ethyl will be unstable.

Statement-I : 1, 2, 3-trihydroxy propane can be separated from water by using simple distillation.
Statement-II : Azeotropic mixture cannot be separated by using fractional distillation.

Which of the following order is correct for priority of functional group in IUPAC nomenclature?

Match correctly with the reagents given in column-I with organic compounds given in column-II.

Column-I (Name of test)	Column-II (Pair of compounds)
(i) Neutral $FeCl_3$ test	(P) Aldehyde vs Ketone pairs
(ii) Isocyanide test $CHCl_3 + KOH/\Delta$	(Q) Phenol vs Ethanol pairs
(iii) Ammonical silver nitrate test	(R) Primary amine vs Secondary amine pairs
(iv) $NaHCO_3$ test	(S) Carboxylic acid vs Phenol pairs