List of top Chemistry Questions asked in JEE Main

It is observed that characteristic $X$-ray spectra of elements show regularity When frequency to the power " $n$ " ie $v^n$ of $X$-rays emitted is plotted against atomic number " $Z$ ", following graph is obtained

Select the correct order of electronegativity of the elements: B, C, At, S

Which of the following elements is most reactive?

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason $R$
Assertion A :

can be easily reduced using $Zn - Hg / HCl$ to

Reason R : $ Zn \cdot Hg / HCl$ is used to reduce carbonyl group to $- CH _2-$ group.

In the light of the above statements, choose the correct answer from the options given below:

Cyclohexylamine when treated with nitrous acid yields (P) On treating (P) with $PCC$ results in (Q) When $(Q)$ is heated with dil. $NaOH$ we get $(R)$ The final product $(R)$ is :

Consider the following reaction

The correct statement for product $B$ is It is

Number of isomeric compounds with molecular formula $C _9 H _{10} O$ which (i) do not dissolve in $NaOH$ (ii) do not dissolve in $HCl$ (iii) do not give orange precipitate with 2,4-DNP (iv) on hydrogenation give identical compound with molecular formula $C _9 H _{12} O$ is _________

'R formed in the following sequence of reactions is :

Product (P) and (Q) are respectively

Choose the correct option.

$CH_3 - CH_2 - CN \xrightarrow[\text{Ether}]{CH_3MgBr} A \xrightarrow{H_3O^+} B \xrightarrow[HCl]{Zn - Hg} C$ The correct structure of $C$ is

The number of molecules which gives haloform test among the following molecules is

Arrange the following in decreasing acidicstrength

The correct order of melting points of dichlorobenzenes is

Which of the following reaction is correct?

CH₃CH₂-Br $\overrightarrow{Acetone}^{NaI}$ CH₃-CH₂-I+NaBr
Which of the following statement is correct ?

Compound $( X )$ undergoes following sequence of reactions to give the Lactone $( Y )$

A compound A on reaction with X and Y produces the same major product but different by product a and b Oxidation of a gives a substance produced by ants X and Y respectively are :

An organic compound $[ A ]\left( C _4 H _{11} N \right)$, shows optical activity and gives $N _2$ gas on treatment with The structure of $A$ is :

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: Hydrolysis of an alkyl chloride is a slow reaction but in the presence of NaI, the rate of the hydrolysis increases
Reason R: $\,I ^{-}$is a good nucleophile as well as a good leaving group
In the light of the above statements, choose the correct answer from the options given below

The isomeric deuterated bromide with molecular formula $C _4 H _8 DBr$ having two chiral carbon atoms is

Which of the following statements is correct about freons?

Number of compounds giving (i) red colouration with ceric ammonium nitrate and also (ii) positive iodoform test from the following is_____

In the cumene to phenol preparation in presence of air, the intermediate is

Identify the incorrect option from the following: