List of top Chemistry Questions on Organic Reactions asked in JEE Main

Identify A in the following reaction.

Consider the following reaction.
[The structure of a piperidine derivative reacting with $NaBH_4/MeOH$, $NaOH(aq)$, $\Delta$, $H_3O_+$]
The major product (P) formed is:}

Given below are two statements:
Statement I: Due to increase in van der Waals forces, the order of boiling points is $CH₃CH₂CH₂I>CH₃CH₂I>CH₃I$.
Statement II:

Consider the following reaction}

Statement I:} In the above reaction, product formed will be a mixture of benzyl alcohol and iodobenzene.
Statement II:} In the above reaction, the $-O-CH_2-$ bond is cleaved to give the product. Choose the correct answer.

Consider the following organic reaction sequence. Choose the final product (X) from the following (consider the major product in all intermediate reactions).

Given below are two statements :
Statement I : Heating benzamide with bromine in an ethanolic solution of sodium hydroxide will give benzylamine.
Statement II : Nitration of aniline with $HNO_3/H_2SO_4$ at 288 K produces m-nitroaniline in higher amount than o-nitroaniline (pH adjusted).
In the light of the above statements, choose the correct answer from the options given below :

Consider compounds A, B and C with following structural formulae
$A = CH_3 - CH_2 - CH_2 - CH_2 - CH_2 - OH$
$B = CH_2 = CH - CH_2 - CH_2 - CH_3$
$C = HO - CH_2 - CH_2 - CH(OH) - CH_3$
For the conversion of B from A, reagent (D) required is ____ and structural formula of product (E) obtained when C undergoes same reaction using excess reagent (D) is ____.

The following structures are:

Match the LIST-I with LIST-II

Given below are two statements:

0.2 g of an organic compound is subjected to estimation of $S$ by Carius method, giving $0.6$ g $BaSO_4$. Find \% of $S$. (Nearest integer)

Consider the reaction:

Find the number of moles of benzene formed if the efficiency of reaction is 60%.

Identify correct statement(s):
(i) $ \text{Ar–Cl} $ and $ \text{R–Cl} $ show similar chemical properties.
(ii) Rate of $ S_N^1 $ $ C_6H_5CH_2–Cl<C_6H_5–CH–C_6H_5 $
(iii) Alcohol is more polar than water, so alcoholic KOH shows elimination reaction.
(iv) Vinyl alcohol is an alkene, whereas allyl alcohol is an alkyne.
(v) Alcohol with SOC$_2$ gives alkyl halide, but phenol does not give.

What will be the mass of AgBr obtained when 1 gm of product is treated with AgNO₃ in the Carius method?

Correct statement about product X and Y

$\text{(a) They can be differentiated by NaHCO}_3 \text{ test.} $
$\text{(b) They both gives 2,4-DNP test.} \\ \text{(c) They both have same molecular mass.} \\ \text{(d) They both react with same rate with HCN.} $

Identify A and E

Statement I:

The carbocation in the structure $ \text{O}_2\text{N}\text{C} \text{H} $ is stabilized by the +R effect of the $ \text{-OCH}_3 $ group.
Statement II:

The carbocation in the structure $ \text{O}_2\text{N}\text{C} \text{H} $ is stabilized by the +R effect of the $ \text{-NO}_2 $ group.

(A) is hydrocarbon

A hydrocarbon has mass ratio of C and H in 12 : 1.
Each molecule of hydrocarbon has 2 carbon atoms.
Calculate mass of $ CO_2 $ (in gm) produced, when 3.38 gm hydrocarbon undergoes combustion.

Organic compound (X) + KOH $ \overset{H^+}{\rightarrow} $ gives product $ P $ having the same molar ratio of C : H : O. Identify product $ P $.

Write the correct order of rate of reaction of following with PhN$_2$Cl

14.0 g of calcium metal is allowed to react with excess HCl at 1.0 atm pressure and 273 K. Which of the following statements is incorrect?
$[Given: \text{Molar mass of } Ca = 40, Cl = 35.5, H = 1 \text{ g mol}^{-1}] $

For the reaction, $N_{2}O_{4} \rightleftharpoons 2NO_{2}$ graph is plotted as shown below. Identify correct statements.
A. Standard free energy change for the reaction is 5.40 kJ $mol^{-1}$.
B. As $\Delta G$ in graph is positive, $N_{2}O_{4}$ will not dissociate into $NO_{2}$ at all.
C. Reverse reaction will go to completion.
D. When 1 mole of $N_{2}O_{4}$ changes into equilibrium mixture, value of $\Delta G = -0.84 \text{ kJ mol}^{-1}$.
E. When 2 mole of $NO_{2}$ changes into equilibrium mixture, $\Delta G$ for equilibrium mixture is $-6.24 \text{ kJ mol}^{-1}$.

Choose the correct answer from the following.

Identify (A)

Consider the following carbocations: (A) $\text{CH}_3\text{C}^+\text{H}_2 \rightarrow \text{B} \rightarrow \text{CH}_3-\text{C}^+\text{H}-\text{CH}_3 \rightarrow \text{C} \rightarrow (\text{CH}_3)_3\text{C}^+$. Statement-I : B is more stable due to $9\alpha H$. Statement-II: A is less stable due to $3\alpha H$.