Organic Chemistry: Some Basic Principles and Techniques

Methyl group attached to a positively charged carbon atom stabilizes the carbocation due to

[Re-NEET 2024]

Consider the given statements and select the correct option (memory based jee mains shift-2 29/01/2025)

Statement-1: In partition chromatography, a thin film of liquid acts as stationary phase

Statement-2: Paper chromatography is not a type of partition chromatography

The interaction between \(\pi\) bond and lone pair of electrons present on an adjacent atom is responsible for

[JEE Main 2024, 29 Jan (Shift 1)]

Given below are two statements :

Statement (I): Nitrogen, sulphur, halogen and phosphorus present in an organic compound are detected by Lassaigne's Test.

Statement (II) : The elements present in the compound are converted from covalent form into ionic form by fusing the compound with Magnesium in Lassaigne's test.

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

Which of the following form most stable carbocation?

Memory Based Question 29/Jan/25 Evening shift

Mixture of 1 g each of chlorobenzene, aniline and benzoic acid is dissolved in 50 mL ethyl acetate and placed in a separating funnel, 5 M NaOH ( 30 mL ) was added in the same funnel. The funnel was shaken vigorously and then kept aside. The ethyl acetate layer in the funnel contains

[JEE Main 2025, 7 Apr (Shift 2)]

Consider the given statements and select the correct option (memory based jee mains shift-2 29/01/2025)

Statement-1: In partition chromatography, a thin film of liquid acts as stationary phase

Statement-2: Paper chromatography is not a type of partition chromatography

The interaction between \(\pi\) bond and lone pair of electrons present on an adjacent atom is responsible for:

What is the correct order of stability? (memory based jee mains shift-1 28/01/2025)

\(\left(\mathrm{I}\right){\mathrm{Ph}}_{3}{\mathrm{C}}^{+}\\ \left(\mathrm{II}\right){\mathrm{Ph}}_{2}{\mathrm{CH}}^{+}\\ \left(\mathrm{III}\right)\mathrm{Cyclotropylium}\mathrm{cation}\\ \left(\mathrm{IV}\right){\mathrm{CH}}_{3}{\mathrm{CH}}_{2}\overset{+}{\mathrm{C}}{\mathrm{H}}_{2}{\mathrm{CH}}_{3}\)

Given below are two statements :
Statement (I) : In partition chromatography, stationary phase is thin film of liquid present in the inert support.
Statement (II) : In paper chromatography, the material of paper acts as a stationary phase. In the light of the above statements, choose the correct answer from the options given below :

[JEE Main 2025, 29 Jan (Shift 2)]

\(\\ \mathrm{COOH}{\mathrm{COOCH}}_{3}\\ {\mathrm{CH}}_{3}-\overset{|}{\mathrm{C}}\mathrm{H}-{\mathrm{CH}}_{2}-\overset{|}{\mathrm{C}}\mathrm{H}-{\mathrm{CH}}_{3}\)

The IUPAC name is ?

(Shift - I Memory Based JEE Mains 22/01/2025)

Given below are two statements. Select the correct option (JEE mains memory based shift-2 22/01/2025)

statement-1: Lassaigne test is used for detection of nitrogen, phosphorus, sulphur and halogens

statement-2: Lassaigne extract is made with magnesium metal

In Kjeldahl's method for estimation of nitrogen, CuSO₄ acts as

How many of the following can act as nucleophile? (memory based jee mains shift-1 29/01/2025)

\(\mathrm{Ph}-\mathrm{SH},{\mathrm{OH}}^{-},{\mathrm{CH}}_{2}={\mathrm{CH}}_{2},{\left({\mathrm{CH}}_{3}\right)}_{2}\mathrm{C}=\mathrm{N}-{\mathrm{CH}}_{3}\\ {\mathrm{H}}_{3}{\mathrm{O}}^{+},{\mathrm{CH}}_{3}{\mathrm{COCH}}_{3},{\mathrm{CH}}_{3}-\mathrm{S}-{\mathrm{CH}}_{3}\)

Correct order of acidic strength will be

(i) n-butanol

(ii) 4-nitrophenol

(iii) 2,4-dinitrophenol

(iv) phenol

(Memory Based JEE Mains 22/01/2025 ,Shift -1)

Given below are two statements:
Statement I: In Lassaigne's test, the covalent organic molecules are transformed into ionic compounds.
Statement II: The sodium fusion extract of an organic compound having N and S gives Prussian blue colour with \({\mathrm{FeSO}}_{4}\mathrm{and}{\mathrm{Na}}_{4}\left[\mathrm{Fe}{(\mathrm{CN})}_{6}\right]\)

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

[JEE Main 2025, 23 Jan (Shift 1)]

On heating, some solid substances change from solid to vapour state without passing through liquid state. The technique used for the purification of such solid substances based on the above principle is known as

[NEET 2024]

How many of the following can act as nucleophile? (memory based jee mains shift-1 29/01/2025)

\(\mathrm{Ph}-\mathrm{SH},{\mathrm{OH}}^{-},{\mathrm{CH}}_{2}={\mathrm{CH}}_{2},{\left({\mathrm{CH}}_{3}\right)}_{2}\mathrm{C}=\mathrm{N}-{\mathrm{CH}}_{3}\\ {\mathrm{H}}_{3}{\mathrm{O}}^{+},{\mathrm{CH}}_{3}{\mathrm{COCH}}_{3},{\mathrm{CH}}_{3}-\mathrm{S}-{\mathrm{CH}}_{3}\)

What is the correct order of stability? (memory based jee mains shift-1 28/01/2025)

\(\left(\mathrm{I}\right){\mathrm{Ph}}_{3}{\mathrm{C}}^{+}\\ \left(\mathrm{II}\right){\mathrm{Ph}}_{2}{\mathrm{CH}}^{+}\\ \left(\mathrm{III}\right)\mathrm{Cyclotropylium}\mathrm{cation}\\ \left(\mathrm{IV}\right){\mathrm{CH}}_{3}{\mathrm{CH}}_{2}\overset{+}{\mathrm{C}}{\mathrm{H}}_{2}{\mathrm{CH}}_{3}\)

\(\\ \mathrm{COOH}{\mathrm{COOCH}}_{3}\\ {\mathrm{CH}}_{3}-\overset{|}{\mathrm{C}}\mathrm{H}-{\mathrm{CH}}_{2}-\overset{|}{\mathrm{C}}\mathrm{H}-{\mathrm{CH}}_{3}\)

The IUPAC name is ?

(Shift - I Memory Based JEE Mains 22/01/2025)

Given below are two statements. Select the correct option (JEE mains memory based shift-2 22/01/2025)

statement-1: Lassaigne test is used for detection of nitrogen, phosphorus, sulphur and halogens

statement-2: Lassaigne extract is made with magnesium metal

The interaction between \(\pi\) bond and lone pair of electrons present on an adjacent atom is responsible for:

Statement I: Dumas method is used for estimation of "Nitrogen" in an organic compound.
Statement II: Dumas method involves the formation of ammonium sulphate by heating the organic compound with conc \({H}_{2}S{O}_{4}\)

The purification method based on the following physical transformation is :

\(\underset{(X)}{\text{ Solid }}\overset{\text{ Heat }}{\to }\underset{(X)}{\text{ Vapour }}\overset{\text{ Cool }}{\to }\underset{(X)}{\text{ Solid }}\)

[JEE Main 2025, 28 Jan (Shift 2)]

500 J of energy is transferred as heat to 0.5 mol of Argon gas at 298 K and 1.00 atm . The final temperature and the change in internal energy respectively are :
(Given : \(\mathrm{R}=8.3{\mathrm{JK}}^{-1}{\mathrm{mol}}^{-1}\))

Correct order of acidic strength will be

(i) n-butanol

(ii) 4-nitrophenol

(iii) 2,4-dinitrophenol

(iv) phenol

(Memory Based JEE Mains 22/01/2025 ,Shift -1)

Match the List-I with List-II.

Choose the correct answer from the options given below :