List of top Chemistry Questions on Organic Chemistry- Some Basic Principles and Techniques asked in JEE Main

Prolonged heating of ferrous ammonium sulphate is avoided to prevent :

Number of hydrogen atoms per molecule of a hydrocarbon A having $858 \%$ carbon is_____ (Given: Molar mass of $A =84 g mol ^{-1}$ )

The separation of two coloured substances was done by paper chromatography The distances travelled by solvent front, substance $A$ and substance $B$ from the base line are $3.25\, cm.  2.08\, cm$ and $1.05 \,cm$. respectively. The ratio of $R_f$ values of $A$ to $B$ is ________

The separation of two coloured substances was done by paper chromatography The distances travelled by solvent front, substance $A$ and substance $B$ from the base line are $3.25\, cm.  2.08 \, cm$ and $1.05\, cm$ respectively. The ratio of $R_f$ values of $A$ to $B$ is _______

In the following halogenated organic compounds the one with maximum number of chlorine atoms in its structure is :

During the detection of Lead, the Formation of which of the following compounds is not used as a confirmatory test.

The ratio of silica to alumina in cement is:

Identify the correct statement about the compound GaAIC₁₄

A solution of \(C_rO_5 \) in amyl alcohol has a _____ colour.

The number of sp² hybridized carbon atoms in the following peptide is Ala – Phe – Gly – Ala – Phe - Ley

Which of the following option contains the correct match:
(List-I) (Reactions)  (List-II) (Products)
(A) Wurtz                    (P)
(B) Fittig                     (Q) R – R
(C) Wurtz Fittig           (R)
(D) Sandmeyer            (S) 

IUPAC name of the compound C₇H₁₂O₂?

The spin only magnetic moment of the complex present in Fehling’s reagent is_____ B.M. (Nearest integer).

Correct structure of γ-methylcyclohexane carbaldehyde is

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

Assertion A: Thin layer chromatography is an adsorption chromatography. 

Reason R: A thin layer of silica gel is spread over a glass plate of suitable size inthin layer chromatography which acts as an adsorbent. 

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

The spin-only magnetic moment value of the compound with strongest oxidizing ability among MnF₄, MnF₃ and MnF₂ is____ B.M. [nearest integer]

How many of the following drugs is/are examples(s) of broad-spectrum antibiotics?
Ofloxacin, Penicillin G, Terpineol, Salvarsan.

Which technique among the following, is most appropriate in separation of a mixture of 100 mg of p-nitrophenol and picric acid?

Total number of isomers (including stereoisomers) obtained on monochlorination of methylcyclohexane is____.

The correct decreasing order of priority of functional groups in naming an organic compound as per IUPAC system of nomenclature is

The major product in the given reaction is

Match List-I with List-II

List-I(Mixture)	List-II(Purification Process)
(A) Chloroform & Aniline	(I) Steam distillation
(B) Benzoic acid & Napthalene	(II) Sublimation
(C) Water & Aniline	(III) Distillation
(D) Napthalene & Sodium chloride	(IV) Crystallisation

Choose the correct answer from the options given below:

A sample of 0.125 g of an organic compound when analysed by Duma’s method yields 22.78 mL of nitrogen gas collected over KOH solution at 280 K and 759 mm Hg. The percentage of nitrogen in the given organic compound is____.(Nearest integer) 

Given : 1. The vapour pressure of water of 280 K is 14.2 mm Hg. 

            2. R = 0.082 L atm K^–1 mol^–1