JEE Main 2021 (Online) 24th February Morning Shift | Practical Organic Chemistry Question 36 | Chemistry

JEE Main 2021 (Online) 24th February Morning Shift

MCQ (Single Correct Answer)

-1

Given below are two statements :

Statement I: Colourless cupric metaborate is reduced to cuprous metaborate in a luminous flame.

Statement II : Cuprous metaborate is obtained by heating boric anhydride and copper sulphate in a non-luminous flame.

In the light of the above statements, choose the most appropriate answer from the options given below.

Statement I is true but Statement II is false

Statement I is false but Statement II is true

Both Statement I and Statement II are false

Both Statement I and Statement II are true

JEE Main 2020 (Online) 8th January Morning Slot

MCQ (Single Correct Answer)

-1

A flask contains a mixture of isohexane and 3-methylpentane. One of the liquids boils at 63^oC while the other boils at 60^oC What is the best way to separate the two liquids and which one will be distilled out first ?

fractional distillation, 3-methylpentane

simple distillation, 3-methylpentane

fractional distillation, isohexane

simple distillation, isohexane

JEE Main 2020 (Online) 7th January Evening Slot

MCQ (Single Correct Answer)

-1

A chromatography column, packed with silica gel as stationary phase, was used to separate a mixture of compounds consisting of (A) benzanilide (B) aniline and (C) acetophenone. When the column is eluted with a mixture of solvents, hexane : ethylacelate (20:80), the sequence of obtained compounds is :

(A), (B) and (C)

(B), (A) and (C)

(C), (A) and (B)

(B), (C) and (A)

JEE Main 2020 (Online) 7th January Morning Slot

MCQ (Single Correct Answer)

-1

A solution of m-chloronailimne, m-chlorophenol and m-chlorobenzoic acid in ethyal acetate was extracted initially with a saturated solution of NaHCO₃ to give fraction A. The left over organic phase was extracted with dilute NaoH solution tio give fraction B. The final organiic layer was labelled as fraction C. Fractions A,B and C, contain respectively :

m-chlorobenzoic acid, m-chloroaniline and m-chlorophenol.

m-chlorobenzoic acid, m-chlorophenol and m-chloroaniline.

m-chlorophenol, m-chlorobenzoic acid and m-chloronailine.

m-chloroaniline m-chlorobenzoic acid and m-chlorophenol.

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