1
JEE Main 2025 (Online) 2nd April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
In Dumas' method for estimation of nitrogen, 0.5 gram of an organic compound gave 60 mL of nitrogen collected at 300 K temperature and 715 mm Hg pressure. The percentage composition of nitrogen in the compound (Aqueous tension at $300 \mathrm{~K}=15 \mathrm{~mm} \mathrm{Hg}$ ) is___________%.
A
20.87
B
12.57
C
1.257
D
18.67
2
JEE Main 2025 (Online) 2nd April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

$$ \text { Match List - I with List - II. } $$

List - I
(Purification technique)
List - II
(Mixture of organic compounds)
(A) $$
\text { Distillation (simple) }
$$
(I) Diesel + Petrol

(B) $$
\text { Fractional distillation }
$$
(II) Aniline + Water

(C) $$
\text { Distillation under reduced pressure }
$$
(III)
Chloroform + Aniline


(D) $$
\text { Steam distillation }
$$
(IV)
Glycerol + Spent-lye

$$ \text { Choose the correct answer from the options given below : } $$

A
(A)-(III), (B)-(I), (C)-(IV), (D)-(II)
B
(A)-(III), (B)-(IV), (C)-(II), (D)-(I)
C
(A)-(II), (B)-(IV), (C)-(I), (D)-(III)
D
(A)-(II), (B)-(III), (C)-(IV), (D)-(I)
3
JEE Main 2025 (Online) 23rd January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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 $\mathrm{FeSO}_4$ 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

A
Both Statement I and Statement II are false
B
Statement I is false but Statement II is true
C
Both Statement I and Statement II are true
D
Statement I is true but Statement II is false
4
JEE Main 2024 (Online) 9th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Which of the following compound can give positive iodoform test when treated with aqueous $$\mathrm{KOH}$$ solution followed by potassium hypoiodite.

A
JEE Main 2024 (Online) 9th April Evening Shift Chemistry - Practical Organic Chemistry Question 18 English Option 1
B
JEE Main 2024 (Online) 9th April Evening Shift Chemistry - Practical Organic Chemistry Question 18 English Option 2
C
JEE Main 2024 (Online) 9th April Evening Shift Chemistry - Practical Organic Chemistry Question 18 English Option 3
D
$$\mathrm{CH_3CH_2CH_2CHO}$$
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