JEE Main Test 72

Result

JEE Main Test 72

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Weekly Quiz Competition

Question 1
4 / -1

The alcohol obtained by the hydrolysis of oils and fats is

A
glycol

B
glycerol

C
propanol

D
pentanol

Solution

Hydrolysis of fats and oil carried out by strong aqueous bases to form soap along with Glyeerol is called saponification.
Question 2
4 / -1

What represents the best method producing salicylic acid?

A
Benzoic acid, strong base, high temperature

B
Toluene, strong base, water, high temperature

C
Phenol, base, carbon dioxide then acid

D
Bromobenzene, carbonic acid, high temperature

Solution

Sodium salicylate is commercially prepared by treating sodium phenolate (the sodium salt of phenol) with carbon dioxide at high pressure (100atm) and high temperature (390K), a method known as the Kolbe –schmitt reaction. Acidification of the product with Sulphuric gives salicylic acid.
Question 3
4 / -1

Reimer-Tiemann reaction involves

A
carbonium ion intermediate

B
carbene intermediate

C
carbanion intermediate

D
free radical intermediate

Solution

The Reimer – Tiemann reaction is a chemical reaction used for the ortho-formylation of phenols (conversion of phenols to salicylaldehyde ) using chloroform, a base and acid work – up. The mechanism involves the elichloro-carbene as intermediate followed by a series of steps, results in
salicylaldehyde.
Question 4
4 / -1

The correct statement about the following disaccharide is

A
Ring (A) is pyranose with α-glycosidic link

B
Ring (A) is furanose with α-glycosidic link

C
Ring (B) is furanose with α-glycosidic link

D
Ring (B) is pyranose with α-glycosidic link

Solution

In the given structures A and B ring A is 6membered ring containg one oxygen with α – glycosidic linkage, hence it is pyranose where as ring B is 5- membered ring containing one oxygen is furanos with β – glycosidic linkage.
Question 5
4 / -1

A
1

B
-2

C
√2

D
0

Solution
Question 6
4 / -1

A
31/2

B
35/2

C
47/2

D
39/2

Solution
Question 7
4 / -1

An object is placed at a distance of 40 cm in front of a concave mirror of focal length 20 cm. The nature of image is

A
real and inverted and of same size

B
virtual and erect and of same size

C
real and erect and of same size

D
virtual and inverted and of same size

Solution
Question 8
4 / -1

A
π/6

B
π/9

C
π/12

D
π/16

Solution
Question 9
4 / -1

The solution of the differential equation

A
2ye^2x = Ce^2x + 1

B
2ye^2x = Ce^2x - 1

C
ye^2x = Ce^2x + 2

D
None of these

Solution
Question 10
4 / -1

If a + b + c = 0 and |a| = 3, |b| = 5, |c| = 7, then angle between a and b is

A
π/3

B
π/6

C
π/4

D
π

Solution