Practical Organic Chemistry — Page 4 | JEE Chemistry

Q31

Which of the following artificial sweeteners has the highest sweetness value in comparison to cane sugar ?

A Alitame

B Sucralose

C Saccharin

D Aspartame

Correct Answer

Option A

Solution

Sweetness value order wrt cane sugar Alitame > Sucralose > Saccharin > Aspartame Sucralose = 600 Aspartame = 100 Saccharin = 550 Alitame = 2000

Q32

A chemist has 4 samples of artificial sweetener A, B, C and D. To identify these samples, he performed certain experiments and noted the following observations : (i) A and D both form blue-violet colour with ninhydrin. (ii) Lassaigne extract of C gives positive AgNO3 test and negative Fe4[Fe(CN)6]3 test. (iii) Lassaigne extract of B and D gives positive sodium nitroprusside test Based on these observations which option is correct ?

A A : Aspartame ; B : Alitame ; C : Saccharin ; D ; Sucralose

B A : Alitame ; B : Saccharin ; C : Aspartame ; D ; Sucralose

C A : Aspartame ; B : Saccharin ; C : Sucralose ; D ; Alitame

D A : Saccharin ; B : Alitame ; C : Sucralose ; D ; Aspartame

Correct Answer

Option C

Solution

(i) A and D give positive test with ninhydrin because both have free carboxylic and amine group.

Both aspartame and alitame contains amino acids. (ii) Lassaigne extract give +ve test with AgNO3.

So Cl is present, –ve test with Fe4[Fe(CN)6]3 means N is absent.

So it can't be Aspartame or Saccharine or Alitame, so C is sucralose. (iii) Lassaigne solution of B and D given +ve sodium nitroprusside test, so it is a sulphur containing compound, Saccharine and Alitame also contains sulphur.

$\therefore$ A = Aspartame, B = Saccharin C = Sucralose, D = Alitame.

Q33

The antifertility drug “Novestrol” can react with :

A Br2 /water; ZnCl2 /HCl; FeCl3

B Br2 /water; ZnCl2 /HCl; NaOCl

C Alcoholic HCN; NaOCl; ZnCl2 /HCl

D ZnCl2 /HCl; FeCl3 ; Alcoholic HCN

Correct Answer

Option A

Solution

Ethinylestradiol (novestrol) It can reacts with Br2 /water due to presence of unsaturation, with ZnCl2 /HCl due to –OH group and with FeCl3 due to phenol.

Q34

With respect to drug-enzyme interaction, identify the wrong statement.

A Allosteric inhibitor changes the enzyme's active site

B Allosteric inhibitor competes with the enzyme's active site

C Competitive inhibitor binds to the enzyme's active site

D Non-Competitive inhibitor binds to the allosteric site

Correct Answer

Option B

Solution

Allosteric inhibitor combines at allosteric site and not the active site.

Drugs inhibit the attachment of substrate on active site of enzymes in two different ways : (i) Drugs compete with the natural substrate for their attachment on the active sites of enzymes.

Such drugs are called competitive inhibitors. (ii) Some drugs do not bind to the enzyme's active site.

These bind to a different site of enzyme which is called allosteric site.

This binding of inhibitor at allosteric site changes the shape of the active site in such a way that substrate cannot recognise it.This is also called non-competitive inhibitor.

Non-competitive inhibitor changes the active site of enzyme after binding at allosteric site.

Q35

Match with . Chemical Compound Used as

List - I		List - II
(a)	Sucralose	(i)	Synthetic detergent
(b)	Glyceryl ester of stearic acid	(ii)	Artificial sweetener
(c)	Sodium benzoate	(iii)	Antiseptic
(d)	Bithionol	(iv)	Food preservative Choose the correct match :

A (a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)

B (a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)

C (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)

D (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)

Correct Answer

Option D

Solution

(a) Sucralose $\to$ Artificial sweetener (b) Glyceryl ester of stearic acid $\to$ Synthetic detergent (c) Sodium benzoate $\to$ Food preservative (d) Bithionol $\to$ Antiseptic

Q36

Match the with (Class of Drug) (Example)

List - I		List - II
(a)	Antacid	(i)	Novestrol
(b)	Artificial sweetener	(ii)	Cimetidine
(c)	Antifertility	(iii)	Valium
(d)	Tranquilizers	(iv)	Alitame

A (a) - (ii), (b) - (iv), (c) - (i), (d) - (iii)

B (a) - (iv), (b) - (i), (c) - (ii), (d) - (iii)

C (a) - (iv), (b) - (iii), (c) - (i), (d) - (ii)

D (a) - (ii), (b) - (iv), (c) - (iii), (d) - (i)

Correct Answer

Option A

Solution

Antacid - Cimetidine Artificial Sweetener - Alitame Antifertility - Novestrol Tranquilizers - Valium

Q37

Match with : (Class of Chemicals) (Example)

List - I		List - II
(a)	Antifertility drug	(i)	Meprobamate
(b)	Antibiotic	(ii)	Alitame
(c)	Tranquilizer	(iii)	Norethindrone
(d)	Artificial Sweetener	(iv)	Salvarsan Choose the most appropriate match :

A (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)

B (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)

C (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)

D (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)

Correct Answer

Option B

Solution

(a) Antifertility drug $\to$ Norethindrone (b) Antibiotic $\to$ Salvarsan (c) Tranquilizer $\to$ Meprobamate (d) Artificial sweetener $\to$ Alitame

Q38

Green chemistry in day-to-day life is in the use of :

A Chlorine for bleaching of paper

B Large amount of water alone for washing clothes

C Tetrachloroethene for laundry

D Liquified CO2 for dry cleaning of clothes

Correct Answer

Option D

Solution

Liquified CO2 for dry cleaning of clothes is in the use of green chemistry in day-to-day life.

Chlorine gas was used earlier for bleaching paper.

Now a days, hydrogen peroxide (H2O2) with suitable catalyst are used.

Earlier solvents like tetrachloroethylene were used in dry cleaning of clothes but they pollute the ground water and are carcinogenic.

Q39

Sodium stearate CH3(CH2)16COO

-

Na+ is an anionic surfactant which forms micelles in oil. Choose the correct statement for it from the following :

A It forms spherical micelles with CH3(CH2)16 - group pointing towards the centre of sphere.

B It forms non-spherical micelles with -COO

-

group pointing outwards on the surface.

C It forms spherical micelles with CH3(CH2)16 - group pointing outwards on the surface of sphere

D It forms non-spherical micelles with CH3(CH2)16 - group pointing towards the centre.

Correct Answer

Option A

Solution

Forms spherical micelles with CH3(CH2)16 group pointing towards the centre of sphere.

Q40

Which one of the following chemical agent is not being used for dry-cleaning of clothes?

A H2O2

B CCl4

C Liquid CO2

D Cl2C = CCl2

Correct Answer

Option A

Solution

CO2, CCl4 and Cl2C = CCl2 are used as dry cleaning agents for clothes. H2O2 is used as bleaching agent in laundry.