chemistry MCQs - 12th class Chapter 13 Mcqs

1

The functional group -COOH is composed of a carbonyl group and a...

A

Hydroxyl group

B

Amine group

C

Alkyl group

D

Phenyl group

2

Higher members of aliphatic monocarboxylic acids, like palmitic acid, are commonly known as...

A

Fatty acids

B

Amino acids

C

Aromatic acids

D

Dicarboxylic acids

3

The common name 'formic acid' is derived from the Latin word 'formica', which means...

A

Vinegar

B

Ant

C

Butter

D

Cheese

4

According to IUPAC nomenclature, the suffix used for carboxylic acids is...

A

-al

B

-one

C

-oic acid

D

-ol

5

Oxidizing agents like potassium dichromate in an acidic medium can convert primary alcohols into...

A

Aldehydes only

B

Ketones

C

Carboxylic acids

D

Esters

6

Preparing a carboxylic acid from an alkanenitrile (R-CN) results in a product with...

A

One less carbon atom

B

The same number of carbon atoms

C

One more carbon atom

D

Two more carbon atoms

7

Which reagent is reacted with a Grignard reagent to produce a carboxylic acid?

A

Water

B

Carbon dioxide

C

Ammonia

D

Ethanol

8

The hydrolysis of an ester like ethyl acetate with NaOH first yields...

A

A free carboxylic acid

B

An alcohol

C

A sodium salt of the acid

D

An aldehyde

9

The first three aliphatic carboxylic acids, like formic and acetic acid, have a...

A

Pungent smell

B

Fruity smell

C

Unpleasant smell

D

No smell

10

The high solubility of the first four members of carboxylic acids in water is due to...

A

Their low molecular mass

B

Van der Waals forces

C

Ionic bonding

D

Hydrogen bonding

11

In non-polar solvents like benzene, carboxylic acids exist as...

A

Monomers

B

Cyclic dimers

C

Polymers

D

Zwitter ions

12

The boiling point of ethanoic acid (acetic acid) is...

A

100°C

B

118°C

C

141°C

D

373K

13

The melting points of carboxylic acids with an even number of carbon atoms are generally higher than those with an...

A

Odd number of carbon atoms

B

Even number of carbon atoms

C

Aromatic ring

D

Double bond

14

When a carboxylic acid reacts with a base like NaOH, it forms...

A

An ester and water

B

An alcohol and water

C

A salt and water

D

An amide and water

15

The reaction of carboxylic acids with carbonates and bicarbonates produces...

A

Hydrogen gas

B

Oxygen gas

C

Sulphur dioxide

D

Carbon dioxide gas

16

The reaction of acetic acid with PCl5 produces acetyl chloride, POCl3, and...

A

H2O

B

Cl2

C

HCl

D

H2

17

The formation of an ester from a carboxylic acid and an alcohol is catalyzed by...

A

Concentrated H2SO4

B

Dilute HCl

C

Solid NaOH

D

Water

18

Esters are known for their characteristic...

A

Sour taste

B

Pungent smell

C

Fruity smell

D

Bitter taste

19

Reacting a carboxylic acid with ammonia followed by heating produces an...

A

Acid anhydride

B

Ester

C

Acid halide

D

Acid amide

20

The dehydration of carboxylic acids using a strong dehydrating agent like P2O5 forms an...

A

Acid anhydride

B

Ester

C

Ether

D

Alkene

21

Partial reduction of carboxylic acids using LiAlH4 yields...

A

Alkanes

B

Alcohols

C

Aldehydes

D

Ketones

22

Complete reduction of carboxylic acids to alkanes can be achieved using...

A

LiAlH4

B

H2/Ni

C

HI and red phosphorus

D

NaBH4

23

Pure acetic acid, which freezes into an ice-like solid at 17 °C, is called...

A

Vinegar

B

Concentrated acetic acid

C

Dilute acetic acid

D

Glacial acetic acid

24

In the commercial manufacture of acetic acid, acetylene is first converted to...

A

Ethanal

B

Ethanol

C

Ethene

D

Ethanoic acid

25

Acetic acid is used as a coagulant for latex in which industry?

A

Plastics

B

Textile

C

Rubber

D

Food

26

Organic compounds containing both an amino group and a carboxyl group are called...

A

Amides

B

Nitriles

C

Amino acids

D

Esters

27

Naturally occurring amino acids where the amino group is on the carbon atom adjacent to the carboxyl group are called...

A

α-amino acids

B

β-amino acids

C

γ-amino acids

D

δ-amino acids

28

Amino acids that the human body cannot synthesize and must be obtained from the diet are called...

A

Non-essential amino acids

B

Basic amino acids

C

Acidic amino acids

D

Essential amino acids

29

Which of the following amino acids is classified as acidic?

A

Glycine

B

Alanine

C

Lysine

D

Aspartic acid

30

The dipolar ion form of an amino acid is known as a...

A

Cation

B

Anion

C

Zwitter ion

D

Radical

31

The Zwitter ion structure of an amino acid is also referred to as an...

A

Internal salt

B

External salt

C

Acidic salt

D

Basic salt

32

When an acid is added to an amino acid, which group acts as a base?

A

The R group

B

The carboxylate ion

C

The amino group

D

The entire molecule

33

The reaction of an amino acid with an alcohol in the presence of a strong acid catalyst forms an...

A

Amide

B

Aminoester

C

Acid halide

D

Anhydride

34

The test used to visualize amino acids on a chromatogram, producing a bluish-violet product, is the...

A

Tollen's test

B

Fehling's test

C

Ninhydrin test

D

Benedict's test

35

The -CO-NH- linkage formed between two amino acids is called a...

A

Glycosidic bond

B

Ester linkage

C

Peptide bond

D

Hydrogen bond

36

A molecule formed by the condensation of two amino acids is called a...

A

Dipeptide

B

Polypeptide

C

Protein

D

Disaccharide

37

By convention, a polypeptide has a molecular mass up to...

A

1,000

B

5,000

C

10,000

D

100,000

38

A peptide with a molecular mass greater than 10,000 is called a...

A

Polypeptide

B

Protein

C

Oligopeptide

D

Enzyme

39

Propanoic acid has how many carbon atoms?

A

2

B

3

C

4

D

1

40

The common name for ethanedioic acid is...

A

Malonic acid

B

Phthalic acid

C

Oxalic acid

D

Butyric acid

41

Hydrolysis of an alkanenitrile can be carried out using...

A

Only mineral acids

B

Only alkalis

C

Either mineral acids or alkalis

D

Only water

42

The reaction of a Grignard reagent with dry ice (solid CO2) is carried out in which solvent?

A

Water

B

Ethanol

C

Ether

D

Benzene

43

Which of the following is an example of a dicarboxylic acid?

A

Acetic acid

B

Benzoic acid

C

Propanedioic acid

D

Formic acid

44

Butyric acid was named after 'butyrum', which means...

A

Ant

B

Butter

C

Vinegar

D

Milk

45

The reaction of acetic acid with active metals like Sodium (Na) produces hydrogen gas and...

A

Sodium ethoxide

B

Sodium acetate

C

Sodium formate

D

Sodium carbonate

46

The flavour of pineapple is attributed to which ester?

A

Amyl acetate

B

Ethyl butyrate

C

Octyl acetate

D

Benzyl acetate

47

To prepare acetic anhydride from acetic acid, you need to heat it with...

A

PCl5

B

SOCl2

C

NH3

D

P2O5

48

Which amino acid has a basic nature according to the provided table?

A

Proline

B

Valine

C

Lysine

D

Glutamic acid

49

In the Strecker synthesis, an amino acid is obtained from an aldehyde, HCN, and...

A

Ammonia

B

Water

C

An alcohol

D

An acid

50

The IUPAC name for Iso-Butyric acid is...

A

Butanoic acid

B

2-Methylpropanoic acid

C

Propanoic acid

D

Pentanoic acid