Chemistry 9th Chap 13 : Topic 6 - Maryam Publications

Chemistry Chapter 13 : Topic 6

Functional Groups

1 / 20

A student observes that a group of organic compounds shows similar chemical behavior even though their molecular masses gradually increase. This similarity is due to the presence of a specific part of the molecule responsible for chemical properties. What is this part called?

A) Isotope group

B) Radical ion

C) Hydrocarbon chain

D) Functional group

2 / 20

Which of the following correctly defines a functional group?

A) An atom or group of atoms responsible for chemical properties

B) A group of atoms responsible for physical state only

C) A group that determines only molecular mass

D) A group that changes only boiling point

3 / 20

Which functional group is present in alcohols?

A) - OH

B) - COOH

C) - CHO

D) - NH₂

4 / 20

A compound has the formula CH₃CHO. Its functional group is:

A) - COO-

B) - CHO

C) - OH

D) - COOH

5 / 20

Which functional group is characteristic of ketones?

A) - COOH

B) >C=O

C) - NH₂

D) - COO

6 / 20

Which compound contains a carboxylic acid functional group?

A) CH₃CHO

B) CH₃NH₂

C) CH₃COOH

D) CH₃OH

7 / 20

Phenol is different from alcohol because:

A) It has no oxygen.

B) It has no functional group.

C) - OH is attached to benzene ring.

D) It contains nitrogen.

8 / 20

Which functional group is present in amines?

A) - CHO

B) - COOH

C) - OH

D) - NH₂

9 / 20

Esters are characterized by which functional group?

A) - OH

B) - COO-

C) - NH₂

D) - COOH

10 / 20

Amides contain which functional group?

A) - CHO

B) - OH

C) - CONH₂

D) - COOH

11 / 20

Which statement best describes a homologous series?

A) Compounds with same physical state.

B) Compounds with different elements.

C) Compounds with identical functional groups and similar chemical properties.

D) Compounds with same molecular mass.

12 / 20

As we move in a homologous series, which property changes regularly?

A) Chemical nature

B) Type of atoms

C) Functional group

D) Molecular mass

13 / 20

Which pair belongs to the same homologous series?

A) CH₄ and CH₃NH₂

B) CH₃CHO and CH₃COOH

C) C₂H₅OH and CH₃OH

D) CH₃OH and CH₃COOH

14 / 20

A compound burns with a clean flame and dissolves well in water due to hydrogen bonding. Its functional group is most likely:

A) - CHO

B) - NH₂

C) - COO-

D) - COOH

15 / 20

Which functional group is responsible for the sour taste of vinegar?

A) - NH₂

B) - CHO

C) - COOH

D) - OH

16 / 20

Which of the following correctly matches compound with functional group?

A) Ammonia ⟹ - COO-

B) Methanol ⟹ - COOH

C) Ethanal ⟹ - CHO

D) Ethane ⟹ - OH

17 / 20

Why do members of a homologous series show similar chemical properties?

A) Same number of atoms

B) Same functional group

C) Same boiling point

D) Same molecular mass

18 / 20

Which functional group contains a carbonyl group but is NOT an aldehyde?

A) Amine

B) Ketone

C) Ester

D) Alcohol

19 / 20

Which statement about functional groups is correct?

A) They do not influence reactivity

B) They are always hydrocarbons

C) They determine chemical reactions of organic compounds

D) They affect only physical properties

20 / 20

Which of the following represents an ester?

A) CH₃COOCH₃

B) CH₃COOH

C) CH₃NH₂

D) CH₃CHO

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