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) Functional group

B) Hydrocarbon chain

C) Radical ion

D) Isotope 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 changes only boiling point

D) A group that determines only molecular mass

3 / 20

Which functional group is present in alcohols?

A) - OH

B) - CHO

C) - NH₂

D) - COOH

4 / 20

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

A) - CHO

B) - COOH

C) - OH

D) - COO-

5 / 20

Which functional group is characteristic of ketones?

A) - COOH

B) >C=O

C) - COO

D) - NH₂

6 / 20

Which compound contains a carboxylic acid functional group?

A) CH₃COOH

B) CH₃OH

C) CH₃CHO

D) CH₃NH₂

7 / 20

Phenol is different from alcohol because:

A) It has no functional group.

B) - OH is attached to benzene ring.

C) It contains nitrogen.

D) It has no oxygen.

8 / 20

Which functional group is present in amines?

A) - OH

B) - CHO

C) - NH₂

D) - COOH

9 / 20

Esters are characterized by which functional group?

A) - COO-

B) - NH₂

C) - COOH

D) - OH

10 / 20

Amides contain which functional group?

A) - CONH₂

B) - OH

C) - CHO

D) - COOH

11 / 20

Which statement best describes a homologous series?

A) Compounds with same molecular mass.

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

C) Compounds with different elements.

D) Compounds with same physical state.

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

A) Chemical nature

B) Functional group

C) Type of atoms

D) Molecular mass

13 / 20

Which pair belongs to the same homologous series?

A) CH₃OH and CH₃COOH

B) CH₄ and CH₃NH₂

C) CH₃CHO and CH₃COOH

D) C₂H₅OH and CH₃OH

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) - COO-

B) - CHO

C) - COOH

D) - NH₂

15 / 20

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

A) - COOH

B) - CHO

C) - OH

D) - NH₂

16 / 20

Which of the following correctly matches compound with functional group?

A) Ethane ⟹ - OH

B) Methanol ⟹ - COOH

C) Ethanal ⟹ - CHO

D) Ammonia ⟹ - COO-

17 / 20

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

A) Same functional group

B) Same number of atoms

C) Same boiling point

D) Same molecular mass

18 / 20

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

A) Ester

B) Amine

C) Ketone

D) Alcohol

19 / 20

Which statement about functional groups is correct?

A) They are always hydrocarbons

B) They determine chemical reactions of organic compounds

C) They do not influence reactivity

D) They affect only physical properties

20 / 20

Which of the following represents an ester?

A) CH₃COOH

B) CH₃CHO

C) CH₃COOCH₃

D) CH₃NH₂

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