Chemistry 9th Chap 13 : Topic 4 - Maryam Publications

Chemistry Chapter 13 : Topic 4

Homologous Series Formulae

1 / 15

Which statement best explains a homologous series?

A) A group of compounds that cannot be represented by a general formula

B) A group of compounds having same structural formula but different chemical properties

C) A group of compounds having same molecular mass but different functional groups

D) A group of compounds with same functional group and similar chemical properties, differing by CH₂ unit

2 / 15

What is the general formula of alkanes?

A) Cₙ Hₙ

B) Cₙ H₂ₙ₋₂

C) Cₙ H₂ₙ

D) Cₙ H₂ₙ₊₂

3 / 15

Which homologous series follows the general formula Cₙ H₂ₙ?

A) Alkanes

B) Alcohols

C) Alkynes

D) Alkenes

4 / 15

What is the general formula of alkynes?

A) Cₙ H₂ₙ

B) Cₙ H₂ₙ₋₂

C) Cₙ Hₙ₊₂

D) Cₙ H₂ₙ₊₂

5 / 15

Which statement correctly describes homologous series behavior?

A) All members have identical chemical properties and molecular mass

B) Both physical and chemical properties are completely different

C) Chemical properties are similar but physical properties change gradually

D) Physical properties remain completely identical

6 / 15

Which functional group is present in alcohols?

A) - COOH

B) - CO-

C) - OH

D) - CHO

7 / 15

What is the general formula of alcohols?

A) CₙH₂ₙ₊₁OH

B) CₙH₂ₙ

C) CₙH₂ₙ₋₁

D) CₙH₂ₙ₊₁

8 / 15

Which general formula represents carboxylic acids?

A) CₙH₂ₙ₊₁ COOH

B) CₙH₂ₙ₊ₙ

C) CₙH₂ₙ₊₁ OH

D) CₙH₂ₙ₊₁ OOH

9 / 15

What is common between successive members of a homologous series?

A) Same molecular formula

B) Difference of COOH group

C) Same physical state

D) Difference of CH₂ group

10 / 15

Which of the following is NOT a homologous series?

A) Alkanes

B) Mixture of hydrocarbons without functional group

C) Alkenes

D) Alcohols

11 / 15

Consider the following statements:
I. Alkanes are saturated hydrocarbons
II. Alkenes contain double bonds
III. Alkynes follow CₙH₂ₙ₊₂ formula
Which is correct?

A) II and III only

B) All I, II, III

C) I and II only

D) I and III only

12 / 15

Which compound belongs to alkenes?

A) C₂H₂

B) CH₄

C) C₂H₆

D) C₂H₈

13 / 15

What is the main reason homologous series show gradual change in physical properties?

A) Change in functional group

B) Change in valency

C) Increase in molecular mass by CH₂

D) Change in chemical bonding type

14 / 15

Which formula represents methane, ethane, propane in general form?

A) CₙH₂ₙ

B) CₙH₂ₙ₋₂

C) CₙHₙ

D) CₙH₂ₙ₊₂

15 / 15

What is the functional group of alkynes?

A) Carboxyl group

B) Hydroxyl group

C) Double bond

D) Triple bond

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