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CBSE 10th Standard Science Subject Carbon and Its Compounds Chapter Case Study Questions 2021

Published on: 22/05/2021

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chapter: - Case study Questions

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Questions:

Case Study Questions

5 x 4 = 20

An organic molecule has the following structure:

(i) To which homologous series does this molecule belong?

(a) Aldehydes

(b) Ketones

(c) Alcohols

(d) Alkanes

(ii) What is the general formula of this homologous series?

(a) C_nH_2n+1OH

(b) C_nH_{2n + 2}

(c) CnH_2nO

(d) C_nH_2n+1CHO

(iii) Which is the next member of this series?

(a) C₄H₉OH

(b) C₃H₇OH

(c) C₅H₁₁OH

(d) C₆H₁₃OH

(iv) Which is the third member of this series?

(a) C₃H₇O H

(b) C₄H₉OH

(c) C₂H₅OH

(d) CH₃OH

(v) Which is the second member of this series?

(a) Ethanol

(b) Methanol

(c) Propanol

(d) Butanol

A hydrocarbon (P) has the molecular formula C₁₀H₂₂.A hydrocarbon (Q) has two carbon atoms less than (P) and belong to the same homologous series. A hydrocarbon (R) has two carbon atoms more than (P) and belong to the same homologous series.
(i) What is the molecular formula of (Q)?

(a) C₁₂H₂₆

(b) C₈H₁₆

(c) C₈H₁₈

(d) C₈H₁₄

(ii) To which homologous series do the compound (P), (Q) and (R) belong?

(a) C_nH_2n

(b) C₂H_{2n- 2}

(c) C_nH_2n+2

(d) C_nH_{2n + 1}

(iii) What is the molecular formula of (R)?

(a) C₁₂H₂₆

(b) C₁₂H₂₄

(c) C₁₂H₂₂

(d) C_l2H₂₈

(iv) Identify the correct statement about compounds (P), (Q) and (R).

(a) They have same melting and boiling points.	(b) They have same chemical properties.
(c) They have different general formula.	(d) They differ by -CH₂ unit.

(v) Compounds (P), (Q) and (R) are

(a) alkanes

(b) alkenes

(c) alkynes

(d) none of these.

The table given below shows six organic compounds A, B, C, D, E and F having different molecular formula:

Organic compound	Molecular formula
A	C7H₁₆
B	C₈H₁₆
C	C₄H₆
D	C₆H₁₀
E	C₅H₁₀
F	C₉H₂₀

(i) Which of the following compounds belong to same homologous series?

(a) E and F

(b) B and C

(c) A and B

(ii) Which of the following is the member of the same homologous series as E?

(a) D

(b) A

(c) F

(d) B

(iii) Identify the correct statements.

(a) A and F are saturated hydrocarbons while all others are unsaturated hydrocarbons.

(b) C and D belong to a homologous series having general formula C_nH_2n

(c) B and E are alkynes.

(d) All the compounds have same physical and chemical properties.

(iv) Compound B is

(a) an alkane

(b) an alkene

(c) an alkyne

(d) none of these.

(v) Compound (F) has a general formula

(a) C_nH_{2n -2}

(b) C_nH_2n

(c) C_nH_2n+4

(d) C_nH_2n+2

(i) Which of the following compounds belong to same homologous series?

(a) S and T

(b) T and U

(c) P and U

(d) P and T

(ii) The functional group of compound (R) is

(a) alcohol

(b) aldehyde

(c) ketone

(d) carboxylic acid.

(iii) Compound (T) belongs to homologous series of

(a) alkynes

(b) alkenes

(c) alkanes

(d) none of these.

(iv) Which of the 'following compounds is unsaturated hydrocarbon?

(a) S

(b) Q

(c) U

(d) R

(v) Which of the following compounds belongs to alkane series?

(a) P

(b) S

(c) T

(d) U

Study the table related to three hydrocarbons A, B, C and answer the questions that follow.

Organic compound	Molecular formula
A	C₃H₅
B	C₅H₁₀
C	C₄H₆

(i) A, Band C are classified as hydrocarbons because

(a) they contain hydrogen	(b) they contain carbon
(c) they contain both carbon and hydrogen	(d) none of these.

(ii) Which of these organic compounds is an alkyne?

(a) A

(b) B

(c) C

(d) All of these

(iii) C₅H₁₀belongs to

(a) C_nH_2n+2 series	(b) C_nH_2n series
(c) C_nH_2n-2series	(d) none of these.

(iv) Identify the incorrect statement about these three hydrocarbons.

(a) All have different general formula.	(b) A and B differ by -CH2 unit.
(c) C is an alkyne.	(d) B is an alkene.

(v) General formula for alkane is

(a) C_nH_2n

(b) C_nH_2n+2

C_nH_2n-2

(d) C_nH_n

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Answers Key:

Case Study Questions

5 x 4 = 20

(i) (c) :Alcohol (-OH).
(ii) (a): C_nH_2n+1OH is the general formula of the homologous series of alcohol.
(iii) (c)
(iv) (a)
(v) (a): Ethanol; C₂H₅OH is the second member of this series.

(i) (c) :Molecular formula of (Q) is CSH1Sas it has two carbon atoms less than (P).
(ii) (c): Compounds (P), (Q) and (R) are alkanes having general formula C_nH_2n+2.
(iii) (a): Molecular formula of (R) is C₁₂H₂₆as it has two carbon atoms more than (P)
(iv) (b): Compound (P), (Q) and (R) belong to same homologous series so they have different physical properties but similar chemical properties. They have same general formula C_nH_2n+2.They . differ by 2 carbon atoms and 4 hydrogen atoms.
(v) (a)

(i) (d): A and F are alkanes; Band E are alkenes; C and D are alkynes.
(ii) (d): B is an alkene having general formula C_nH_2n, the homologous series to which E belongs.
(iii) (a) : C and D belong to a homologous series having general formula C_nH_2n-2.Band E are alkenes. All the compounds have different physical and chemical properties.
(iv) (b): (B) is alkene.
(v) (d): (F) is an alkane.

(i) (d): (P) and (T) are alkynes.
(ii) (a): Alcohol (-OH).
(iii) (a): (T) is an alkyne having general formula of C_nH_2n-2·
(iv) (c): (U) is an alkene.
(v) (b)

(i) (c) :A, Band C are classified as hydrocarbons because these compounds are made up of carbon and hydrogen only.
(ii) (c): C is an alkyne.
(iii) (b): C₅H₁₀ is an alkene having a general formula C_nH_2n·
(iv) (b): A and B do not belong to same homologous series. A is an alkane while B is an alkene.
(v) (b)