MDCAT XII Chemistry Hydrocarbons Online Test-2

Instructions for MDCAT XII Chemistry Organic Hydrocarbons Online Test-2:

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Test Details:

Subject: Chemistry
Class: 2nd year or 12
Chapter Name: Hydrocarbons
Test: MDCAT 2025
Book: Sindh Textbook
Total No. Of MCQS: 50 MCQS
Time Allowed: 50 Minutes
Price: Free

200

Created on April 20, 2025 By

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MDCAT XII Chemistry Hydrocarbons Online Test-2

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NameEmailPhone Number

1 / 50

1. When methane and chlorine free radical are mixed during propagation step what is product.

a) CH₃Cl + HCl

b) CH₃Cl + H(atom)

c) CH₃° + H-Cl

d) CH₃°Cl + HCl

2 / 50

2. Reactivity of R-X order is RI > RBr > RCl > RF when we react RX with benzene which reacts rapidly?

a) CH₃I

b) CH₃-Br

c) CH₃-F

d) CH₃-Cl

3 / 50

3. Halogenation of methane is easier than ethane because of:

a) dichlorination at 2nd step

b) Having 6 hydrogen

c) Both A & B

d) Having 4 hydrogen

4 / 50

4. When 2 moles of HF are added separately in 2 boxes having ethyne and ethene. Which of the following react fast.

a) Ethene because exposed σ electron

b) Ethyne because exposed σ electron

c) Ethyne because it has exposed π electrons

d) Ethene because it has exposed π electrons

5 / 50

5. Which process do they differ in when performing nitration and sulphonation of benzene?

a) Attack of electrophile

b) Removal of proton

c) Attachment of proton

d) Formation of electrophile

6 / 50

6. Generally, CH₃ is an ortho-para director. When toluene reacts with RX, what are the major and minor products?

a) Ortho-para due to steric hindrance

b) Ortho-meta-para due to π density

c) Para-ortho due to steric hindrance

d) Ortho-meta

7 / 50

7. What is the product when CH₃-CH=CH₂ reacts with H-Br in presence of H₂0₂

a) 2 Bromo Propene

b) 1 Bromo Propene

c) Iso propyl bromide

d) Propyl bromide

8 / 50

8. Alkene favourite reactions are electrophilic addition. What are the favourite reactions from which alkyne is made ?

a) electrophilic addition

b) nucleophilic addition

c) elimination

d) less reactivity (produces minority)

9 / 50

9. If C₃H₄ reacts with 2 moles of HBr product is:

a) 1,1,2,2 tetra bromo ethene

b) 1,1 dibromo ethene

c) 1,2 dibromo ethene

d) Geminal dibromo ethane

10 / 50

10. Which of the following is not aromatic?

a) A

b) B

c) C

d) D

11 / 50

11. Nitration followed by oxidation of toluene generates?

a) meta nitro benzoic acid

b) para nitro benzoic acid

c) Para benzo nitro benzene

d) none of them

12 / 50

12. The reaction of ethane with hydrogen chloride is:

a) Free radical substitution

b) Free radical addition

c) Free radical transferation

d) None of these

13 / 50

13. Reduction of angle of cyclopropane is

a) 60°

b) 109.5°

c) 49.5°

d) 60.5°

14 / 50

14. Which of the following reaction generates alkene :

A) 2C₂H₅–Cl + 2Na (Wurtz reaction)

B) Cl-CH₂–CH2-Cl + 2H (dehalogenation)

C) CH₃–Cl + KOH(alcoholic) (dehydrohalogenation)

D) C₂H₂ + H2 (hydrogenation)

a) A, B, C, D

b) B, C, D

c) B, D

d) A

15 / 50

15. Percentage of (P) in butene and pKa value of ethene

a) 33, 25

b) 50, 25

c) 67, 25

d) 67, 44

16 / 50

16. Dehydrohalogenation of R-X in the presence of a polar solvent to generate:

a) Alkyne

b) Alkene

c) Alkane

d) Alkanol

17 / 50

17. Density of benzene is

a) 0.88 g/m³

b) 889 g/m³

c) 889 kg/m³

d) 889 kg/cm³

18 / 50

18.

a) Elimination

b) Substitution

c) No reaction

d) Phenol reaction to produce benzene

19 / 50

19. Which of the following is incorrect about C₆H_6?

a) sp² hybrid

b) Same bond length

c) Delocalization of 3π electrons

d) More stable

e) All are correct

20 / 50

20. Ethene and butyne can be distinguished by:

a) Electrophilic substitution (AgNO3, HCl)

b) Polymerization reaction

c) Product of hydration

d) Both are unsaturated

21 / 50

21. Identitfy :

a) Picric Acid

b) P- cresol

c) 1, 3, 5 trinitro benzene

d) Para nitro benzene

22 / 50

22. Benzene is oxidized to form benzoic acid the presence of KMnO4 then by product is product it:

a) CO2

b) CO2 and H2O

c) Benzoic Acid and CO2

d) NO reaction occurs

23 / 50

23. Choose the correct statement

a) All deactivating are meta directors

b) Halogens are ortho-para activator

c) Oxygen of ester with benzene is activator

d) Carbon of ester with benzene is activator

24 / 50

24. 3-methyl but 1-ene react with HBr to form

a) 2 bromo 3 methyl butane

b) 3 methyl 2 bromo butane

c) 2 bromo 2 methyl butane

d) 2 methyl 2 bromo butane

25 / 50

25. Three balloons each contain Fluorine Iodine and marsh gas.If I want fast reaction and more CH₃Cl, which gas I mix for fast react and more which gas is require in excess

a) F2 – F2

b) F2 – CH4

c) I2 – I2

d) I2 – CH4

26 / 50

26. According to stability which of the following is correct

a) Benzene is less stable then phenol

b) Nitro benzene is more stable then toluene

c) Phenyl ethanoate is more stable than ethyl benzoate

d) None of them

27 / 50

27. Formation of methane occurs

A) Decarboxylation of Sodium ethanoate

B) Dehydrohalogenation of CH3Cl

C) Hydrogenation of Alkene

a) A,B,C

b) A,B

c) B,C

d) A

28 / 50

28. Azhar performs the reaction in hot day at open ground between the toluene and chlorine gas the major product is

a) ortho-chloro-toluene

b) para-chloro-toluene

c) benzyl chloride

d) meta chloro toluene

29 / 50

29. If (X) is the line connecting carbon to carbon the delocalized π electron are present at

a) above the X line

b) below the X line

c) between two carbon atoms

d) above and below the (X).

30 / 50

30.

NR2 attach with benzene make it more reactive for nucleophile.
O–C=O–R attach with benzene make It more stable than benzene

a) statement (I) and (II) correct

b) statement (I) is correct while (II) incorrect

c) both incorrect

d) statement (II) correct (I) incorrect

31 / 50

31. When benzene reacts with HNO3 then product is

a) meta nitro benzene

b) ortho nitro benzene

c) para nitro benzene

d) None of them

32 / 50

32. After the alkylation of benzene, the nitration is done at room temperature the product is

a) TNT

b) meta nitro toluene

c) ortho nitro toluene

d) meta methyl nitro benzene

33 / 50

33. Benzene is soluble in

a) chloroform

b) acetone

c) ether

d) All

34 / 50

34. Find the correct statement:

a) Benzene when oxidized by KMnO4 produces carboxylic acid

b) Alkane when oxidized by KMnO4 produce carboxylic acid

c) A and B are correct

d) None of them

35 / 50

35. Hydration of ethyne in the presence of H2SO4 and Hg produce intermediate

a) acetaldehyde

b) ketone

c) vinyl alcohol

d) ethanol

36 / 50

36. Tick the following having less acidity

a) nitro benzene

b) benzoic acid

c) methoxy benzene

d) chloro benzene

37 / 50

37. The presence of σ bond is found by

a) ozonolysis of alkene

b) ozonolysis of alkane

c) ozonolysis of benzene

d) None of them

38 / 50

38. Which of the following is more reactive

a) cyclo butane

b) cyclo pentane

c) cyclo propane

d) hexane

39 / 50

39. Number of carbon in gasoline

a) C5–C9

b) C5–C10

c) C5–C8

d) C5–C7

40 / 50

40. Acylation and alkylation are performed with two separate toluene. If first toluene molecule go through acylation and second go through alkylation product is

a) ortho methyl acetophenone, ortho xylene

b) ortho methyl acetophenone, meta xylene

c) para methyl acetophenone, ortho xylene

d) para methyl acetophenone, meta xylene

41 / 50

41. Which of the following is least reactive?

a) propene

b) propyne

c) benzene

d) propane

42 / 50

42. Which of the following is not ortho para director?

a) Cl

b) NHR

c) CHO

d) OH

43 / 50

43. Benzene, 1, 4-diol is called:

a) catechol

b) Resorcinol

c) Hydroquinone

d) 1, 2, 3 trihydroxy benzene

44 / 50

44. which of the following does not give substitution Reaction?

a) C6H6

b) C2H6

c) C2H4

d) C2H2

45 / 50

45. Boiling and melting point of benzene:

a) 5.5°C, 80°C

b) 6°C, 80°C

c) 70°C, 5.5°C

d) 80°C, 5.5°C

46 / 50

46. Identify the electrophile called as acylium ion

a) R3N+

b) RCO+

c) RCOO+

d) RNO+

47 / 50

47. Ozonolysis of ethyne produce

a) 2 Formaldehyde

b) 1, 2 ethanedial

c) ethylene glycol

d) Acetone

48 / 50

48. Dehalogenation reaction is:

a) endothermic, addition

b) exothermic, elimination

c) endothermic, elimination

d) exothermic, addition

49 / 50

49. Arrange them in bond length order:

a) C2H6 > C2H4 > C6H6 > C2H2

b) C2H6 > C2H2 > C2H4 > C6H6

c) C2H6 > C6H6 > C2H4 > C2H2

d) C2H6 > C2H4 > C2H2 > C6H6

50 / 50

50. Alkane can undergo which reaction

A.Free radical addition

B.Polymerization

C.Combustion

D.Cracking

a) A, C, D

b) A, B, C, D

c) C, D

d) B, C,D

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MDCAT XII Chemistry Hydrocarbons Online Test-2

Instructions for MDCAT XII Chemistry Organic Hydrocarbons Online Test-2:

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