XII Chemistry Hydrocarbons Online Test Mdcat-2024

Instructions for XII Chemistry Hydrocarbons Online Test Mdcat-2024:

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NameEmailPhone Number

1 / 50

1. This Reaction takes place under ________ and high temperature and pressure

benzene + cl2 forms chlorobenzene

a) Sunlight

b) Humidity

c) Night

d) both b and c

2 / 50

2. This Reaction occurs at ____ temperature, _____ pressure, and in the presence of____. benzene to cyclohexane

a) 200°C , 300atm , Ni

b) 20°C , 30atm , Ni

c) 200 K , 300atm , Ni

d) None of these

3 / 50

3. Tick the correct statement about benznene:

i) Colorful liquid with a molecular mass of 78 g/mol.

ii) Melting point: 5.5°C.

iii) Boiling point: 80 K.

iv) Density: 0.88 g/m³.

a) All are Correct

b) only i is correct

c) Only i , ii, iii are correct

d) only ii is correct

4 / 50

4. A racemic mixture is formed by:

a) Two identical molecules with the same spatial arrangement.

b) Two different molecules with the same molecular formula.

c) Two enantiomers (mirror images) in equal proportions

d) A single molecule with a chiral center that can rotate plane-polarized light.

5 / 50

5. Which molecule is NOT capable of exhibiting optical isomerism?

a) CH3CH(OH)CH2CH3 (Butanol)

b) CH3CH2CH2CH3 (Butane)

c) H2(CH3)CH2COOH (Valine)

d) CH3CH2CHClBr (1-chloro-1-bromopropane)

6 / 50

6. Which of the following statements is true about optical isomers?

a) They have the same molecular formula but different functional groups

b) They have a mirror-image relationship and rotate plane-polarized light differently.

c) They are always found in nature as a racemic mixture.

d) none

7 / 50

7. Which of the following statements is/are true?

Functional group isomerism: This occurs when molecules have different molecular formulas and functional groups.
Chain isomerism: This occurs when molecules have the same molecular formula and the same arrangements of carbon atoms in the chain.
Positional isomerism: This occurs when molecules have the same molecular formula but the functional group is attached to different carbon atoms within the chain.
Stereoisomerism: This occurs when molecules have the same molecular formula and connectivity but differ in the spatial arrangement of atoms.

a) All are Correct

b) only 1 & 2 are Correct

c) only 3 & 4 are correct

d) all are incorrect

8 / 50

8. Tick the Correct Statement :

a) Alkanes , alkenes and alkynes are oxidized by KMnO4

b) Alkanes , alkenes are oxidized by KMnO4 but Alkynes Don’t

c) alkenes and alkynes are oxidized by KMnO4 but alkanes don’t

d) Alkanes , alkenes and alkynes are not oxidized by KMnO4

9 / 50

9. Which one of the following is a derivative of benzene is a deactivated derivative of benzene?

a) phenol

b) aniline

c) toluene

d) benzoic acid

10 / 50

10. Which one of the following pairs doesn't show function group isomers?

a) ether and alcohol

b) ether and phenol

c) aldehyde and ketone

d) ester and carboxylic acid

11 / 50

11. What is the angle of benzene?

a) 360°

b) 180°

c) 90°

d) 120°

12 / 50

12. Incorrect about para directors :

a) they release electron to the ring

b) they increase the electron density on ortho para position

c) they withdraw electron from benzene ring

d) -R , -RCO , -OR are ortho para directors

13 / 50

13. Which one of the following is used for oxidation of benzene?

a) V2O5

b) C2H5-OH

c) D2O

d) none

14 / 50

14. which of the following is the derivative of benzene which is more reactive?

a) phenol

b) benzene

c) aniline

d) Toluene

15 / 50

15. What is the boiling point of benzene?

a) 80 °C

b) 180 °C

c) 78 °C

d) all

16 / 50

16. Possible isomers of pentane:

a) 2

b) 3

c) 4

d) 5

17 / 50

17. The bond length of carbon-carbon single and double bonds in benzene is :

a) 1.20 Å, 1.54 Å

b) 1.54 Å ,1.20 Å

c) 1.39 Å , 1.39Å

d) 1.34 Å , 1.39 Å

18 / 50

18. SO3 has:

a) Electrophilic center

b) Nucleophilic center

c) Both

d) None

19 / 50

19. Benzene is less reactive and highly stable due to

a) Ring structure

b) Complete conjugation

c) Delocalized pi electrons

d) None

20 / 50

20. In sulphonation of benzene electrophile is

a) SO3H

b) SO3

c) SO3+H2SO4

d) H2SO4

21 / 50

21. In which reaction of benzene aromatic ketone is formed?

a) Alkylation of benzene

b) Acylation of benzene

c) Both

d) None

22 / 50

22. In which reaction, benzene loses its aromaticity?

a) Electrophilic substitution reaction

b) Nucleophilic substitution reaction

c) Addition reaction

d) Both A and C

23 / 50

23. Acylation of toluene gives:

a) Ortho para products

b) Meta product

c) Only ortho product

d) Only para product

24 / 50

24. In which process of free radicals substitution reaction, two free radicals are farmed

a) Chain propagation

b) Chain termination

c) Chain Initiation

d) Both A and C

25 / 50

25. What is incorrect about ethyne?

a) Shape is linear with angle of 180°

b) It's First member of Alkyne family

c) Each carbon has one sp hybrid orbital and two Unhybrid p orbitals ( py and pz

d) Statement a and c both are incorrect

26 / 50

26. Which one of the following is correct about Alkynes?

a) All Alkynes are odourless

b) All Alkynes are gases

c) Alkynes are insolube in organic solvents

d) Melting and boiling points of alkynes increase with increase in molecular mass

27 / 50

27. -COOR and -CHO are :

a) Meta Directors

b) ortho para directors

c) Both a and b

d) None is correct

28 / 50

28. The isomerism exhibited by n-propyl alcohol and isopropyl alcohol is

a) metamerism

b) position isomerism

c) functional isomerism

d) none of above

29 / 50

29. How many structural isomers does the formula C5H11OH have?

a) 5

b) 6

c) 7

d) 8

30 / 50

30. Identify the chiral molecule among the following

a) isopropyl alcohol

b) 2-pentanol

c) 1-bromo 3-butene

d) isobutyl alcohol

31 / 50

31. The molecular formula C5H12 contains how many isomeric alkanes

a) 1

b) 2

c) 3

d) 4

32 / 50

32. Which of the following does not exhibit geometric isomerism?

a) 1-hexene

b) 2-hexene

c) 3-hexene

d) 4-hexene

33 / 50

33. Alkanes undergo halogenation it is an example of

a) nucleophilic substitution

b) elimination

c) free redical substitution

d) electrophilic substitution

34 / 50

34. Which of the following is not a process of halogenation of alkanes

a) acylation

b) chlorination

c) bromination

d) iodination

35 / 50

35.

what is the total number of chain isomers possible for n-hexane?

a) 9

b) 6

c) 5

d) 4

36 / 50

36. An alkane with 6 carbon atoms will have how many hydrogen atoms?

a) 11

b) 12

c) 13

d) 14

37 / 50

37. Alkyne show _________ reactions:.

a) neither electrophilic nor nucleophilic

b) nucleophilic only

c) electrophilic only

d) both electrophilic and nucleophilic

38 / 50

38. In the ozonolysis reaction, acetylene forms

a) formaldehyde

b) glycol

c) glyoxal

d) none of above

39 / 50

39. Acetylene is oxidized by KMnO4 to form

a) oxalic acid

b) ethylene glycol

c) ethyl alcohol

d) acetic acid

40 / 50

40. To prepare alkenes from alkyl halide the process used is :

a) Substitution

b) elimination

c) hydrogenolysis

d) none of these

41 / 50

41. The most reactive halogen in the halogenation of alkanes under sunlight is

a) Cl2

b) I2

c) Br2

d) F2

42 / 50

42. The reaction of hydrogen bromide with ethylene is an example of :

a) addition

b) polymerization

c) displacement

d) substitution

43 / 50

43. Which of the following statements is true about electrophiles?

a) They are electron-rich species and donate electrons to other molecules.

b) They are electron-deficient species and accept electrons from other molecules.

c) They have a positive formal charge.

d) They are only formed from inorganic compounds.

44 / 50

44. Correct about Benzene:

i) Colorless

ii) Carcinogenic

iii) It Produces white flames on burning due to the absence of a Carbon atom in it

a) i only

b) ii only

c) i and ii only

d) iii Only

45 / 50

45. Hydrogenation 0f ethe can be carried out in the presence o

a) nickel

b) aluminium

c) zinc

d) copper

46 / 50

46. What is formed when ethene undergoes hydrohalogenation with a halogen acid (HX)?

a) Ethyl halide

b) ethanol halide

c) methanol halide

d) ethanal halide

47 / 50

47. Which rule governs the addition of halogen acid on an unsymmetrical alkene during hydrohalogenation?

a) Markovnikov’s rule

b) Saytzeff’s rule

c) Zaitsev’s rule

d) Anti-Markovnikov rule

48 / 50

48. Arenes do not undergo ___________.

a) Dehydrogenation

b) Halogenation

c) Coupling reaction

d) Cyclo additions

49 / 50

49. Identify the incorrect statement related to aromatic hydrocarbons:

a) Benzene is the simplest hydrocarbon

b) Aromatic hydrocarbon can be either mono or polycyclic

c) The aromatic hydrocarbon has a pleasant aroma (smell)

d) all are correct

50 / 50

50. Which gas is the main constituent of natural gas?

a) ethene

b) Methane

c) Ethyne

d) butane

Your score is

Instructions for XII Chemistry Hydrocarbons Online Test Mdcat-2024:

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