Exam-Style Mock Test | 11 Chemistry: Organic Chemistry

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Quiz: Organic Chemistry – Progressive Test
Total questions: 583
Questions in this round: 50
Time allotted: 70 minutes
Pass score: 60%
Total rounds: 12
Current round: 1^st
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Quiz: Organic Chemistry – Certificate Challenge
Total questions: 583
Questions to attempt: 100 random
Time allotted: 100 minutes
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Progressive Test — Guest First Round

Organic Chemistry – Progressive Test

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1 / 50

1. An alkene adds to form a bromoalkane . A sample of forms of . If one mole of adds one mole of , what is the formula of ? Use .

2 / 50

2. Using the data carbon, hydrogen, and bromine from a compound containing only , , and , what empirical formula is obtained? Use .

3 / 50

3. The species , , and are grouped together because they are:

a) nucleophiles

b) electrophiles

c) free radicals

d) carbanions

4 / 50

4. A mixture contains and common salt. The most suitable purification method for separating is:

a) chromatography only

b) simple distillation

c) sublimation

d) steam distillation

5 / 50

5. A mixture of ethanol and propanone contains oxygen in total. What mass of ethanol is present in the mixture? Use , , and .

6 / 50

6. Electrophilic substitution in an aromatic compound differs from electrophilic addition to an alkene because the aromatic reaction:

a) cannot involve an electrophile

b) always destroys the benzene ring completely

c) always removes from the ring

d) ring H replacement with aromaticity retained

7 / 50

7. A substituted ring has the name . What molecular formula and molar mass are expected? Use and .

a) ,

b) ,

c) ,

d) ,

8 / 50

8. A skeletal formula contains five carbon vertices or ends in total and exactly one double bond, with no ring and no heteroatom. What molecular formula should it have?

9 / 50

9. A tetrahedral carbon is attached to four different groups: , , , and . Why can a wedge-dash drawing be more informative than a simple condensed formula?

a) it shows groups toward or away from the viewer

b) it converts all single bonds into double bonds

c) it removes the need to know carbon valency

d) it changes the molecular formula of the compound

10 / 50

10. The reaction under light is best classified as:

a) substitution reaction

b) elimination reaction

c) keto-enol tautomerism

d) addition reaction

11 / 50

11. The pair below is described without drawing full structures:
Case 1: a carbonyl-containing form with
Case 2: a related form with and
What relationship is most likely being described?

a) chain isomerism of alkanes

b) keto-enol tautomerism

c) geometrical isomerism of alkenes

d) metamerism of ethers

12 / 50

12. A haloalkane is converted completely into the alcohol . A sample of the haloalkane gives alcohol. What is ? Use and .

13 / 50

13. A molecule has two labelled carbon atoms. Carbon P is in a group, while carbon Q is in a group. The better comparison is:

a) both P and Q are

b) P is and Q is

c) both P and Q are

d) P is and Q is

14 / 50

14. Assertion: can behave as an electrophile even though it is neutral.
Reason: The boron atom in has an incomplete octet and can accept an electron pair.

a) Assertion is false, but Reason is true

b) Assertion is true, but Reason is false

c) Both Assertion and Reason are true, but Reason does not explain Assertion

d) Both Assertion and Reason are true, and Reason explains Assertion

15 / 50

15. Match the bond drawing convention with its usual spatial meaning.

Drawing convention	Spatial meaning
P. Solid wedge	1. Bond behind the plane
Q. Dashed wedge	2. Bond toward the viewer
R. Plain line	3. Bond in the plane of the paper

a) P-2, Q-3, R-1

b) P-1, Q-2, R-3

c) P-3, Q-1, R-2

d) P-2, Q-1, R-3

16 / 50

16. A carbon atom changes from having four single bonds to being part of a carbon-carbon double bond. The most likely change in local geometry around that carbon is:

a) linear to square planar

b) trigonal planar to tetrahedral

c) linear to tetrahedral

d) tetrahedral to trigonal planar

17 / 50

17. In thin-layer chromatography, a component travels from the baseline, while the solvent front travels . What is the value of the component?

18 / 50

18. A compound contains only , , , and . Analysis gives , , and . What is the correct way to find oxygen percentage?

b) only

19 / 50

19. An organic compound containing only , , , and gives and from of sample. In a Dumas estimation, of the compound gives of dry at . If the molar mass is , what is the molecular formula?

20 / 50

20. In the Dumas method for nitrogen estimation, nitrogen present in an organic compound is finally measured mainly as:

a) in sodium extract

b) gas

c) ion

d) gas absorbed in acid

21 / 50

21. A condensed formula is written as . What structural feature is most clearly shown?

a) two carbon atoms joined directly by a bond

b) a carbon-carbon double bond

c) an oxygen atom between two groups

d) a terminal group

22 / 50

22. The bond breaks so that gets one electron and gets one electron. The products are best classified as:

a) resonance structures

b) carbocation and carbanion

c) electrophile and nucleophile only

d) free radicals

23 / 50

23. A proposed pair of resonance structures changes the position of an oxygen atom from one carbon to another. What is the best judgement?

a) The pair represents an inductive effect through -bonds

b) The pair is valid because resonance always moves atoms

c) invalid; atom positions must remain fixed

d) The pair is valid only if the molecular formula changes

24 / 50

24. For a mixture of ethanol and propanone , the total oxygen mass is . What mass of ethanol is present?

25 / 50

25. Two compounds have the same carbon skeleton , but one is and the other is . Their difference in characteristic reactions is mainly due to:

a) change in the number of carbon atoms

b) conversion of the carbon chain into a benzene ring

c) disappearance of all covalent bonds

d) different functional groups on the same skeleton

26 / 50

26. Read the case below and answer the question.

A student writes the name for a compound with a pentane chain, chlorine at carbon , and nitro at carbon . The structure is correct, but the written order of prefixes is questioned.

What is the best corrected name?

27 / 50

27. A resonance contributor places a negative charge on oxygen, while another contributor places the same negative charge on carbon. If both have similar octet completion, the contributor with negative charge on oxygen is usually more important because:

a) resonance forms are chosen by molecular mass only

b) oxygen better bears negative charge

c) carbon can never carry any formal charge

d) oxygen has lower electronegativity than carbon

28 / 50

28. A rearrangement reaction is most suitably described as a reaction in which:

a) a molecule only gains across a double bond

b) internal atom or group migration

c) one atom is replaced by another without any internal change

d) every bond breaks homolytically to form radicals only

29 / 50

29. A species , , and are compared. Which statement is correct?

a) contains a lone pair on carbon

b) cation deficient; anion rich; radical unpaired

c) is a free radical because it has a negative sign

d) all three species have the same charge

30 / 50

30. A molecule written as is included in the opening study of organic chemistry mainly because it shows carbon bonded to hydrogen by covalent bonds. What is the compound?

a) Carbon dioxide

b) Calcium carbide

c) Methane

d) Sodium carbonate

31 / 50

31. In the compound , the hydrocarbon part and the functional group are best separated as:

a) hydrocarbon part , functional group

b) hydrocarbon part , functional group

c) hydrocarbon part , functional group

d) hydrocarbon part , functional group

32 / 50

32. An elemental-analysis dataset gives carbon, hydrogen, nitrogen, and oxygen in a compound sample. If the molar mass is , what molecular formula follows?

33 / 50

33. In skeletal notation, a central vertex is connected by single lines to three terminal ends. No heteroatom symbols are shown. What carbon skeleton is represented?

a) a two-carbon chain with two oxygen atoms

b) a three-carbon ring

c) a straight four-carbon chain only

d) a branched four-carbon skeleton

34 / 50

34. A group attached to an organic skeleton strongly withdraws electron density. In electronic-effect language, it is mainly:

a) a group with no effect on electron density

b) a group that always donates electrons through -bonds

c) an electron-donating alkyl group

d) an electron-withdrawing group

35 / 50

35. Methanol , ethanol , and propanol are placed in the same homologous series mainly because they:

a) have no covalent bonds involving oxygen

b) have exactly the same molecular formula

c) contain the same number of carbon atoms

d) same , differ by

36 / 50

36. A drawing of shows four bonds as plain lines around carbon in a flat cross. The chemically better interpretation is:

a) a 2D tetrahedral representation

b) methane contains two -bonds

c) carbon has only two bonds in methane

d) methane is actually square planar

37 / 50

37. A compound belongs to the alcohol homologous series and has molar mass . Assume it is a saturated monohydric alcohol with formula . Identify its molecular formula using , , and .

38 / 50

38. In Carius estimation of sulfur, sulfur in the organic compound is finally converted into and weighed as:

39 / 50

39. Read the case below and answer the question.

A formula is first written as . Then it is drawn as a four-carbon zig-zag bond-line structure. In the drawing, no carbon symbols and no hydrogens attached to carbon are written.

What is the best interpretation of the drawing?

a) It represents only, with no hydrogen atoms

b) It is incomplete because every carbon and hydrogen must be written

c) It must contain four oxygen atoms because four symbols are omitted

d) a valid skeletal formula with implied carbon hydrogens

40 / 50

40. A compound has the name . What molecular formula and molar mass are consistent with the name? Use and .

a) ,

b) ,

c) ,

d) ,

41 / 50

41. A saturated open-chain hydrocarbon has molar mass . It forms three different carbon skeletons without changing its molecular formula. Identify the formula and the type of isomerism involved. Use , .

a) , chain isomerism

b) , position isomerism

c) , geometrical isomerism

d) , functional group isomerism

42 / 50

42. Study the following name-structure pairs.

Structure	Proposed name
P.
Q.
R.
S.

Which row contains the unsuitable proposed name?

a) Q

b) P

c) S

d) R

43 / 50

43. Blood-red colour with in Lassaigne’s extract is most consistent with the presence of:

a) oxygen only forming oxide

b) chlorine only forming chloride

c) phosphorus forming phosphate

d) nitrogen and sulfur form thiocyanate

44 / 50

44. A molecule contains one phenyl group and one ethyl group joined by a single bond, written as . What is the molecular formula and molar mass? Use and .

a) ,

b) ,

c) ,

d) ,

45 / 50

45. A organic compound containing sulfur gives of in Carius estimation. What is the percentage of sulfur? Use , , and .

46 / 50

46. A molecule has a carbon chain and a terminal group . What is the most suitable family classification?

a) aldehyde

b) alcohol

c) ether

d) carboxylic acid

47 / 50

47. A carbon atom is attached to two oxygen atoms in , but it still has valency . This is because:

a) valency is always equal to the number of atoms attached

b) oxygen does not form covalent bonds with carbon

c) carbon becomes divalent whenever oxygen is present

d) each double bond counts as two valencies

48 / 50

48. A disubstituted cyclohexane has bromo and methyl groups on adjacent ring carbons. Which name best follows numbering and alphabetical prefix order?

49 / 50

49. A ring has six carbon atoms and one bond inside the ring. With no substituent present, the suitable name is:

50 / 50

50. A set of formulas is given below:

Formula	Basic interpretation
P.	One-carbon hydrocarbon
Q.	Two-carbon hydrocarbon
R.	Carbon compound containing oxygen
S.	Carbon compound

Which entry is not a suitable organic-chemistry foundation interpretation?

a) P

b) R

c) S

d) Q

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Organic Chemistry Mock Test – Class 11 Chemistry

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Organic Chemistry – Progressive Test

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