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
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Total rounds: 12
Current round: 1^st
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Quiz: Organic Chemistry – Certificate Challenge
Total questions: 583
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Progressive Test — Guest First Round

Organic Chemistry – Progressive Test

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1 / 50

1. A compound has a four-carbon parent chain with at carbon and at carbon . The preferred name is:

2 / 50

2. A compound contains a benzene ring directly attached to . In functional-group recognition, the important first observation is that:

a) the oxygen atom must be omitted because the ring is aromatic

b) the ring converts into

c) the compound contains no functional group because benzene is present

d) the molecule contains a hydroxy group attached to an aromatic ring

3 / 50

3. A graph is described with rotation about a carbon-carbon bond on the horizontal axis and preservation of effective sideways overlap on the vertical axis. For a bond, the curve would drop sharply on rotation because:

a) the molecular formula changes continuously

b) hydrogen atoms change into carbon atoms during rotation

c) the -bond requires parallel sideways overlap

d) the -bond disappears at all angles

4 / 50

4. The condensed formula is best interpreted as:

a) a two-carbon compound with an group attached at the end

b) a molecule made of free , , and ions

c) a compound with oxygen inserted between two carbon atoms

d) a compound containing no carbon-carbon bond

5 / 50

5. Structural isomerism means that two compounds have:

a) different molecular formulas and the same connectivity

b) same molecular formula, different connectivity

c) identical connectivity but different sample masses

d) the same structure drawn with different ink colours

6 / 50

6. Study the comparison of nitrogen estimation methods.

Feature	Dumas method	Kjeldahl method
P. Final measured form	gas	after alkali treatment
Q. Main calculation basis	gas volume	acid neutralisation by ammonia
R. Ordinary suitability	all compounds without correction	especially nitro and azo compounds directly

Which row contains the unsuitable comparison?

a) Q

b) P

c) P and Q

d) R

7 / 50

7. In a Dumas estimation, nitrogen is collected over water. The observed gas volume is at and . Aqueous tension is . The sample mass is . What is the percentage of nitrogen? Use , and at .

8 / 50

8. A substituted acid has molar mass data and acid-strength clues as follows: Acid P is , Acid Q is , and Acid R is . Using , , , and , which option correctly combines molar mass and expected acid strength?

a) , , ; acid strength

b) , , ; acid strength

c) , , ; acid strength

d) , , ; acid strength

9 / 50

9. Three portions of a sodium fusion extract are tested.

Portion	Test performed	Observation
P	boiled with , then acidified	Prussian blue
Q	treated with sodium nitroprusside	violet colour
R	boiled with dilute , then added	yellow precipitate insoluble in

Which set of elements is indicated?

a) , , and

b) , , and

c) , , and

d) , , and

10 / 50

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

11 / 50

11. The pair and represents:

a) position isomerism

b) chain isomerism

c) metamerism

d) functional group isomerism

12 / 50

12. In , the functional group and the family are best identified as:

a) , ketone

b) , alcohol

c) , carboxylic acid

d) , aldehyde

13 / 50

13. Read the case below and answer the question.

A compound has molecular formula . It contains one carbonyl group and gives the name when the carbonyl group is terminal. Another structure with the same formula has the carbonyl carbon inside the chain.

What is the name of the second structure if it is a straight-chain ketone?

14 / 50

14. In the carboxylate ion , resonance stabilisation is important because:

a) negative charge delocalised over two oxygens

b) the group changes into a metal ion

c) all -bonds disappear

d) the carbonyl oxygen leaves the molecule

15 / 50

15. A compound has empirical formula and molar mass . What is the molecular formula?

16 / 50

16. A cleaner dataset for the same type of compound gives , , , and in a sample. The vapour density is . What is the molecular formula?

17 / 50

17. A single covalent bond in an organic molecule is normally a -bond because it is formed by:

a) head-on overlap along the internuclear axis

b) sideways overlap of parallel orbitals only

c) complete transfer of one electron from carbon

d) movement of a lone pair from one molecule to another

18 / 50

18. A compound is written as . What is the best functional-group reading?

a) It contains an ether group because oxygen is written between carbon symbols

b) It contains an aldehyde group because it has

c) It contains a carboxylic acid group because oxygen is present

d) ketone group with between carbon groups

19 / 50

19. Study the following comparison of electron displacement ideas.

Case	Description	Best term
P	Permanent polarisation through -bonds due to electronegativity	Inductive effect
Q	Temporary complete -electron shift during reagent attack	Electromeric effect
R	Delocalisation represented by canonical forms with fixed atoms	Resonance effect
S	Movement of atoms from one carbon skeleton to another	Resonance effect

Which row contains the unsuitable description?

a) R

b) P

c) S

d) Q

20 / 50

20. A compound has nitrogen by Kjeldahl analysis, carbon, and hydrogen. It contains only , , , and . If its molar mass is , what molecular formula is most consistent?

21 / 50

21. The Prussian blue colour in Lassaigne’s test for nitrogen is finally due to the formation of:

a) silver chloride

b) ferric ferrocyanide

c) lead sulfide

d) barium sulfate

22 / 50

22. In , carbon completes its octet by:

a) forming a double bond with each hydrogen atom

b) gaining four electrons completely from hydrogen atoms

c) sharing four electron pairs with four hydrogen atoms

d) losing four electrons completely to hydrogen atoms

23 / 50

23. Optical isomerism is introduced through molecules that contain a chiral carbon. A chiral carbon is usually a carbon atom attached to:

a) two double bonds

b) four different groups

c) four identical groups

d) only hydrogen atoms

24 / 50

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

a) always removes from the ring

b) cannot involve an electrophile

c) always destroys the benzene ring completely

d) ring H replacement with aromaticity retained

25 / 50

25. Use the arrangement described below: one central carbon is connected by single bonds to four surrounding hydrogen atoms, and no lone pair is shown on carbon. This arrangement represents the bonding pattern of:

26 / 50

26. In methane, the carbon atom is -hybridised. The shape around carbon is:

a) trigonal planar

b) tetrahedral

c) linear

d) square planar

27 / 50

27. In a homologous series, chemical properties are similar but physical properties change gradually. The best reason is:

a) all members have identical carbon skeletons

b) same functional group; chain length increases by

c) all members have exactly the same molecular mass

d) the functional group changes randomly from one member to the next

28 / 50

28. A formula record gives , and two possible structures are proposed: and . What conclusion follows?

a) They must be the same compound because their molecular formula is the same

b) Both contain the group

c) aldehyde and ketone functional groups, respectively

d) Both are ethers because oxygen is present

29 / 50

29. In a Dumas estimation, of nitrogen is collected over water at and . The aqueous tension at is . Which pressure should be used for dry nitrogen in gas calculations?

30 / 50

30. Study the functional-group table and identify the fully suitable row.

Formula fragment	Correct family	Key recognition feature
P.	ester	carbonyl attached to
Q.	nitro	nitrogen bonded to two oxygens
R.	nitrile	carbon-nitrogen triple-bond group
S.	amide	carbonyl attached to nitrogen

a) P

b) R

c) S

d) Q

31 / 50

31. Assertion: Every cyclic organic compound is aromatic.
Reason: Aromatic compounds contain a ring, so all rings are automatically aromatic.

a) Assertion is false, but Reason is false

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

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

d) Assertion is true, but Reason is false

32 / 50

32. A cyclic hydrocarbon has the formula , contains only single bonds, and has no side chain. What is the most suitable name?

33 / 50

33. The compound is best named as:

34 / 50

34. Match the hydrocarbon family with the main carbon-carbon bonding feature.

Family	Main feature
P. Alkane	1. Contains
Q. Alkene	2. Contains only single bonds in the carbon skeleton
R. Alkyne	3. Contains

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

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

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

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

35 / 50

35. A bond in an organic molecule permits comparatively free rotation about the bond axis. The bond is most likely:

a) a single bond

b) a triple bond

c) a bond containing only -overlap

d) a double bond

36 / 50

36. A compound is an acyclic monoalkene. of reacts with of . Another sample on combustion gives . Which formula is consistent with both results?

37 / 50

37. Study the reaction-centre table.

Case	Species or centre	Most likely role
P		electrophile
Q		nucleophile
R	carbonyl carbon in	electrophilic centre
S		electrophile because it has negative charge

Which row contains the unsuitable role?

a) Q

b) R

c) P

d) S

38 / 50

38. Homolytic bond fission is best described as breaking of a covalent bond in which:

a) one atom takes both bonding electrons

b) each bonded atom takes one electron from the shared pair

c) atoms change positions but electrons remain fixed

d) electrons are transferred only through -bonds without bond breaking

39 / 50

39. Study the comparison of purification and separation methods.

Method	Basis of separation
P. Sublimation	one solid changes directly to vapour
Q. Crystallisation	difference in solubility with temperature
R. Fractional distillation	close but different boiling points
S. Chromatography	identical movement in stationary and mobile phases

Which row contains the unsuitable basis?

a) P

b) R

c) Q

d) S

40 / 50

40. 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 .

41 / 50

41. A student performs the halogen test on sodium fusion extract without first boiling it with dilute . The extract gives a precipitate with . Why is the conclusion about halogen unsafe?

a) sodium fusion destroys all halogens before testing

b) dilute is used only to add chloride ions deliberately

c) or may interfere

d) cannot react with any halide ion

42 / 50

42. A molecule has the formula , and its structure is . What is the best functional and naming interpretation?

a) secondary amine, dimethylamine

b) It is an alcohol, named

c) It is a nitrile, named

d) It is an amide, named

43 / 50

43. 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) , geometrical isomerism

b) , position isomerism

c) , chain isomerism

d) , functional group isomerism

44 / 50

44. A compound has the group directly attached to a carbon chain. This group is best identified as:

a) nitro group

b) ether group

c) amide group

d) nitrile group

45 / 50

45. A structure offers two possible parent chains of equal length. Chain P gives one substituent, while Chain Q gives two substituents. No multiple bond or principal functional group is involved. Which parent chain should be selected?

a) Neither chain, because branched alkanes cannot be named systematically

b) Chain Q; more substituents in the tie

c) Chain P, because fewer substituents make the name shorter

d) Either chain, because equal length always gives identical names

46 / 50

46. A compound has a chain written as . In this skeleton, oxygen appears between two carbon parts. What does this show about organic compound diversity?

a) The chain cannot belong to an organic compound

b) Oxygen changes all carbon bonds into ionic bonds

c) Only carbon atoms can appear in an organic skeleton

d) heteroatoms may occur in carbon frameworks

47 / 50

47. In a second Carius estimation, of compound gives of . If the same compound contains carbon and hydrogen, what is the oxygen percentage assuming only , , , and are present? Use and .

48 / 50

48. Metamerism is shown by compounds having the same molecular formula and the same functional group, but different:

a) positions of the same group on one carbon chain only

b) numbers of carbon atoms in their molecular formulas

c) alkyl groups on either side of a polyvalent functional group

d) isotopic masses of carbon atoms only

49 / 50

49. A sample of undergoes complete substitution with to form . If of is used, what mass of ethanol is formed assuming complete conversion? Use , , , and .

50 / 50

50. A planar carbon centre has three groups arranged around it, and one of the bonds from that carbon is part of a group. The most suitable local description of that carbon is:

a) , tetrahedral

b) , linear

c) , trigonal planar

d) , linear

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Organic Chemistry Mock Test – Class 11 Chemistry

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Organic Chemistry – Progressive Test

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