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
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Total rounds: 12
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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 is named . What molecular formula and molar mass are consistent with the name? Use , , , and .

a) ,

b) ,

c) ,

d) ,

2 / 50

2. A condensed formula is written as . How many carbon atoms are present?

3 / 50

3. An extraction problem uses . A aqueous solution containing solute is extracted first with ether and then with another ether. What percentage of solute is extracted in total?

4 / 50

4. A name-to-formula check is made for . What molecular formula and molar mass are consistent with the name? Use , , , and .

a) ,

b) ,

c) ,

d) ,

5 / 50

5. Match each condensed formula with its functional-group family.

Formula	Family
P.	1. carboxylic acid
Q.	2. haloalkane
R.	3. alcohol
S.	4. aldehyde

a) P-2, Q-3, R-4, S-1

b) P-3, Q-2, R-1, S-4

c) P-2, Q-4, R-3, S-1

d) P-1, Q-3, R-4, S-2

6 / 50

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

a) amide group

b) ether group

c) nitrile group

d) nitro group

7 / 50

7. A compound contains the group at the end of a carbon chain. The group is not the same as because:

a) aldehyde group versus carboxyl group

b) contains only carbon and hydrogen

c) has no carbon atom

d) must always be an ether group

8 / 50

8. Free radicals are generally formed when:

a) a bond breaks heterolytically only

b) a nucleophile accepts a proton only

c) a bond breaks homolytically

d) resonance structures exchange atoms

9 / 50

9. In the name , why is written before even though its locant is larger?

a) The larger locant must always be written first

b) Carboxylic acids cannot have prefixes

c) alphabetical prefix order: bromo before nitro

d) Nitro groups are never written in names

10 / 50

10. The classification “acyclic” and “cyclic” mainly depends on whether:

a) the compound has a high boiling point

b) the compound contains oxygen

c) the compound is soluble in water

d) open chain or ring skeleton

11 / 50

11. A ketone named is checked for formula and carbonyl position. Which option is correct?

a) , alcohol group at carbon

b) , carbonyl carbon absent

c) , carbonyl carbon at carbon

d) , carbonyl carbon at carbon

12 / 50

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

a) ketone group with between carbon groups

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

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

d) It contains an aldehyde group because it has

13 / 50

13. In , carbon completes its octet by:

a) sharing four electron pairs with four hydrogen atoms

b) losing four electrons completely to hydrogen atoms

c) forming a double bond with each hydrogen atom

d) gaining four electrons completely from hydrogen atoms

14 / 50

14. Phosphorus in an organic compound may be oxidised and precipitated as ammonium phosphomolybdate, . This type of estimation is mainly:

a) chromatographic, because spots move on paper

b) sublimation-based, because phosphorus vapour is collected

c) volumetric, because nitrogen gas volume is measured

d) gravimetric; precipitate is weighed

15 / 50

15. For a sample, the measured element masses are carbon, hydrogen, chlorine, and nitrogen, with the remaining mass due to oxygen. What is the empirical formula of the compound?

16 / 50

16. In a tetrahedral representation, two bonds are shown as ordinary lines, one as a solid wedge, and one as a dashed wedge. The purpose of using all three styles is mainly to show:

a) different atomic masses attached to carbon

b) spatial directions of bonds around carbon

c) different elements hidden at the four bond ends

d) different charges on all four bonds

17 / 50

17. A sequence converts to , and then to . The two reaction types in order are:

a) elimination, then addition

b) rearrangement, then elimination

c) addition, then substitution

d) substitution, then addition

18 / 50

18. A compound gives the following analysis: , , and . Its molar mass is . What molecular formula is most consistent?

19 / 50

19. A hydrocarbon is open-chain and contains carbon atoms. When its formula is compared with , it has fewer hydrogen atoms. The most reasonable bonding feature is:

a) only single bonds

b) one benzene ring

c) one bond

d) one bond

20 / 50

20. During purification by sublimation, the suitable condition is that:

a) the impurity must react chemically with the main compound

b) the compound must be insoluble in every solvent

c) solid-vapour-solid change of one component

d) both components must be liquids with identical boiling points

21 / 50

21. The structure is named as:

22 / 50

22. 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) carbon can never carry any formal charge

c) oxygen better bears negative charge

d) oxygen has lower electronegativity than carbon

23 / 50

23. A compound has molecular formula , molar mass , and contains either or . Which pair can represent functional group isomerism? Use , , and .

a) and

b) and

c) and

d) and

24 / 50

24. The condensed formula is best interpreted as:

a) a molecule made of free , , and ions

b) a compound containing no carbon-carbon bond

c) a compound with oxygen inserted between two carbon atoms

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

25 / 50

25. A compound containing only carbon and hydrogen gives of and of from sample. What empirical formula is obtained?

26 / 50

26. A carbocation intermediate changes from a less stable structure to a more stable structure by migration of a neighbouring group. This step is best described as:

a) rearrangement

b) addition of

c) electrophilic substitution on benzene

d) homolytic fission

27 / 50

27. Study the table and identify the unsuitable name-structure pairing.

Structure	Proposed name
P.
Q.
R.
S.

a) S

b) Q

c) R

d) P

28 / 50

28. Consider the following statements about nitrogen-containing functional groups.
Statement I: attached to an alkyl group gives an amine.
Statement II: gives an amide.
Statement III: gives a nitro compound.
Which statements are valid?

a) I and II only

b) I, II, and III

c) II and III only

d) I and III only

29 / 50

29. A beginner says, “Every compound containing carbon must be treated in the same way as methane or ethanol.” The best correction is:

a) Methane and ethanol are not carbon compounds

b) Bonding and structure matter in carbon compounds

c) Carbon compounds are never organic

d) Only compounds obtained from plants contain carbon

30 / 50

30. For a monosubstituted cycloalkane such as , why is the locant usually unnecessary?

a) The prefix means five carbon atoms

b) one substituent is automatically at carbon

c) Chlorine cannot be attached to a ring carbon

d) The ring has no carbon atoms to number

31 / 50

31. A compound has the name . Which statement about the name is correct?

a) It has a carbon-carbon double bond at carbon

b) five-carbon parent and three methyl groups

c) It has three ethyl groups attached to pentane

d) It has only five carbon atoms in the whole molecule

32 / 50

32. Assertion: is stronger than .
Reason: The group withdraws electron density and stabilises the carboxylate ion more than .

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

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

c) Assertion is true, but Reason is false

d) Assertion is false, but Reason is true

33 / 50

33. Study the following name-structure pairs.

Structure	Proposed name
P.
Q.
R.
S.

Which row contains the unsuitable proposed name?

a) Q

b) S

c) P

d) R

34 / 50

34. A compound is known to contain exactly one functional group and has the molecular formula . Two possible structures are and . What is the best comparison?

a) Both are carboxylic acids because both contain

b) The first is an ether, while the second is an aldehyde

c) Both are alcohols because both contain oxygen

d) The first is an alcohol, while the second is an ether

35 / 50

35. A compound contains , , , and the rest oxygen. Which empirical formula is obtained?

36 / 50

36. A neutral molecule can act as an electrophile when it contains:

a) only unpaired electrons and no empty orbital

b) electron-deficient electron-pair acceptor

c) only a negative charge on carbon

d) no polar bond and no vacant orbital

37 / 50

37. A carboxylic acid homologous series contains , , and . What remains common in these members?

a) exact molar mass

b) carboxyl group

c) exact boiling point

d) number of carbon atoms

38 / 50

38. 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) keto-enol tautomerism

b) metamerism of ethers

c) chain isomerism of alkanes

d) geometrical isomerism of alkenes

39 / 50

39. A compound contains . What is the most suitable functional-group class?

a) alcohol

b) ether

c) nitrile

d) acyl halide

40 / 50

40. For , the total number of -bonds and -bonds is:

a) -bonds and -bonds

b) -bonds and -bond

c) -bonds and -bonds

d) -bonds and -bond

41 / 50

41. An alkane has molar mass . It has structural isomers due to different carbon skeletons. What is its molecular formula? Use the open-chain alkane relation and , .

42 / 50

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

a) ,

b) ,

c) ,

d) ,

43 / 50

43. A aqueous solution contains of an organic solute. The distribution coefficient . It is extracted once with ether. How much solute remains in the water layer?

44 / 50

44. A formula is assigned to ethers only. One possible ether has a carbon distribution across oxygen, and another has a distribution. What is the molar mass, and what type of isomerism is possible between such ethers? Use , , and .

a) , optical isomerism only

b) , chain isomerism only

c) , geometrical isomerism

d) , metamerism

45 / 50

45. In a separating funnel containing ether and water, the organic layer is not always the upper layer. The layer position must be decided mainly from:

a) molecular formula of water only

b) whether the solute is acidic or neutral only

c) density of the two solvents

d) colour of the solute only

46 / 50

46. A five-carbon alkane can be represented by the following carbon skeleton descriptions:

Skeleton	Description
P	Five carbon atoms in one straight chain
Q	Four-carbon chain with one methyl branch
R	Three-carbon chain with two methyl branches on the middle carbon

What is the best conclusion?

a) chain isomers of

b) only P is an organic compound

c) Q and R are position isomers of an alcohol

d) P, Q, and R are different molecular formulas

47 / 50

47. In bond-line structures, heteroatoms such as oxygen, nitrogen, and halogens are usually:

a) omitted in the same way as carbon atoms

b) shown explicitly by their symbols

c) always replaced by carbon vertices

d) written only in the molecular formula and never in the structure

48 / 50

48. For the skeleton , assume all carbon-carbon bonds are single and the compound is open-chain. How many hydrogen atoms are needed to satisfy tetravalency?

49 / 50

49. A structure contains a benzene ring with one group attached to it. At this level, the carbon skeleton is best described as:

a) alicyclic without any aromatic character

b) open-chain saturated only

c) aromatic

d) straight-chain hydrocarbon

50 / 50

50. Study the distillation choices below.

Mixture or sample	Suggested method
P. Liquid with non-volatile impurity	simple distillation
Q. Two miscible liquids with close boiling points	fractional distillation
R. Sublimable solid mixed with non-sublimable impurity	sublimation
S. Two miscible liquids with close boiling points	simple distillation only

Which row contains the unsuitable suggestion?

a) S

b) P

c) Q

d) R

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Organic Chemistry Mock Test – Class 11 Chemistry

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