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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Organic Chemistry – Progressive Test

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1 / 50

1. A reaction description says that compounds with release more readily than comparable compounds containing only as an alcohol group. The statement mainly reflects the role of:

a) carbon chain length as the only chemical factor

b) wedge-dash notation in changing acidity

c) molecular formula in hiding all chemical behaviour

d) functional groups control characteristic reactions

2 / 50

2. Blood-red colour with in one portion of Lassaigne’s extract and a black lead acetate precipitate in another portion are best interpreted as:

a) oxygen alone is present, because lead acetate detects oxygen

b) nitrogen and sulfur; red SCN test and black test

c) chlorine alone is present, because all red colours in sodium fusion extract indicate halogen

d) fluorine is present, because fluorides give black lead precipitates

3 / 50

3. A solute has distribution coefficient . A aqueous solution is shaken once with ether. What fraction of solute is extracted into ether?

4 / 50

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

5 / 50

5. 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 alcohol, while the second is an ether

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

d) Both are alcohols because both contain oxygen

6 / 50

6. Four pairs of compounds are shown below.

Pair	Relationship claimed
P. and	Consecutive alcohol homologues
Q. and	Consecutive carboxylic acid homologues
R. and	Same homologous series
S. and	Consecutive alkane homologues

Which claim is unsuitable?

a) P

b) Q

c) R

d) S

7 / 50

7. An acid comparison is made between and . The stronger acid and the reason are:

a) , because chlorine removes the carboxyl group

b) , because withdraws electrons by

c) ; withdraws by

d) , because it has more hydrogens

8 / 50

8. The bond composition of in ethene is:

a) one -bond and two -bonds

b) one -bond and one -bond

c) two -bonds and no -bond

d) two -bonds and no -bond

9 / 50

9. Sodium fusion is used before testing nitrogen, sulfur, or halogens in an organic compound mainly because:

a) sodium removes all carbon atoms from the compound

b) water-insoluble silver salts are formed directly in the fusion tube

c) covalent elements become water-soluble sodium salts

d) organic compounds are converted completely into carbon dioxide only

10 / 50

10. An organic compound has empirical formula , but two possible molar masses are proposed: and . The corresponding molecular formulas are:

a) and

b) and

c) and

d) and

11 / 50

11. A hydrocarbon has only single bonds in an open chain. It belongs to the saturated class because:

a) it contains at least one bond

b) it contains at least one bond

c) it must contain oxygen

d) all carbon-carbon bonds are single bonds

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. The pair and is a useful first example of structural isomerism because:

a) both are the same compound written twice

b) both have different molecular formulas and the same functional group

c) both contain no oxygen

d) same formula, different atom connectivity

14 / 50

14. In a bond-line drawing, a three-carbon zig-zag chain has written at the middle carbon. The best interpretation is:

a) chlorine is omitted because hydrogens are omitted

b) chlorine is attached to the middle carbon atom

c) the structure contains no carbon atoms

d) chlorine replaces the middle carbon atom

15 / 50

15. The structure is named as:

16 / 50

16. A proposed structure for a neutral carbon compound shows one carbon atom with five single covalent bonds. What is the best judgement at this level?

a) It exceeds normal tetravalency of neutral carbon

b) It is a normal structure because carbon often has valency

c) It must be methane because methane contains five atoms

d) It is suitable only if all five bonds are bonds

17 / 50

17. The ether structures and have the same formula . What type of isomerism do they show?

a) metamerism

b) geometrical isomerism

c) position isomerism

d) chain isomerism

18 / 50

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

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

b) It has three ethyl groups attached to pentane

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

d) five-carbon parent and three methyl groups

19 / 50

19. The electronic configuration of carbon is:

20 / 50

20. A compound is checked for ester naming. The correct name is:

21 / 50

21. A compound contains a five-carbon parent chain, a double bond starting at carbon , and a methyl group at carbon . The suitable name is:

22 / 50

22. A compound contains , , and . Its molar mass is . What is its molecular formula?

23 / 50

23. A hydrocarbon decolourises bromine water. A sample reacts completely with of . Combustion of another sample gives and . What molecular formula is most consistent if one molecule adds one molecule of ?

24 / 50

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

a) linear

b) tetrahedral

c) trigonal planar

d) square planar

25 / 50

25. For the compound , how many carbon atoms are -hybridised?

26 / 50

26. A sample of an organic compound gives of dry at by the Dumas method. If the sample mass is , what is the percentage of nitrogen? Use at as .

27 / 50

27. An analytical case has carbon, hydrogen, nitrogen, and oxygen in a sample. What empirical formula follows?

28 / 50

28. A correctly measured compound has empirical formula and molar mass . What is the molecular formula?

29 / 50

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

30 / 50

30. Study the classification table.

Species	Claim
P.	electrophile
Q.	nucleophile
R.	electrophile
S.	electrophile because it is neutral

Which row contains the unsuitable claim?

a) R

b) S

c) P

d) Q

31 / 50

31. A compound contains a substituent . A second compound contains . The most suitable comparison is:

a) is alkyl; is aryl

b) both are aryl groups because both contain carbon and hydrogen

c) both are functional groups containing oxygen

d) is phenyl, while is propyl

32 / 50

32. A substituent shows effect because of electronegativity but effect because of lone-pair donation into a ring. Which group best fits this description when attached to benzene?

33 / 50

33. 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?

34 / 50

34. In the fragment , the inductive effect of chlorine is best described as:

a) hyperconjugation from a carbocation

b) effect, electron donation through -bonds

c) , electron withdrawal through -bonds

d) resonance effect through a benzene ring

35 / 50

35. A sample contains only , , and . A sample gives and . What mass of bromine is present in the sample?

36 / 50

36. Simple distillation is most suitable when:

a) volatile liquid from non-volatile impurities

b) a solid directly changes to vapour without becoming liquid

c) a coloured spot must move on an adsorbent

d) two liquids have nearly identical boiling points

37 / 50

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

a) gas absorbed in acid

b) ion

c) gas

d) in sodium extract

38 / 50

38. A reaction step is shown as . The best role assignment is:

a) is the nucleophile and is the electrophile

b) is the electrophile and is the nucleophile

c) both species are free radicals

d) both species are carbanions

39 / 50

39. In Carius estimation of halogens, the organic compound is heated with fuming and . Chlorine present in the compound is finally weighed as:

40 / 50

40. What is the molecular formula of , and why?

a) , because branching creates one double bond

b) , because only one methyl group is counted

c) ; four-chain plus two methyl carbons

d) , because the parent chain is butane

41 / 50

41. A compound is named . What molecular formula and molar mass follow from the name? Use , , , and .

a) ,

b) ,

c) ,

d) ,

42 / 50

42. A tetrahedral carbon is drawn once with wedge-dash notation and once as a simple displayed formula. Both drawings show the same atoms connected in the same order. The main difference between the drawings is:

a) number of covalent bonds

b) spatial information

c) molecular formula

d) number of carbon atoms

43 / 50

43. A compound has a longest continuous carbon chain of carbon atoms and contains only single bonds in that chain. The root and primary suffix should be:

a) and

b) and

c) and

d) and

44 / 50

44. A systematic name is preferred over a common name mainly because it:

a) removes the need to know functional groups

b) always makes the molecule heavier

c) unambiguous structural communication

d) changes covalent compounds into ionic compounds

45 / 50

45. A Kjeldahl experiment uses of monoprotic acid to absorb the ammonia evolved from an organic compound. The unused acid requires of for neutralisation. What mass of nitrogen was present in the sample?

46 / 50

46. The IUPAC name indicates:

a) butane chain with methyl at carbons 2 and 3

b) a hexane parent chain with no branches

c) a butene chain with a double bond at carbon

d) two butane molecules joined by a methyl group

47 / 50

47. A monovalent hydrocarbon group has carbon atoms and is derived from an alkane. Its formula and possible group name are:

a) , propyl

b) , propenyl only

c) , propane

d) , propyl

48 / 50

48. Assertion: Resonance stabilisation generally lowers the energy of a species.
Reason: Electron delocalisation can spread charge or -electron density over a larger part of the molecule or ion.

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

b) Assertion is false, but Reason is true

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

d) Assertion is true, but Reason is false

49 / 50

49. Study the table and identify the unsuitable entry.

Group	Source	Name
P.	methane after loss of one	methyl
Q.	ethane after loss of one	ethyl
R.	benzene after loss of one	phenyl
S.	benzene after loss of one	phenyl

a) S

b) Q

c) R

d) P

50 / 50

50. A structure is written as . What is the correct parent chain length for IUPAC naming?

a) carbon atoms

b) carbon atoms

c) carbon atoms

d) carbon atoms

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Organic Chemistry Mock Test – Class 11 Chemistry

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