Grade 11 Chemistry: Hydrocarbons (Set 3) Exam Quiz | Concept of Maths

Question 1

1. What is the main organic product formed when 2-bromopropane reacts with metallic sodium in dry ether (Wurtz reaction)?

Accepted Answer

B) 2,3-Dimethylbutane

Answer

C) 2-Methylpentane

Answer

D) Butane

Answer

A) n-Hexane

Question 2

2. How many distinct structural monochloro derivatives are formed upon free-radical chlorination of 2-methylbutane?

Accepted Answer

C) 4

Answer

B) 3

Answer

A) 2

Answer

D) 5

Question 3

3. Reductive ozonolysis ($O_3 / Zn, H_2O$) of an alkene gives propanone ($CH_3COCH_3$) and ethanal ($CH_3CHO$) in equimolar amounts. What is the IUPAC name of the alkene?

Accepted Answer

B) 2-Methylbut-2-ene

Answer

A) 2-Methylbut-1-ene

Answer

D) 3-Methylbut-1-ene

Answer

C) Pent-2-ene

Question 4

4. When 3-methylbut-1-ene reacts with HBr in the absence of peroxides, what is the major organic product formed?

Accepted Answer

C) 2-bromo-2-methylbutane

Answer

B) 1-bromo-3-methylbutane

Answer

A) 2-bromo-3-methylbutane

Answer

D) 2,3-dibromobutane

Question 5

5. Which of the following hydrocarbons possesses the highest acidic character?

Accepted Answer

C) Ethyne ($CH \equiv CH$)

Answer

D) Propene ($CH_3-CH=CH_2$)

Answer

B) Ethene ($CH_2=CH_2$)

Answer

A) Ethane ($CH_3-CH_3$)

Question 6

6. Reduction of but-2-yne with sodium in liquid ammonia ($Na / ext{liq. } NH_3$) selectively produces:

Accepted Answer

B) trans-but-2-ene

Answer

C) n-butane

Answer

D) but-1-ene

Answer

A) cis-but-2-ene

Question 7

7. Which of the following cyclic compounds does NOT obey Hückel's rule ($4n+2\;\pi$-electrons) for aromaticity?

Accepted Answer

C) Cyclooctatetraene

Answer

D) Tropylium cation

Answer

A) Benzene

Answer

B) Cyclopentadienyl anion

Question 8

8. During Kolbe's electrolytic decarboxylation of an aqueous sodium acetate solution, which gases are evolved at the anode?

Accepted Answer

B) $C_2H_6$ and $CO_2$

Answer

D) $C_2H_6$ and $H_2$

Answer

A) $H_2$ and $O_2$

Answer

C) $CH_4$ and $CO_2$

Question 9

9. In the nitration of benzene using a mixture of concentrated $HNO_3$ and concentrated $H_2SO_4$, what is the active electrophile?

Accepted Answer

C) $NO_2^+$

Answer

A) $NO_2^-$

Answer

B) $NO^+$

Answer

D) $HSO_4^-$

Question 10

10. Ozonolysis of one mole of benzene followed by reduction with $Zn/H_2O$ yields:

Accepted Answer

A) 3 moles of Glyoxal ($CHO-CHO$)

Answer

B) 3 moles of Formaldehyde

Answer

D) 6 moles of Carbon dioxide

Answer

C) 2 moles of Formic acid

Question 11

11. When benzene is treated with 1-chloropropane in the presence of anhydrous $AlCl_3$, the major product formed is:

Accepted Answer

B) Isopropylbenzene (Cumene)

Answer

D) Ethylbenzene

Answer

A) n-Propylbenzene

Answer

C) Chlorobenzene

Question 12

12. Which of the following substituents acts as a meta-directing and ring-deactivating group during electrophilic aromatic substitution?

Accepted Answer

C) $-NO_2$

Answer

D) $-CH_3$

Answer

A) $-OH$

Answer

B) $-NH_2$

Question 13

13. Hydration of propyne ($CH_3-C \equiv CH$) with dilute $H_2SO_4$ in the presence of $HgSO_4$ catalyst at 333 K yields:

Accepted Answer

D) Propanone

Answer

C) Propan-2-ol

Answer

A) Propanal

Answer

B) Propan-1-ol

Question 14

14. Dehydrohalogenation of 2-bromobutane with alcoholic KOH predominantly yields:

Accepted Answer

B) trans-But-2-ene

Answer

C) Butan-2-ol

Answer

D) But-2-yne

Answer

A) But-1-ene

Question 15

15. Heating n-hexane to 773 K at 10-20 atm pressure over $Cr_2O_3 / Al_2O_3$ catalyst yields:

Accepted Answer

B) Benzene

Answer

D) Propane and Propene

Answer

C) Hex-1-ene

Answer

A) Cyclohexane

Question 16

16. In the Newman projection of ethane, what is the dihedral angle ($ heta$) between C-H bonds in the most stable staggered conformation?

Accepted Answer

C) $60^\circ$

Answer

B) $45^\circ$

Answer

A) $0^\circ$

Answer

D) $120^\circ$

Question 17

17. Calcium carbide ($CaC_2$) reacts with water to produce which gas?

Accepted Answer

D) Ethyne ($C_2H_2$)

Answer

C) Ethene ($C_2H_4$)

Answer

B) Ethane ($C_2H_6$)

Answer

A) Methane ($CH_4$)

Question 18

18. Which of the following alkenes exhibits geometrical (cis-trans) isomerism?

Accepted Answer

C) But-2-ene

Answer

D) Ethene

Answer

A) Propene

Answer

B) 2-Methylpropene

Question 19

19. Reaction of an alkene with Baeyer's reagent (cold, dilute, alkaline $KMnO_4$) results in:

Accepted Answer

B) Formation of vicinal cis-diols

Answer

A) Oxidative cleavage to carboxylic acids

Answer

D) Complete oxidation to $CO_2andH_2O$

Answer

C) Formation of trans-diols

Question 20

20. What is the correct decreasing order of stability for free radicals formed during free-radical substitution of alkanes?

Accepted Answer

B) Tertiary > Secondary > Primary

Answer

C) Secondary > Tertiary > Primary

Answer

A) Primary > Secondary > Tertiary

Answer

D) Methyl > Primary > Secondary

Grade 11 : Chemistry - Hydrocarbons (Set 3) | Concept of Maths

Grade 11 : Chemistry - Hydrocarbons (Set 3) | Concept of Maths— Questions & Detailed Solutions

1. What is the main organic product formed when 2-bromopropane reacts with metallic sodium in dry ether (Wurtz reaction)?

2. How many distinct structural monochloro derivatives are formed upon free-radical chlorination of 2-methylbutane?

3. Reductive ozonolysis ($O_3 / Zn, H_2O$) of an alkene gives propanone ($CH_3COCH_3$) and ethanal ($CH_3CHO$) in equimolar amounts. What is the IUPAC name of the alkene?

4. When 3-methylbut-1-ene reacts with HBr in the absence of peroxides, what is the major organic product formed?

5. Which of the following hydrocarbons possesses the highest acidic character?

6. Reduction of but-2-yne with sodium in liquid ammonia ($Na / \text{liq. } NH_3$) selectively produces:

7. Which of the following cyclic compounds does NOT obey Hückel's rule ($4n+2\;\pi$-electrons) for aromaticity?

8. During Kolbe's electrolytic decarboxylation of an aqueous sodium acetate solution, which gases are evolved at the anode?

9. In the nitration of benzene using a mixture of concentrated $HNO_3$ and concentrated $H_2SO_4$, what is the active electrophile?

10. Ozonolysis of one mole of benzene followed by reduction with $Zn/H_2O$ yields:

11. When benzene is treated with 1-chloropropane in the presence of anhydrous $AlCl_3$, the major product formed is:

12. Which of the following substituents acts as a meta-directing and ring-deactivating group during electrophilic aromatic substitution?

13. Hydration of propyne ($CH_3-C \equiv CH$) with dilute $H_2SO_4$ in the presence of $HgSO_4$ catalyst at 333 K yields:

14. Dehydrohalogenation of 2-bromobutane with alcoholic KOH predominantly yields:

15. Heating n-hexane to 773 K at 10-20 atm pressure over $Cr_2O_3 / Al_2O_3$ catalyst yields:

16. In the Newman projection of ethane, what is the dihedral angle ($ \theta$) between C-H bonds in the most stable staggered conformation?

17. Calcium carbide ($CaC_2$) reacts with water to produce which gas?

18. Which of the following alkenes exhibits geometrical (cis-trans) isomerism?

19. Reaction of an alkene with Baeyer's reagent (cold, dilute, alkaline $KMnO_4$) results in:

20. What is the correct decreasing order of stability for free radicals formed during free-radical substitution of alkanes?

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Grade 11 : Chemistry - Hydrocarbons (Set 3) | Concept of Maths

Grade 11 : Chemistry - Hydrocarbons (Set 3) | Concept of Maths— Questions & Detailed Solutions

1. What is the main organic product formed when 2-bromopropane reacts with metallic sodium in dry ether (Wurtz reaction)?

2. How many distinct structural monochloro derivatives are formed upon free-radical chlorination of 2-methylbutane?

3. Reductive ozonolysis ($O_3 / Zn, H_2O$) of an alkene gives propanone ($CH_3COCH_3$) and ethanal ($CH_3CHO$) in equimolar amounts. What is the IUPAC name of the alkene?

4. When 3-methylbut-1-ene reacts with HBr in the absence of peroxides, what is the major organic product formed?

5. Which of the following hydrocarbons possesses the highest acidic character?

6. Reduction of but-2-yne with sodium in liquid ammonia ($Na / \text{liq. } NH_3$) selectively produces:

7. Which of the following cyclic compounds does NOT obey Hückel's rule ($4n+2\;\pi$-electrons) for aromaticity?

8. During Kolbe's electrolytic decarboxylation of an aqueous sodium acetate solution, which gases are evolved at the anode?

9. In the nitration of benzene using a mixture of concentrated $HNO_3$ and concentrated $H_2SO_4$, what is the active electrophile?

10. Ozonolysis of one mole of benzene followed by reduction with $Zn/H_2O$ yields:

11. When benzene is treated with 1-chloropropane in the presence of anhydrous $AlCl_3$, the major product formed is:

12. Which of the following substituents acts as a meta-directing and ring-deactivating group during electrophilic aromatic substitution?

13. Hydration of propyne ($CH_3-C \equiv CH$) with dilute $H_2SO_4$ in the presence of $HgSO_4$ catalyst at 333 K yields:

14. Dehydrohalogenation of 2-bromobutane with alcoholic KOH predominantly yields:

15. Heating n-hexane to 773 K at 10-20 atm pressure over $Cr_2O_3 / Al_2O_3$ catalyst yields:

16. In the Newman projection of ethane, what is the dihedral angle ($ \theta$) between C-H bonds in the most stable staggered conformation?

17. Calcium carbide ($CaC_2$) reacts with water to produce which gas?

18. Which of the following alkenes exhibits geometrical (cis-trans) isomerism?

19. Reaction of an alkene with Baeyer's reagent (cold, dilute, alkaline $KMnO_4$) results in:

20. What is the correct decreasing order of stability for free radicals formed during free-radical substitution of alkanes?

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