Which of the following are the two main classes of hydrocarbons based on structure?

• Saturated and unsaturated

• Open-chain and closed-chain

• Aliphatic and aromatic

• Alkenes and alkynes

What is the distinguishing feature of unsaturated hydrocarbons?

• Presence of only sigma bonds

• Presence of double or triple bonds

• Presence of benzene rings

• Presence of alkyl groups

Which of the following compounds are considered saturated hydrocarbons?

• Alkenes

• Alkynes

• Alkanes

• Aromatics

Which bonds are characteristic of unsaturated hydrocarbons?

• Sigma bonds

• Pi bonds

• Delta bonds

• Covalent bonds

Which types of hydrocarbons are generally inert towards HCl and H2SO4 at room temperature?

1. Unsaturated hydrocarbons

2. Alkenes

3. Saturated hydrocarbons

4. Aromatics

Baeyer's test is used for detecting the presence of:

1. Aromatics

2. Alkanes

3. Saturated hydrocarbons

4. Unsaturated hydrocarbons

What happens to the purple color of a permanganate solution when it reacts with unsaturated hydrocarbons?

1. Turns green

2. Turns brown

3. Remains purple

4. Decolorizes

Which type of hydrocarbons reacts by substitution under rigorous conditions?

1. Alkenes

2. Alkynes

3. Aromatics

4. Alkanes

What are the characteristic reactions of unsaturated hydrocarbons?

1. Substitution reactions

2. Addition reactions

3. Elimination reactions

4. Rearrangement reactions

What kinds of bonds are found in saturated hydrocarbons?

1. Pi bonds

2. Delta bonds

3. Sigma bonds

4. Covalent bonds

Which of the following is not a characteristic reaction of unsaturated hydrocarbons?

1. Addition

2. Substitution

3. Decolorization

4. Polymerization

Which hydrocarbon class is characterized by the presence of benzene rings?

1. Alkenes

2. Alkynes

3. Aromatics

4. Alkanes

What is the product of Baeyer's test when unsaturated hydrocarbons react with permanganate solution?

1. MnO2

2. MnO

3. MnO4-

4. Mn2O7

What type of hydrocarbons are alkenes and alkynes?

1. Saturated

2. Unsaturated

3. Aromatic

4. Aliphatic

Which reaction type involves the breaking of the pi bond in unsaturated hydrocarbons?

1. Addition

2. Substitution

3. Elimination

4. Isomerization

What type of bonds contributes to the conjugative stability in aromatic compounds?

1. Sigma bonds

2. Pi bonds

3. Delta bonds

4. Covalent bonds

Which type of reactions do aromatic compounds primarily undergo?

1. Electrophilic aromatic substitution

2. Nucleophilic addition

3. Radical substitution

4. Electrophilic addition

In aromatic substitution reactions, what property of the ring system is preserved?

1. Double bonds

2. Triple bonds

3. Conjugation

4. Resonance

What is the mechanism involved in the aromatic substitution of an electrophile?

1. Single step

2. Three steps

3. Two steps

4. Four steps

Which type of reactions do aromatic compounds resist due to the risk of destroying the ring system?

1. Electrophilic substitution

2. Nucleophilic addition

3. Radical substitution

4. Electrophilic addition

In the bromination of acetanilide, which position does the substitution preferably occur due to steric inhibition?

1. Meta

2. Ortho

3. Para

4. None of the above

What type of director is the amide group in the benzene ring of acetanilide during bromination?

1. Deactivating, ortho-para director

2. Activating, meta director

3. Deactivating, meta director

4. Activating, ortho-para director

What type of substitution does the bromination of acetanilide illustrate?

1. Nucleophilic substitution

2. Electrophilic substitution

3. Radical substitution

4. Addition substitution

What is the purpose of the ignition test described in the procedure?

1. To determine the density of hydrocarbons

2. To observe the color change of hydrocarbons

3. To identify the flammability of hydrocarbons

4. To measure the boiling point of hydrocarbons

During the ignition test, if a flame produced by a hydrocarbon is luminous, what does it indicate?

1. High purity of the hydrocarbon

2. Presence of impurities in the hydrocarbon

3. High volatility of the hydrocarbon

4. Low volatility of the hydrocarbon

What is the purpose of placing a dry evaporating dish over the flame during the ignition test?

1. To extinguish the flame

2. To trap any gases released during combustion

3. To observe the color of the flame

4. To collect soot formed during combustion

Which of the following hydrocarbons is used in place of benzene during the ignition test?

1. Ethanol

2. n-Hexane

3. Acetylene

4. Toluene

What is the purpose of repeating the ignition test with different hydrocarbons?

1. To compare the flammability of different hydrocarbons

2. To test the efficacy of different ignition sources

3. To observe the effect of temperature on combustion

4. To measure the heat of combustion of hydrocarbons

What is the purpose of adding NaOH to KMnO4 solution in Baeyer's Test for Unsaturation?

1. To neutralize the solution

2. To make the solution acidic

3. To make the solution alkaline

4. To increase the reactivity of KMnO4

What is the purpose of setting aside 1 mL of the prepared KMnO4 solution as standard in Baeyer's Test?

1. To compare the color formed in each test tube

2. To serve as a control sample

3. To adjust the pH of the solution

4. To measure the concentration of KMnO4

In Baeyer's Test, what color indicates a positive result for unsaturation when compared with the standard?

1. Blue

2. Purple

3. Yellow

4. Brown

What precaution is advised while performing Baeyer's Test?

1. Avoid adding NaOH to KMnO4

2. Perform the test under strong heat and light

3. Perform the test in a hood

4. Avoid comparing the color immediately

In the Electrophilic Aromatic Substitution, what is the role of glacial acetic acid?

1. Solvent

2. Catalyst

3. Reagent

4. Reducing agent

How much bromine in acetic acid solution is added in the Electrophilic Aromatic Substitution using acetanilide?

1. 15 mL

2. 0.67 mL

3. 0.76 mL

4. 2.5 mL

What is the purpose of stirring the solution for 3 minutes more in the Electrophilic Aromatic Substitution?

1. To cool down the solution

2. To accelerate the reaction

3. To evaporate excess solvent

4. To separate the precipitate

In the Electrophilic Aromatic Substitution, what indicates a positive result when using acetanilide?

1. Formation of a yellow precipitate

2. Formation of a brown precipitate

3. Solution turning cloudy

4. Formation of a clear solution

What compound is used instead of acetanilide in the repeated steps a-c of Electrophilic Aromatic Substitution?

1. Benzene

2. Naphthalene

3. Bromine

4. Glacial acetic acid

Which step in Electrophilic Aromatic Substitution is performed using the hood?

1. Adding glacial acetic acid

2. Adding bromine in acetic acid solution

3. Stirring the solution

4. Adding distilled water