12th Class Chemistry Chapter 10 MCQs with Answers

Welcome to the 12th Class Chemistry Chapter 10 MCQs Online Test. We are presenting you with top MCQ questions from the 12th Class Chemistry Chapter Alkyl Halide.

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12th Class Chemistry Chapter 10 MCQs with Answers

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MCQs Class 12 Chemistry with Answers

The purpose of these online MCQs tests is to help you evaluate your 12th Class Chemistry Chapter 10 MCQs. These Multiple Choice Questions (MCQs) will prepare you for your academic success in the 12th Class Exams. 12th Class Chemistry Chapters include Chapter 1 Periodic Classification Of Elements & Periodicity, Chapter 2 S-block Elements, Chapter 3 Group lll A And Group IVA Elements, Chapter 4 Group VA And VIA Elements, Chapter 5 Halogens And Noble Gases, Chapter 6 Transition element, Chapter 7 Fundamental Principles Of Organic Chemistry, Chapter 8 Aliphatic Hydrocarbons, Chapter 9 Hydrocarbons, Chapter 10 Alkyl Halide, Chapter 11 Alcohols Phenols And Ethers, Chapter 12 Aldehydes & Ketones, Chapter 13 Carboxylic Acid, Chapter 14 Macromolecules, Chapter 15 Common Chemical Industries In Pakistan and Chapter 16 Environmental chemistry.

What is Alkyl Halide?

Alkyl halides also called haloalkanes or halogenoalkanes are chemical compounds that are often derived from alkanes that contain one or more halogens. We can also say that alkyl halides are a subset of the general class of halocarbons.

Chapter No 10 Alkyl Halide

1. Which of the following alkyl halide is the most reactive towards the attacking nucleophile choose which one is correct:

1. CH₃F
2. CH₃Cl
3. CH₃Br
4. CH₃I

2. Which of the following is not nucleophile choose which one is correct:

1. H₂O
2. H₂S
3. BF₃
4. NH₃

3. Carbocation is a/an choose which one is correct:

1. Electrophile
2. Nucleophile
3. Free radical
4. Group of atoms

4. 1-bromobutane on reaction with alcoholic potassium hydroxide gives choose which one is correct:

1. 1-butanol
2. 1-butene
3. 2-butene
4. 1-butyne

5. S_N2 reaction can be best carried out with choose which one is correct:

1. Primary alkyl halide
2. Secondary alkyl
3. Tertiary alkyl halide
4. All of above

6. For which mechanism the first step involved is the same choose which one is correct:

1. E₁ and E₂
2. E₂ and SN₂
3. SN₁ and E₂
4. E₁ and SN1

7. In the transition state of S_N2 mechanism reaction with alkhyl halides, which of the following orbital hybridization is involved choose which one is correct:

1. Sp³
2. Sp²
3. sp
4. dsp

8. Which of the following factors does not affect the S_N1 rate is choose which one is correct:

1. Nucleophilicity of the attacking nucleophile
2. Stability of the carbonium ion
3. Solvent system
4. The nature of leaving group

9. In β-elimination reaction, nucleophile attacks on choose which one is correct:

1. α-hydrogen
2. β-hydrogen
3. Hydrogen
4. α-carbon

10. The substances which donates a pair of electron to electrophile are called choose which one is correct:

1. Electrophile
2. Nucleophile
3. Lewis acid
4. Dibasic acid

11. Which one the following will be present at the position of letter B C₂H₅Br ^KOH

_Alcohol A ^H2/Pt

⎯⎯⎯→

⎯⎯⎯→ B

1. Ethyl alcohol
2. Acetaldehyde
3. Ethene
4. Ethane

12. In unimolecular reactions, the reaction completes in choose which one is correct:

1. One step
2. Two steps
3. Three steps
4. None of these

13. Grignard’s reagent reacts to form alkane with choose which one is correct:

1. Water
2. Ammonia
3. Ethanol
4. All of these

14. Grignard’s reagents produce primary alcohol with choose which one is correct:

1. Formaldehyde
2. Epoxide
3. Acetaldehyde
4. Both A. and (b)

15. Carbanions are choose which one is correct:

1. Electrophile
2. Nucleophile
3. Free radical
4. Group of atoms

16. Which substance is used to convert alcohol to alkyl halide choose which one is correct:

1. SOCl₂
2. PCl₃
3. HCl + ZnCl₂
4. All of these

17. Ethyl bromide when reduced with nascent hydrogen the product will be choose which one is correct:

1. Ethyl alcohol
2. Ethane
3. Butane
4. Propane

18. When bromomethane is hydrolyzed by aqueous NaOH solution which ion brings about the first stage of substitution choose which one is correct:

1. Na⁺
2. OH⁻
3. Anyone
4. No reaction

19. In primary alkyl halide the halogen atom is attached to a carbon which is further attached to how many carbon atoms choose which one is correct:

• One
• Two
• Three
• Nil

20. Which one of the following is not associated with S_N2 mechanism choose which one is correct:

1. 100% inversion of configuration
2. 2^nd order kinetics
3. Tertiary alkyl halides
4. Change of hybridization from sp³to sp²in transition state

21. Grignard reagent is reactive due to choose which one is correct:

1. The presence of halogen atom
2. The presence of Mg atom
3. The polarity of C − Mg bond
4. Electrophilic carbon

22. Reaction of C₂H₅MgBr with CO₂ is an example of choose which one is correct:

1. Electrophilic substitution
2. Nucleophilic substitution
3. Electrophilic addition
4. Nucleophilic addition

23. Which one of the following is not a nucleophile choose which one is correct:

1. CH₃ − NH₂
2. CH₂ = CH₂
3. OH⁻
4. CH⁺₃

24. Acetic acid can be obtained from CH₃MgI by treatment with choose which one is correct:

1. H₂O
2. ClNH₂
3. CO₂
4. HCHO