12th Class Chemistry Mcqs With Answers Chapter 10| 2nd Year chemistry mcqs with answers pdf

12th Class Chemistry Mcqs With Answers Chapter 1	12th Class Chemistry Mcqs With Answers Chapter 2
12th Class Chemistry Mcqs With Answers Chapter 3	12th Class Chemistry Mcqs With Answers Chapter 4
12th Class Chemistry Mcqs With Answers Chapter 5	12th Class Chemistry Mcqs With Answers Chapter 6
12th Class Chemistry Mcqs With Answers Chapter 7	12th Class Chemistry Mcqs With Answers Chapter 8
12th Class Chemistry Mcqs With Answers Chapter 9	12th Class Chemistry Mcqs With Answers Chapter 10
12th Class Chemistry Mcqs With Answers Chapter 11	12th Class Chemistry Mcqs With Answers Chapter 12
12th Class Chemistry Mcqs With Answers Chapter 13	12th Class Chemistry Mcqs With Answers Chapter 14
12th Class Chemistry Mcqs With Answers Chapter 15	12th Class Chemistry Mcqs With Answers Chapter 16
12th Class Chemistry Mcqs With Answers Chapter 17	12th Class Chemistry Mcqs With Answers Chapter 18
12th Class Chemistry Mcqs With Answers Chapter 19	12th Class Chemistry Mcqs With Answers Chapter 20

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