12th Class Chemistry Mcqs With Answers Chapter 10| 2nd Year chemistry mcqs with answers pdf
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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:
- CH3F
- CH3Cl
- CH3Br
- CH3I
2. Which of the following is not nucleophile choose which one is correct:
- H2O
- H2S
- BF3
- NH3
3. Carbocation is a/an choose which one is correct:
- Electrophile
- Nucleophile
- Free radical
- Group of atoms
4. 1-bromobutane on reaction with alcoholic potassium hydroxide gives choose which one is correct:
- 1-butanol
- 1-butene
- 2-butene
- 1-butyne
5. SN2 reaction can be best carried out with choose which one is correct:
- Primary alkyl halide
- Secondary alkyl
- Tertiary alkyl halide
- All of above
6. For which mechanism the first step involved is the same choose which one is correct:
- E1 and E2
- E2 and SN2
- SN1 and E2
- E1 and SN1
7. In the transition state of SN2 mechanism reaction with alkhyl halides, which of the following orbital hybridization is involved choose which one is correct:
- Sp3
- Sp2
- sp
- dsp
8. Which of the following factors does not affect the SN1 rate is choose which one is correct:
- Nucleophilicity of the attacking nucleophile
- Stability of the carbonium ion
- Solvent system
- The nature of leaving group
9. In β-elimination reaction, nucleophile attacks on choose which one is correct:
- α-hydrogen
- β-hydrogen
- Hydrogen
- α-carbon
10. The substances which donates a pair of electron to electrophile are called choose which one is correct:
- Electrophile
- Nucleophile
- Lewis acid
- Dibasic acid
11. Which one the following will be present at the position of letter B C2H5Br KOH
Alcohol A H2/Pt
⎯⎯⎯→
⎯⎯⎯→ B
- Ethyl alcohol
- Acetaldehyde
- Ethene
- Ethane
12. In unimolecular reactions, the reaction completes in choose which one is correct:
- One step
- Two steps
- Three steps
- None of these
13. Grignard’s reagent reacts to form alkane with choose which one is correct:
- Water
- Ammonia
- Ethanol
- All of these
14. Grignard’s reagents produce primary alcohol with choose which one is correct:
- Formaldehyde
- Epoxide
- Acetaldehyde
- Both A. and (b)
15. Carbanions are choose which one is correct:
- Electrophile
- Nucleophile
- Free radical
- Group of atoms
16. Which substance is used to convert alcohol to alkyl halide choose which one is correct:
- SOCl2
- PCl3
- HCl + ZnCl2
- All of these
17. Ethyl bromide when reduced with nascent hydrogen the product will be choose which one is correct:
- Ethyl alcohol
- Ethane
- Butane
- Propane
18. When bromomethane is hydrolyzed by aqueous NaOH solution which ion brings about the first stage of substitution choose which one is correct:
- Na+
- OH−
- Anyone
- 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 SN2 mechanism choose which one is correct:
- 100% inversion of configuration
- 2nd order kinetics
- Tertiary alkyl halides
- Change of hybridization from sp3to sp2in transition state
21. Grignard reagent is reactive due to choose which one is correct:
- The presence of halogen atom
- The presence of Mg atom
- The polarity of C − Mg bond
- Electrophilic carbon
22. Reaction of C2H5MgBr with CO2 is an example of choose which one is correct:
- Electrophilic substitution
- Nucleophilic substitution
- Electrophilic addition
- Nucleophilic addition
23. Which one of the following is not a nucleophile choose which one is correct:
- CH3 − NH2
- CH2 = CH2
- OH−
- CH+3
24. Acetic acid can be obtained from CH3MgI by treatment with choose which one is correct:
- H2O
- ClNH2
- CO2
- HCHO