Weekend Quiz 5-Name: Q1. Identify the nucleophilic atom in the following7. Which

Question

Weekend Quiz 5-Name: Q1. Identify the nucleophilic atom in the following7. Which of the following is the most stable cation? molecule. (Hint: looking for extra electrons!!) Due Date: 11/06/201 (remember more carbon bonded to carbocation makes it happier!) A. P B. C C. D. Me C. Q2. Identify the electrophilic atom in the following molecule. (Hint: look at carbon oxygen bond! Where are the electrons? Electronegativity?) Q8. For the following reaction step, indicate which pattern it belongs to. (What does THE arrow is telling us?) A. C B. H C. O of carbonyl D. C of carbonyl A. Proton Transfer B. Loss of Leaving Group C. Nucleophilic Attack D. Rearrangement Q3. Identify the electrophilic site in the following molecule. (Hint which one is more electronegative B or 0?) 09. For the following reaction step, indicate which pattern it belongs to.( Oxygen in methanol has electrons and carbon attached to oxygen is losing its electrons because...and if carbon is losing its electrons what are we going to call it?) A. C B. 0 C. B D. No electrophilic site A. Proton Transfer B. Loss of Leaving Group C. Nucleophilic Attack D. Rearrangement Q4. Which of the following cannot be a nucleophile? (what does a nucleophile have?) OH Q10. For the following reaction step, indicate which pattern it belongs to. (somebody is leaving!) D. Br Q5. Which of the following cannot be an electrophile? (What does an electrophile need?) A. Proton Transfer B. Loss of Leaving Group C. Nucleophilic Attack D. Rearrangement C. D. Br Q6. Which of the following is hydride? (Hydride is a hydrogen with an extra electron) B. H C. H D. H2

Explanation / Answer

Q1: option A is correct

Explanation: Phosphorous has lone pair of electrons so it is

Q2: option D is correct

Explanation: The electron density in C=O group is transferred towards oxygen atom due to the more electronegativity of oxygen atom. so carbonyl carbon gets a positive charge and oxygen atom gets a negative charge.

Q3: option C is correct

Explanation: Boron is less electronegative and it is electrophilic in nature.

Q4: option A cannot be a nucleophile.

Explanation: A nucleophile must possess negative charge or lone pair of electrons.

Q5: option D cannot be a electrophile.

Explanation: The nagtive charge on Br makes it nucleophile and it cannot be a electrophile. electrophile is a electron deficient species. Br- is a electron rich species.

Q6: option C is correct

Q7: option C is correct

Explanation: tertiary carbocation is more stable than secondary carbocation which is more stable than primary carbocation.

Q8: option A is correct

It is a proton transfer reaction. The electron density on oxygen atom attacks the proton and produces a oxonium cation as product.

Q9: option C is correct

Explanation: The electron density on oxygen atom of methanol attacks the cabonyl carbon and produces product. This reaction is called nucleophilic attack.

Q10: option B is correct

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