Chemistry

1. Which of the following will undergo electrophilic aromatic substitution most readily? a. Pyrrole

1. Thiophene
2. Furan
3. Pyridine

2. Which of the following will undergo nucleophilic aromatic substitution most readily? a. Pyrrole[pic 1]

1. Thiophene
2. Furan
3. Pyridine

1. Which of the following will undergo electrophilic aromatic substitution most readily?

[pic 2]

1. Which of the following will undergo nucleophilic aromatic substitution most readily?

[pic 3]

1. [pic 4]Why is it necessary to convert pyridine to pyridine Noxide for the above reaction?

[pic 5]

1. To increase the nucleophilicity of the pyridine ring
2. All of the above

6. Suggest a suitable reagent for X in the above reaction.

1. KMnO4
2. PhCO2H
3. PhCO3H
4. O3

7. Suggest a suitable reagent for Y in the above reaction.

1. PPh3
2. PCl3
3. P(OMe)3
4. H3PO4

1. [pic 6]What is the name of the following synthesis?

[pic 7]

1. . Suggest a suitable reagent for X in the above         12. For the following reaction, suggest a suitable reaction scheme?         reagent X?

1. DDQ        a. EtMgBr
2. DBU         b. MeMgBr and EtBr
3. DMPU        c. NaH and EtI
4. DMAP        d. n-BuLi and MeBr (2 equivalents)[pic 8]

10. Which of the following is not a correct resonance structure intermediate in the following         13. What is the product of the following reaction?

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