1. Rank the alanes below in order of increasing relative Lewis acidity (1 is most acidic, 4 is least acidic). Provide a brief explanation for your ordering. AlCl3 Al(Et)3 Rank: AICI(Et)2 AlCl2(Et)

Pyridine forms a stronger Lewis acid-base complex with SO3 than SO2. However, pyridine forms a weaker complex with SF6 than with SF4. Explain the difference.

Aniline (conjugate acid pKa 4.63) is a considerably stronger base than diphenylamine (pKa 0.79). Account for these marked differences.

3. Which anion is the weakest base? (A) (B) 4. For the structure shown below, which is the least acidic hydrogen? (В) (A) но- (D) -NH3* CO2H (C) 5. Which of the following compounds will be the most reactive toward nucleophilic attach? OCH3 (A) `CI (B) `NH2 (D) (C) 6. What is the product of following reaction sequence? Choose fro answers A, B, and C. NaOCH3 CH3I(Excess) ? Он B

6. Which of the following statements concerning ethanoic acid are correct? (1) It cannot be completely neutralized by sodium hydroxide. (2) Some colourless gas will be given out when it reacts with calcium granules. (3) It is a monobasic acid. (1) and (2) only (1) and (3) only (2) and (3) only D. (1), (2) and (3) 7. Which of the following compounds is a soluble base? А. В. С. Lead(II) oxide Iron(II) sulphate Potassium hydroxide А. В. С. D. Zinc oxide 8. Which of the following pairs of species are conjugate acid-base pairs? А. HІ, NaOH В. Н.РО, РО, С. Н.О", ОН" D. H,SO4, HSO,

The following compound is being tested by Pfizer a drug candidate to treat Covid-19. There are multiple amide bonds in the structure that provide rigidity. There is another carbon that has the same oxidation state as a carboxylic acid derivative. Which carbon is it? F3C -NH HN PF-07321332 Selected Coordinates Clear

Show how acid derivatives hydrolyze to carboxylic acids under either acidic or basicconditions. Explain why some acid derivatives (amides, for example) require muchstronger conditions for hydrolysis than other derivatives.

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Treatment of indene with NaNH2 forms its conjugate base in a Brønsted–Lowry acid–base reaction. Draw all reasonable resonance structures forindene's conjugate base, and explain why the pKa of indene is lower thanthe pKa of most hydrocarbons.