ACS CP Organic, Inorganic & Physical Chemistry 2

Question 1

Which reagent converts a primary alcohol to an aldehyde without over-oxidizing to a carboxylic acid?

Accepted Answer

PCC (pyridinium chlorochromate)

Answer

PCC selectively oxidizes primary alcohols to aldehydes and stops there because it is a mild, anhydrous oxidant.

Question 2

In crystal field theory, which geometry produces the largest crystal field splitting (Δ) for the same metal and ligands?

Accepted Answer

Octahedral

Answer

Octahedral complexes have six ligands interacting with d orbitals along all three axes, producing the largest Δ.

Question 3

The Clausius-Clapeyron equation relates vapor pressure to temperature. What does the slope of ln(P) vs 1/T represent?

Accepted Answer

-ΔHvap/R

Answer

The Clausius-Clapeyron equation is d(ln P)/d(1/T) = -ΔHvap/R, so the slope equals -ΔHvap/R.

Question 4

Which of the following best describes a transesterification reaction?

Accepted Answer

An ester reacting with an alcohol to exchange the alkoxy group

Answer

Transesterification is the exchange of an alkoxy group between an ester and an alcohol, often acid- or base-catalyzed.

Question 5

For a coordination compound with formula [Co(NH₃)₄Cl₂]Cl, how many moles of ions are produced per formula unit when fully dissociated in water?

Accepted Answer

2

Answer

The complex ion [Co(NH₃)₄Cl₂]⁺ and one Cl⁻ counter-ion dissociate, giving 2 moles of ions per formula unit.

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