Question 1

Which of the following statements best explains why the carbonyl group is highly reactive in organic reactions?

Accepted Answer

The carbonyl carbon is sp\^2 hybridized and the C=O bond is polarized due to the electronegativity of oxygen, making the carbon electrophilic.

Question 2

What is the correct IUPAC name for the following compound: $$\mathrm{CH_3CH_2CH_2COCH_3}$$?

Accepted Answer

2-pentanone

Question 3

Which of the following best describes the hydrogen bonding behavior of aldehydes and ketones?

Accepted Answer

They cannot hydrogen bond to themselves, but can accept hydrogen bonds from donor molecules such as water.

Question 4

A student wants to synthesize cyclohexanecarbaldehyde from cyclohexylmethanol. Which reagent would be most appropriate for this transformation?

Accepted Answer

$$\mathrm{NaOCl} ($$TEMPO)

Question 5

Which of the following sequences would best convert a carboxylic acid to an aldehyde?

Accepted Answer

1. $$\mathrm{$$SOCl_2$$}$$; 2. $$\mathrm{LiAlH(OtBu)_3}$$

Question 6

Which of the following best explains why acetone ($$\mathrm{CH_3COCH_3}) $$has a higher boiling point than propane ($$\mathrm{CH_3CH_2CH_3}$$)?

Accepted Answer

Acetone has a polar carbonyl group, allowing for dipole-dipole interactions.

Question 7

A chemist reacts a nitrile ($$\mathrm{R-CN}) $$with a Grignard reagent ($$\mathrm{R'MgX}) $$followed by aqueous workup. What is the major product?

Accepted Answer

A ketone

Question 8

Which of the following is the correct IUPAC name for the compound shown below?

$$\mathrm{CH_3CH_2CH(OH)COCH_2CH_3}$$

Accepted Answer

5-hydroxyhexan-3-one

Question 9

Which reagent is most selective for reducing esters to aldehydes?

Accepted Answer

$$\mathrm{DIBAL-H} at$$ $$-78^\circ\mathrm{C}$$

Question 10

In the Friedel-Crafts acylation reaction, which of the following is required to generate an aromatic ketone?

Accepted Answer

An acid chloride and $$\mathrm{$$AlCl_3$$}$$

Question 11

Which of the following best describes the product of ozonolysis of 1-methylcyclohexene followed by reductive workup with $$(CH_3$)_2S$$?

Accepted Answer

6-oxoheptanal

Question 12

Which of the following statements about the nomenclature of aldehydes is correct?

Accepted Answer

The aldehyde carbonyl carbon is always assigned as carbon-1 in the parent chain.

Question 13

Which of the following synthetic routes would best convert an alkyne to an aldehyde?

Accepted Answer

1. $$\mathrm{Sia_2BH}$$; 2. $$\mathrm{H_2O_2}$$, $$\mathrm{NaOH}$$

Question 14

A student attempts to reduce a carboxylic acid to an aldehyde using $$\mathrm{$$LiAlH_4$$}$$ directly. What is the expected product?

Accepted Answer

A primary alcohol

Question 15

Which of the following best explains why ketones generally have higher boiling points than alkanes of similar molecular weight?

Accepted Answer

Ketones can form strong dipole-dipole interactions due to the polar C=O bond.

Question 16

Which of the following is a correct statement about the reactivity of Grignard reagents with acid chlorides and ketones?

Accepted Answer

Grignard reagents react with acid chlorides to give tertiary alcohols after two additions.

Question 17

Which of the following best describes the product of the reaction of ethyl cyclopentanecarboxylate with DIBAL-H at $$-78^\circ\mathrm{C}$$ followed by aqueous workup?

Accepted Answer

Cyclopentanecarbaldehyde

Question 18

Which of the following is the correct IUPAC name for the compound $$\mathrm{PhCH_2CH_2CHO}$$?

Accepted Answer

3-phenylpropanal

Question 19

Which of the following statements about the use of DIBAL-H in organic synthesis is correct?

Accepted Answer

DIBAL-H can selectively reduce esters to aldehydes at low temperature.

Aldehydes and Ketones: Structure, Nomenclature, Properties, and Synthesis

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