Q: Which of the following is a constitutional isomer of $$\mathrm{C_5H_{12}}$$?

$$\mathrm{2,2\text{-}dimethylpropane}$$

Question 1

Which of the following is a constitutional isomer of $$\mathrm{C_5H_{12}}$$?

Accepted Answer

$$\mathrm{2,2	ext{-}dimethylpropane}$$

Question 2

Which of the following molecular formulas corresponds to a compound that must contain a ring?

Accepted Answer

$$\mathrm{C_4H_7Br}$$

Question 3

Which of the following statements best explains why $$\mathrm{CH_3COOH} ($$acetic acid) is a stronger acid than $$\mathrm{CH_3CH_2OH} ($$ethanol)?

Accepted Answer

The conjugate base of acetic acid is resonance stabilized.

Question 4

What is the IUPAC name for the following structure?

$$\mathrm{CH_3CH_2CH_2CH_2Br}$$

Accepted Answer

1-bromobutane

Question 5

Which of the following molecules has the highest boiling point?

Accepted Answer

$$\mathrm{CH_3CH_2CH_2CH_2OH} (1-$$butanol)

Question 6

Which of the following compounds is most soluble in water?

Accepted Answer

$$\mathrm{CH_3OH} ($$methanol)

Question 7

What is the hybridization of the central carbon atom in $$\mathrm{CH_2$=CH_2$} ($$ethylene)?

Accepted Answer

$$sp^2$$

Question 8

According to VSEPR theory, what is the geometry around the oxygen atom in water ($$\mathrm{H_2O}$$)?

Accepted Answer

Bent

Question 9

Which of the following molecules contains a chiral center?

Accepted Answer

$$\mathrm{CH_3CHBrCH_2CH_3} (2-$$bromobutane)

Question 10

Which of the following pairs of molecules are enantiomers?

Accepted Answer

A pair of molecules that are non-superimposable mirror images

Question 11

Which of the following best describes the relationship between cis-2-butene and trans-2-butene?

Accepted Answer

They are geometric (E/Z) isomers.

Question 12

Which of the following is the correct Fischer projection for D-glyceraldehyde?

Accepted Answer

The central carbon has the OH group on the right.

Question 13

Which of the following is the correct E/Z configuration for the double bond in $$\mathrm{CH_3CH=$$CHCH_3$$} (2-$$butene) when the two methyl groups are on opposite sides?

Accepted Answer

E-2-butene

Question 14

Which of the following is a correct IUPAC name for a molecule with the structure $$\mathrm{(CH_3$)_3CCH_2Cl}$$?

Accepted Answer

tert-butyl chloride

Question 15

Which of the following statements is true regarding the boiling points of alkanes, alkenes, and alkynes of similar molecular weight?

Accepted Answer

Alkynes generally have higher boiling points than alkenes and alkanes due to increased molecular polarity.

Question 16

Which of the following is a constitutional isomer of 1-bromobutane?

Accepted Answer

2-bromobutane

Question 17

Which of the following best describes the geometry around the central carbon in $$\mathrm{CO_2$}$$?

Accepted Answer

Linear

Question 18

Which of the following molecules is NOT a constitutional isomer of $$\mathrm{C_4H_{10}}$$?

Accepted Answer

Cyclobutane

Question 19

Which of the following best explains why tert-butyl chloride is less soluble in water than ethanol?

Accepted Answer

Ethanol can form hydrogen bonds with water, while tert-butyl chloride cannot.

Question 20

Which of the following is the correct absolute configuration (R/S) for the chiral center in (S)-2-butanol?

Accepted Answer

The OH group is on the left in the Fischer projection.

Organic Chemistry Midterm Practice: Step-by-Step Guidance

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