Question 1

Which of the following statements correctly describes the difference between a sigma ($$\sigma) $$bond and a pi ($$\pi) $$bond?

Accepted Answer

A $$\sigma$$ bond is formed by the head-on overlap of orbitals, while a $$\pi$$ bond is formed by the side-to-side overlap of p orbitals.

Question 2

Given the isotope $$^{37}_{17}\mathrm{Cl}$$, which of the following is correct?

Accepted Answer

Atomic number: 17, Protons: 17, Neutrons: 20, Electrons: 17

Question 3

Which of the following molecules is non-polar, despite having polar bonds?

Accepted Answer

$$\mathrm{CO}_2$$

Question 4

What is the hybridization and geometry around the central carbon atom in formaldehyde ($$\mathrm{CH}_2\mathrm{O}$$)?

Accepted Answer

sp$$^2$$ hybridization, trigonal planar geometry

Question 5

Which of the following correctly ranks the intermolecular forces from weakest to strongest?

Accepted Answer

London dispersion \u003c Dipole-dipole \u003c Hydrogen bonding

Question 6

Which of the following is the correct Lewis structure for the nitrate ion ($$\mathrm{NO}_3^-$$)?

Accepted Answer

A resonance hybrid with three equivalent N–O bonds, each with a bond order of 1.33.

Question 7

Which of the following functional groups is present in acetone?

Accepted Answer

Ketone

Question 8

Which of the following is the correct IUPAC name for the molecule with the structure $$\mathrm{CH}_3\mathrm{CH}_2\mathrm{CH}_2\mathrm{CH}_3$$?

Accepted Answer

Butane

Question 9

Which of the following statements about Newman projections is correct?

Accepted Answer

The staggered anti conformation is the most stable conformation for butane.

Question 10

Which of the following best describes the difference between constitutional isomers and stereoisomers?

Accepted Answer

Constitutional isomers have different connectivity; stereoisomers have the same connectivity but different spatial arrangement.

Question 11

Which of the following molecules is an example of a Brønsted-Lowry acid?

Accepted Answer

$$\mathrm{HCl}$$

Question 12

What is the formal charge on the nitrogen atom in the ammonium ion ($$\mathrm{NH}_4^+$$)?

Accepted Answer

+1

Question 13

Which of the following best explains why cyclopropane is less stable than cyclohexane?

Accepted Answer

Cyclopropane has significant angle strain due to its 60° bond angles.

Question 14

Which of the following is the correct condensed structural formula for 2-methylpropane?

Accepted Answer

$$\mathrm{(CH}_3)_3\mathrm{CH}$$

Question 15

Which of the following statements about the relationship between acid strength and $$K_a (or$$ $$pK_a) is $$correct?

Accepted Answer

A lower $$pK_a$$ value indicates a stronger acid.

Question 16

Which of the following best describes the geometry and hybridization of the carbon atom in ethyne ($$\mathrm{C}_2\mathrm{H}_2$$)?

Accepted Answer

Linear, sp hybridized

Question 17

Which of the following is a correct resonance structure for the acetate ion ($$\mathrm{CH}_3\mathrm{COO}^-$$)?

Accepted Answer

A structure with a double bond between carbon and one oxygen, and a single bond between carbon and the other oxygen, with a negative charge on the singly bonded oxygen.

Question 18

Which of the following best describes the difference between 'sec-butyl' and 'tert-butyl' groups?

Accepted Answer

'Sec-butyl' is a four-carbon group attached via a secondary carbon; 'tert-butyl' is attached via a tertiary carbon.

Question 19

Which of the following is the most stable conformation for methylcyclohexane?

Accepted Answer

The conformation with the methyl group in the equatorial position.

Question 20

Which of the following best describes the cause of torsional strain in alkanes?

Accepted Answer

Repulsion between electrons in bonds on adjacent atoms when they are eclipsed.

Organic Chemistry I: Study Guide for Chapters 1–4

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