Q: Which of the following best describes the hybridization and approximate bond angle around the central carbon atom in methane ($$CH_4$$)?

$$sp^3$$ hybridization, bond angle $$109.5^\\circ$$

Q: Which of the following statements about the geometry of nitrogen in $$CH_3NHCH_3 is $$correct?

Nitrogen is tetrahedral with bond angles close to $$109.5^\\circ$$

Question 1

Which of the following best describes the hybridization and approximate bond angle around the central carbon atom in methane ($$CH_4$$)?

Accepted Answer

$$sp^3$$ hybridization, bond angle $$109.5^\circ$$

Question 2

Given the Lewis structure for glycine ($$NH_2CH_2COOH$$), which atom carries a formal negative charge in its deprotonated (zwitterionic) form at physiological pH?

Accepted Answer

One of the oxygen atoms in the carboxylate group

Question 3

Which of the following is the correct condensed structural formula for ethanol?

Accepted Answer

$$CH_3CH_2OH$$

Question 4

In the three-dimensional representation of $$CH_3NHCH_3$$, which convention is used to indicate a bond projecting behind the plane of the paper?

Accepted Answer

A dashed line

Question 5

Which of the following statements about the geometry of nitrogen in $$CH_3NHCH_3 is $$correct?

Accepted Answer

Nitrogen is tetrahedral with bond angles close to $$109.5^\circ$$

Question 6

Which of the following is NOT a correct statement about the structure and properties of organic molecules?

Accepted Answer

The geometry around a carbon atom with a triple bond is square planar

Question 7

Which of the following amino acids contains a sulfur atom in its side chain?

Accepted Answer

Methionine

Question 8

What is the correct IUPAC name for the molecule with the condensed formula $$CH_3CH_2CH_3$$?

Accepted Answer

Propane

Question 9

Which of the following best describes the electron-pair geometry and hybridization of the oxygen atom in water ($$H_2O$$)?

Accepted Answer

Tetrahedral, $$sp^3$$

Question 10

A student draws the Lewis structure for $$CH_3COOH ($$acetic acid) and assigns formal charges. Which atom is most likely to have a formal positive charge if the structure is drawn incorrectly?

Accepted Answer

The hydroxyl oxygen

Question 11

Which of the following is the correct Lewis structure for $$CH_3CH_2NH_2 ($$ethylamine)?

Accepted Answer

A two-carbon chain with an amino group ($$NH_2) $$attached to the first carbon

Question 12

Which of the following best explains why the bond angle in ammonia ($$NH_3) is $$less than the ideal tetrahedral angle?

Accepted Answer

The presence of a lone pair on nitrogen causes greater repulsion than bonding pairs

Question 13

Which of the following is a correct statement about the structure of proline, an amino acid used in proteins?

Accepted Answer

Proline contains a five-membered ring that includes the amino nitrogen

Question 14

Which of the following molecules has a central atom with $$sp^2$$ hybridization?

Accepted Answer

$$C_2H_4 ($$ethylene)

Question 15

Which of the following is the correct three-dimensional representation for the nitrogen atom in $$CH_3NHCH_3$$ using the hash-wedge convention?

Accepted Answer

One bond is shown as a solid wedge, one as a hash, and two as lines

Question 16

Which of the following statements about the 20 amino acid monomers used in proteins is correct?

Accepted Answer

All amino acids have a carboxyl group and an amino group attached to the same carbon

Question 17

Which of the following is the correct electron-pair geometry and bond angle for the carbon atom in $$CO_2$$?

Accepted Answer

Linear, $$180^\circ$$

Question 18

Which of the following is the correct IUPAC name for the molecule with the condensed formula $$CH_3CH_2CH_2OH$$?

Accepted Answer

Propanol

Question 19

Which of the following best describes the hybridization and geometry of the central atom in formaldehyde ($$CH_2O$$)?

Accepted Answer

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

Organic Chemistry: Structure, Nomenclature, and Properties of Organic Molecules (CHEM 350 Test 1 Review)

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