Question 1

Which of the following statements best describes the geometry around a carbon atom in methane (CH\_4)?

Accepted Answer

Tetrahedral with bond angles of $$109.5^\circ$$

Question 2

Which general formula correctly represents alkanes?

Accepted Answer

$$C_nH_{2n+2}$$

Question 3

What is the main reason alkanes are considered excellent non-polar solvents?

Accepted Answer

They lack polar functional groups and have strong C–C and C–H bonds

Question 4

Which type of hydrocarbon contains at least one carbon–carbon triple bond?

Accepted Answer

Alkyne

Question 5

What is the correct IUPAC name for the following structure: CH\_3–CH(CH\_3)–CH\_2–CH\_3?

Accepted Answer

2-Methylbutane

Question 6

Which statement about structural isomers is correct?

Accepted Answer

They have the same molecular formula but different connectivity of atoms

Question 7

Why do alkenes not rotate freely about the double bond?

Accepted Answer

Because the $$\pi$$ bond must be broken to allow rotation

Question 8

Which hybridization is found in the carbon atoms of ethene (C\_2H\_4)?

Accepted Answer

$$sp^2$$

Question 9

What is the product of the following reaction: $$H_2C=CH_2$ + Br_2$ \rightarrow$$ ?

Accepted Answer

1,2-dibromoethane

Question 10

Which statement best explains why benzene is unusually stable?

Accepted Answer

Its $$\pi$$ electrons are delocalized over all six carbon atoms

Question 11

Which type of reaction do aromatic hydrocarbons typically undergo?

Accepted Answer

Substitution reactions

Question 12

A compound with a carbon atom bonded to four different groups is described as:

Accepted Answer

Chiral

Question 13

Which statement about enantiomers is true?

Accepted Answer

They have identical boiling points but behave differently in chiral environments

Question 14

The (R)-enantiomer of thalidomide is:

Accepted Answer

Effective against morning sickness

Question 15

Proteins are polymers of:

Accepted Answer

Amino acids

Question 16

What type of bond is formed between the amine group of one amino acid and the carboxyl group of another?

Accepted Answer

Peptide bond

Question 17

Which level of protein structure is defined by the sequence of amino acids?

Accepted Answer

Primary structure

Question 18

Which of the following best describes the difference between cis- and trans-alkenes?

Accepted Answer

Cis-alkenes have substituents on the same side of the double bond; trans-alkenes have them on opposite sides

Question 19

Which hybridization is associated with a carbon atom in a linear geometry?

Accepted Answer

$$sp$$

Question 20

During the addition of HBr to propene, what is formed in the first step of the mechanism?

Accepted Answer

A carbocation intermediate

Chemistry of Life: Organic and Biological Chemistry – Study Notes

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