Question 1

Which of the following best describes the geometry of a carbon atom with four single covalent bonds?

Accepted Answer

It forms a tetrahedral shape with 109.5° bond angles.

Question 2

Which functional group is characterized by the formula $$\mathrm{X{-}OH}$$ and is commonly found in alcohols?

Accepted Answer

Hydroxyl group

Question 3

A molecule with the formula $$\mathrm{C_2H_6O}$$ can exist as either ethanol or dimethyl ether. What type of isomerism does this illustrate?

Accepted Answer

Structural isomerism

Question 4

Which statement about carbon-carbon double bonds is correct?

Accepted Answer

They restrict rotation, leading to the possibility of cis-trans isomerism.

Question 5

Which of the following is NOT a property of the methyl group ($$\mathrm{X{-}CH_3$}$$)?

Accepted Answer

It is polar and forms hydrogen bonds.

Question 6

Which functional group is responsible for the acidic properties of amino acids?

Accepted Answer

Carboxyl group

Question 7

Which of the following best explains why functional groups are important in organic chemistry?

Accepted Answer

They dictate the chemical reactivity and properties of organic molecules.

Question 8

Which of the following pairs are stereoisomers but NOT enantiomers?

Accepted Answer

cis-2-butene and trans-2-butene

Question 9

A molecule contains a $$\mathrm{X{-}NH_2$}$$ group. What property does this group impart to the molecule?

Accepted Answer

It makes the molecule weakly basic.

Question 10

Which of the following statements about enantiomers is TRUE?

Accepted Answer

They are mirror images that cannot be superimposed.

Question 11

Which functional group is found in nucleic acids and is responsible for their acidic properties?

Accepted Answer

Phosphate group ($$\mathrm{X{-}PO_4$})$$

Question 12

Which of the following is a correct statement about the freedom of rotation in carbon bonds?

Accepted Answer

Single bonds allow free rotation, while double bonds restrict rotation.

Question 13

Which functional group is essential for the formation of disulfide bridges in proteins?

Accepted Answer

Sulfhydryl group ($$\mathrm{X{-}SH})$$

Question 14

A molecule with the same covalent arrangement of atoms but a different spatial orientation around a double bond is classified as:

Accepted Answer

Cis-trans isomer

Question 15

Which of the following best describes the carboxyl group ($$\mathrm{X{-}COOH}$$)?

Accepted Answer

Weakly acidic and found in organic acids

Question 16

Which of the following molecules contains only hydrogen and carbon atoms?

Accepted Answer

Hydrocarbon

Question 17

Which functional group is polar and commonly found in sugars and alcohols?

Accepted Answer

Hydroxyl group ($$\mathrm{X{-}OH})$$

Question 18

Which of the following is an example of a biologically important enantiomer pair?

Accepted Answer

D-glucose and L-glucose

Question 19

Which property is shared by all organic compounds?

Accepted Answer

They all contain carbon atoms bonded to hydrogen.

Question 20

A molecule contains both a carboxyl group and an amino group. Which class of biological molecule does it most likely belong to?

Accepted Answer

Amino acid

Chapter 4 Notes

Guida di studio - Domande di pratica