Question 1

Which of the following compounds contains a carbonyl functional group?

Accepted Answer

Acetone ($CH_3COCH_3$)

Question 2

What is the IUPAC name for the following structure: $CH_3CH_2CH(CH_3)CH_2CH_3$?

Accepted Answer

2-Methylpentane

Question 3

Which of the following statements about alkanes is TRUE?

Accepted Answer

Alkanes are saturated hydrocarbons with only single bonds.

Question 4

Which functional group is present in the following molecule: $CH_3CH_2SH$?

Accepted Answer

Thiol

Question 5

A molecule with the formula $C_4H_{10}$ can exist as which of the following pairs of constitutional isomers?

Accepted Answer

Butane and isobutane

Question 6

Which of the following is the most stable conformation of ethane?

Accepted Answer

Staggered conformation

Question 7

What is the correct IUPAC name for the following compound: $CH_3CH_2CH_2CH_2CH_3$?

Accepted Answer

Pentane

Question 8

Which of the following functional groups contains a carbon-oxygen double bond?

Accepted Answer

Ketone

Question 9

Which of the following is a secondary alkyl group?

Accepted Answer

Isopropyl ($-CH(CH_3)_2$)

Question 10

Which of the following molecules is an example of an ester functional group?

Accepted Answer

Ethyl acetate ($CH_3COOCH_2CH_3$)

Question 11

Which of the following statements best explains why the staggered conformation of ethane is more stable than the eclipsed conformation?

Accepted Answer

Staggered conformation minimizes torsional strain due to electron repulsion between C-H bonds.

Question 12

Which of the following is the correct IUPAC name for a molecule with the structure $CH_3CH(CH_3)CH_2CH_2CH_3$?

Accepted Answer

2-Methylpentane

Question 13

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

Accepted Answer

2-Methylbutane

Question 14

Which functional group is present in Ibuprofen?

Accepted Answer

Carboxylic acid

Question 15

Which of the following molecules contains a quaternary carbon atom?

Accepted Answer

Neopentane ($C(CH_3)_4$)

Question 16

Which of the following is the correct IUPAC name for a molecule with two methyl groups on the third and fourth carbons of a pentane chain?

Accepted Answer

3,4-Dimethylpentane

Question 17

Which of the following is a correct representation of a Newman projection for the most stable conformation of butane?

Accepted Answer

Staggered conformation with methyl groups anti to each other (180° apart)

Question 18

Which of the following functional groups is found in capsaicin, the pungent substance in chili peppers?

Accepted Answer

Aromatic ring

Question 19

Which of the following statements about the boiling points of alkanes is correct?

Accepted Answer

Boiling points increase as the number of carbons in the alkane increases.

Question 20

Which of the following is the correct IUPAC name for a molecule with the structure $CH_3CH_2CH(CH_3)CH_2CH_2CH_3$?

Accepted Answer

3-Methylhexane

Organic Compounds: Alkanes and Functional Groups – Study Notes

Study Guide - Practice Questions