Question 1

Which of the following best describes the correct order for naming an organic molecule according to IUPAC rules?

Accepted Answer

Prefix – Parent – Suffix

Question 2

Given the structure $\mathrm{CH_3CH_2CH_2CH=CH_2}$, what is the correct IUPAC name for this molecule?

Accepted Answer

1-pentene

Question 3

When naming an alkene or alkyne, from which end should you begin numbering the carbon chain?

Accepted Answer

From the end nearest the multiple bond (double or triple)

Question 4

What is the correct IUPAC name for the following structure: $\mathrm{CH_3C \equiv CCH_2CH_2CH_3}$?

Accepted Answer

2-pentyne

Question 5

Which of the following statements about cycloalkenes is TRUE?

Accepted Answer

Numbering begins at the double bond to give the substituent the lowest possible number.

Question 6

Which of the following molecules can exhibit cis–trans isomerism?

Accepted Answer

cis-2-pentene

Question 7

What is the bond angle around each carbon atom in ethylene (ethene)?

Accepted Answer

$120^\circ$

Question 8

Which of the following is the correct molecular formula for an alkane with 7 carbon atoms?

Accepted Answer

$\mathrm{C_7H_{16}}$

Question 9

Which of the following best describes the geometry and hybridization of the central carbon in propyne ($\mathrm{CH_3C \equiv CH}$)?

Accepted Answer

Linear, $sp$

Question 10

Which of the following reactions is an example of a hydrogenation reaction?

Accepted Answer

$\mathrm{CH_2=CH_2 + H_2 \xrightarrow{Pd} CH_3CH_3}$

Question 11

Which of the following is the major product when HBr is added to 2-methylpropene according to Markovnikov’s rule?

Accepted Answer

2-bromo-2-methylpropane

Question 12

Which of the following statements about the physical properties of alkenes and alkynes is FALSE?

Accepted Answer

They are more dense than water.

Question 13

Which of the following is a correct general formula for an alkyne?

Accepted Answer

$\mathrm{C_nH_{2n-2}}$

Question 14

Which of the following best explains why cis–trans isomerism is possible in some alkenes but not in alkanes?

Accepted Answer

Alkanes have free rotation around single bonds, while alkenes have restricted rotation around double bonds.

Question 15

Which of the following is the correct condensed formula for the product of the reaction: $\mathrm{CH_3CH_2CH=CH_2 + H_2 \xrightarrow{Pd}}$?

Accepted Answer

$\mathrm{CH_3CH_2CH_2CH_3}$

Question 16

Which of the following is NOT a type of organic reaction discussed in the study materials?

Accepted Answer

Polymerization

Question 17

Which of the following best describes the geometry around a carbon atom in methane ($\mathrm{CH_4}$)?

Accepted Answer

Tetrahedral, $109.5^\circ$

Question 18

Which of the following is a correct example of a rearrangement reaction?

Accepted Answer

cis-2-butene rearranging to trans-2-butene

Question 19

Which of the following is the correct IUPAC name for the molecule with the structure shown below?

$\mathrm{CH_3CH_2CH_2C(CH_3)=CHCH_3}$

Accepted Answer

4-methyl-2-hexene

Alkenes and Alkynes: Structure, Nomenclature, Properties, and Reactions

Study Guide - Practice Questions