Question 1

Which of the following best describes an addition reaction in organic chemistry?

Accepted Answer

A reaction where atoms are added to a molecule, resulting in the breaking of a double or triple bond and formation of new single bonds.

Question 2

In the context of addition reactions, what is the correct formula for the number of moles of reagent needed to fully react with an alkyne containing $$n$$ triple bonds?

Accepted Answer

$$2n$$

Question 3

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

Accepted Answer

Dehydration

Question 4

During a halogenation reaction, what is typically added to an alkene?

Accepted Answer

X$$_2 ($$where X is a halogen such as Cl$$_2 or Br$_2)$$

Question 5

What is the product when ethene ($$CH_2$$=$$CH_2) $$undergoes hydrogenation?

Accepted Answer

$$CH_3CH_3$$

Question 6

Which of the following reactions is an example of hydrohalogenation?

Accepted Answer

$$CH_2$$=$$CH_2 + $$HCl \rightarrow CH_3CH_2Cl$$

Question 7

If you start with 1 mole of an alkene and want to fully react it via halogenation, how many moles of halogen reagent are required?

Accepted Answer

1 mole

Question 8

Which of the following best explains why addition reactions are important in organic chemistry?

Accepted Answer

They enable the conversion of unsaturated compounds to saturated compounds, which is important in industrial and biological processes.

Question 9

A student mixes 1 mole of 1-butyne with excess $$H_2$$ and a catalyst. How many moles of $$H_2$$ are needed to fully hydrogenate the alkyne to butane?

Accepted Answer

2 moles

Question 10

Which of the following reactions is NOT an addition reaction?

Accepted Answer

$$CH_3CH_2OH \rightarrow CH_2$=CH_2$ + H_2O$$

Question 11

In the example provided, which reaction represents an addition reaction?

Accepted Answer

Reaction c: Alkene + HCl

Question 12

Which of the following best describes the change in bonding during an addition reaction to an alkene?

Accepted Answer

A double bond is converted to a single bond as new atoms are added.

Question 13

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

Accepted Answer

$$CH_3CH_2Br$$

Question 14

Which statement is TRUE regarding the number of bonds formed in an addition reaction to a triple bond?

Accepted Answer

Two new bonds are formed.

Question 15

A chemist wants to convert cyclohexene to cyclohexane. Which reagent should be used?

Accepted Answer

$$H_2$$ with a catalyst

Question 16

Which of the following is a correct general equation for the halogenation of an alkene?

Accepted Answer

$$RCH=CHR + X_2$ \rightarrow RCHX-CHRX$$

Question 17

Which of the following best describes the role of a catalyst in a hydrogenation reaction?

Accepted Answer

It increases the rate of reaction without being consumed.

Question 18

If 1 mole of an alkyne reacts with 2 moles of $$HBr$$, what is the expected product?

Accepted Answer

A dihalide with Br atoms added to adjacent carbons.

Question 19

Which of the following is a real-world application of addition reactions?

Accepted Answer

Production of margarine from vegetable oils via hydrogenation.

Question 20

Which of the following best explains why addition reactions are used in the pharmaceutical industry?

Accepted Answer

They allow for the synthesis of complex molecules by adding functional groups to unsaturated compounds.

Addition Reactions in Alkenes and Alkynes

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