Organic Chemistry: Alkynes Identification

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Questions and Answers

What is the functional group of the given compound?

Alkene

Alkane

Alkyne (correct)

Aromatic

What type of bond is present between the two carbon atoms in the given compound?

Single bond

Double bond

Triple bond (correct)

Quadruple bond

What is the general formula for an alkyne?

CnH2n

CnH2n-2 (correct)

CnH2n+1

CnH2n+2

What is the suffix used to name alkynes?

-yne Signup and view all the answers

How many pi bonds are present in the given compound?

3 Signup and view all the answers

What type of bond is holding the hydrogen in acidic compounds?

Polar bond Signup and view all the answers

What is the charge of the hydrogen ion when it separates from the acidic compound?

Positive Signup and view all the answers

What type of atoms are commonly found in acidic compounds?

N, O, S, X atoms Signup and view all the answers

What is the reason for the acidity of a compound?

The polarity of the bond holding the hydrogen Signup and view all the answers

What happens to the hydrogen ion when it separates from the acidic compound?

It becomes a positive ion Signup and view all the answers

What type of bond is present in acetylene or any alkyne with the triple bond at the end of the chain?

Triply-bonded carbon Signup and view all the answers

What is the property exhibited by hydrogen attached to triply-bonded carbon?

Acidity Signup and view all the answers

What is the general formula of an alkyne with the triple bond at the end of the chain?

RC=C-H Signup and view all the answers

What is the reason for the acidity of hydrogen attached to triply-bonded carbon?

Due to the presence of a triple bond Signup and view all the answers

What is acidity a measure of?

The tendency of a compound to lose a hydrogen ion. Signup and view all the answers

What type of compound is acetylene or any alkyne with the triple bond at the end of the chain?

Alkyne Signup and view all the answers

What is the result of a compound losing a hydrogen ion?

The compound becomes an acid. Signup and view all the answers

What is the relationship between acidity and hydrogen ions?

Acidity is the tendency to lose hydrogen ions. Signup and view all the answers

What does a high acidity measure indicate?

The compound is likely to lose a hydrogen ion. Signup and view all the answers

What is the role of hydrogen ions in acidity?

Hydrogen ions are lost during acid formation. Signup and view all the answers

What is the product formed when pent-1-ene is treated with bromine under conditions that facilitate the formation of a dihalide?

1,4-dibromo-1-pentene Signup and view all the answers

What is the major product formed when excess bromine is added to pent-1-ene?

1,2,4,5-tetrabromo pentane Signup and view all the answers

What is the product formed when 1,3-butadiene is treated with bromine under similar conditions?

3,4-dibromo-1-butene and 1,4-dibromo-2-butene Signup and view all the answers

Why does the treatment of 1,3-butadiene with bromine yield two products?

Due to the formation of a resonance-stabilized intermediate Signup and view all the answers

What is the expected product when 1,3-butadiene is treated with bromine under similar conditions?

3,4-dibromo-1-butene Signup and view all the answers

Study Notes

Acidity of Alkynes

Acidity is the tendency of a compound to lose a hydrogen ion.
Hydrogen attached to triply-bonded carbon (e.g., acetylene or RC=C-H) shows appreciable acidity due to the polar bond holding the hydrogen.

Reactions of Alkynes with Bromine

1-Butyne reacts with bromine to form 1,4-dibromo-2-butene.
Further addition of bromine yields 1,2,4,5-tetrabromo pentane.

Reactions of Dienes with Bromine

1,3-Butadiene reacts with bromine to form 3,4-dibromo-1-butene and 1,4-dibromo-2-butene under similar conditions.

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Description

Identify the names of alkynes in this quiz from Organic Chemistry Lecture 5, covering alkynes and dienes.