Acidity of Alkynes Quiz

What is the main focus of the lesson on alkynes?

• Chemical reactions involving alkynes

• Acidity of alkynes

• Physical properties of alkynes

• Naming alkynes

How does the acidity of terminal alkynes compare to alkanes and alkenes?

• More acidic than both

• Less acidic than both

• More acidic than alkanes but less than alkenes

• Less acidic than alkanes but more than alkenes

What is the approximate pKa range for terminal alkynes?

• 15 to 16

• 25 to 26

• 35 to 36

• 45 to 46

Why is sodium hydroxide not effective in deprotonating terminal alkynes?

• It is not a strong enough base

• It reacts with water instead

• It forms a precipitate

• It is too acidic

What is the pKa of water compared to terminal alkynes?

• Not comparable

• Equal to terminal alkynes

• Lower than terminal alkynes

• Higher than terminal alkynes

Which base is strong enough to deprotonate terminal alkynes?

• Sodium amide

• Sodium chloride

• Sodium hydroxide

• Sodium bicarbonate

What is the role of the amide ion in the reaction with terminal alkynes?

• Acts as a nucleophile

• Acts as a catalyst

• Acts as an acid

• Acts as a strong base

What is formed when a terminal alkyne is deprotonated by sodium amide?

• Ammonia

• Alkene

• Acetylide ion

• Alkane

What is the significance of acetylide ions in organic reactions?

• They are strong bases

• They are weak acids

• They are good nucleophiles

• They are inert

What is the pKa of ammonia compared to terminal alkynes?

• Higher than terminal alkynes

• Lower than terminal alkynes

• Equal to terminal alkynes

• Not comparable