Alkynes

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Which type of hydrocarbons have one or more triple bonds between carbon atoms?

Alkenes

Alkanes

Alkynes (correct)

Alcohols

What is the general molecular formula of alkynes?

$C_nH_{2n+2}$

$C_nH_{2n}$

$C_nH_{2n-4}$

$C_nH_{2n-2}$ (correct)

Where is the triple bond located in a terminal alkyne?

In the middle of the carbon chain

At the end of the carbon chain (correct)

At the beginning of the carbon chain

Between two carbon atoms

What is the hybridization of each carbon in an alkyne?

sp Signup and view all the answers

How many degrees of unsaturation does a triple bond introduce in an alkyne?

Two Signup and view all the answers

What suffix is used in the IUPAC system to name alkynes?

-yne Signup and view all the answers

What type of reaction is used to prepare alkynes from vicinal dihalides?

E2 elimination reaction Signup and view all the answers

How are geminal dihalides defined?

Dihalides with both halogens on the same carbon Signup and view all the answers

What is the key feature that allows alkynes to undergo various reactions?

Strong π bonds Signup and view all the answers

In the context of alkynes, what does 'terminal alkynes' refer to?

Alkynes with a hydrogen at the terminal carbon Signup and view all the answers

Why are sp hybridized C−H bonds in terminal alkynes considered more acidic?

Because sp hybridization holds negative charge closer to the nucleus Signup and view all the answers

In alkynes, which type of reaction is responsible for forming products with four new bonds?

Addition reaction Signup and view all the answers

What is the IUPAC name of the simplest alkyne, H-C≡C-H?

Ethyne Signup and view all the answers

What is the name given to a two-carbon alkyl group derived from acetylene?

Ethynyl group Signup and view all the answers

What are compounds with both a double and triple bond named as?

Enynes Signup and view all the answers

Which of the following statements about the physical properties of alkynes is true?

Melting point and boiling point increase as the number of carbons increases. Signup and view all the answers

What product is formed when acetylene burns in oxygen?

$CO_2$ and $H_2$O Signup and view all the answers

What is acetylene commonly used for due to its very hot flame when combined with oxygen?

Welding Signup and view all the answers

What is the resulting ion when a terminal alkyne is deprotonated with a strong base?

Acetylide ion Signup and view all the answers

What type of reaction do alkynes undergo when reacting with electrophiles?

Electrophilic addition of HX Signup and view all the answers

In hydrohalogenation of alkynes, what does the addition of one mole of HX typically form?

Vinyl halide Signup and view all the answers

What is the Brønsted-Lowry acid-base reaction product when a terminal alkyne is deprotonated by a strong base?

Acetylide ion Signup and view all the answers