Alkynes
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Questions and Answers

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?

    <p>sp</p> Signup and view all the answers

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

    <p>Two</p> Signup and view all the answers

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

    <p>-yne</p> Signup and view all the answers

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

    <p>E2 elimination reaction</p> Signup and view all the answers

    How are geminal dihalides defined?

    <p>Dihalides with both halogens on the same carbon</p> Signup and view all the answers

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

    <p>Strong π bonds</p> Signup and view all the answers

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

    <p>Alkynes with a hydrogen at the terminal carbon</p> Signup and view all the answers

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

    <p>Because sp hybridization holds negative charge closer to the nucleus</p> Signup and view all the answers

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

    <p>Addition reaction</p> Signup and view all the answers

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

    <p>Ethyne</p> Signup and view all the answers

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

    <p>Ethynyl group</p> Signup and view all the answers

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

    <p>Enynes</p> Signup and view all the answers

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

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

    What product is formed when acetylene burns in oxygen?

    <p>$CO_2$ and $H_2$O</p> Signup and view all the answers

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

    <p>Welding</p> Signup and view all the answers

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

    <p>Acetylide ion</p> Signup and view all the answers

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

    <p>Electrophilic addition of HX</p> Signup and view all the answers

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

    <p>Vinyl halide</p> 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?

    <p>Acetylide ion</p> Signup and view all the answers

    Which rule governs the hydrohalogenation of alkynes, leading to the formation of geminal dihalides?

    <p>Markovnikov's rule</p> Signup and view all the answers

    Alkynes can react with electrophiles through three addition reactions.

    <p>False</p> Signup and view all the answers

    In hydrohalogenation of alkynes, the addition of one mole of HX typically forms a geminal dihalide directly.

    <p>False</p> Signup and view all the answers

    Hydrohalogenation of alkynes follows Markovnikov's rule.

    <p>False</p> Signup and view all the answers

    A terminal alkyne can be deprotonated by a strong base in a Lewis acid-base reaction.

    <p>False</p> Signup and view all the answers

    Geminal dihalides are defined as having halogens attached to adjacent carbon atoms.

    <p>True</p> Signup and view all the answers

    Alkynes have the ability to form products with four new bonds due to their double bond.

    <p>False</p> Signup and view all the answers

    Sp hybridized C−H bonds in terminal alkynes are considered less acidic compared to other hybridizations.

    <p>False</p> Signup and view all the answers

    Acetylene is commonly used for its very cold flame when combined with oxygen.

    <p>False</p> Signup and view all the answers

    Compounds with both a double and triple bond are named as alkadienes.

    <p>False</p> Signup and view all the answers

    The hydrohalogenation of alkynes leads to the formation of geminal dihalides following Markovnikov's rule.

    <p>False</p> Signup and view all the answers

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