Question

Compare a six-carbon open-chain (noncyclic) hydrocarbon alkane, alkene, and alkyne. Which of these compounds would have the fewest number of hydrogen atoms?
A) the alkane
B) the alkyne
C) the alkene
D) all of these have the same number of hydrogen atoms
E) none of these contain hydrogen atoms

Answer 1

Option B; The alkyne compounds would have the fewest number of hydrogen atoms.

A hydrocarbon that is unsaturated and has at least one triple bond in the carbon atom is called an alkyne.  A homologous series with the generic chemical formula CnH2n-2 is formed by the simplest acyclic alkynes, which have just one triple bond and no other functional groups. Although the name acetylene also explicitly applies to C2H2, which is formally known as ethyne using IUPAC nomenclature, alkynes are typically referred to as acetylenes. Alkynes, like other hydrocarbons, are often hydrophobic. With a binding strength of 839 kJ/mol, the triple bond is quite powerful. Sigma bond strength is 369 kJ/mol, first pi bond strength is 268 kJ/mol, and second pi bond strength is 202 kJ/mol. The triple bond is recognized as resulting from the overlap of the s and p orbitals in the context of molecular orbital theory, which is where bonding is typically discussed.

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