Step 1: Identify the structure of But-2-ene-1-yne.
But-2-ene-1-yne is an organic compound with a double bond between carbon atoms at position 2 (C=C), a triple bond between carbon atoms at position 1 (C≡C), and a C−H bond for the hydrogen atoms attached to the carbon atoms.
Step 2: Count the C−C bonds.
The number of C−C bonds is 4 because of the chain of carbon atoms, including the single bonds (C−C) and the double bond (C=C).
Step 3: Count the C−H bonds.
The number of C−H bonds depends on the number of hydrogens attached to each carbon atom. The compound contains 2 C−H bonds per C−C group.
Step 4: Count the C=C bonds.
There is one C=C bond in the molecule, formed by the double bond between the second and third carbon atoms in the molecule.