Which compound is classified as a hydrocarbon?
(1) butanal (3) 2-butanol
(2) butyne (4) 2-butanone

The correct answer is Option 2.

Explanation:

Hydrocarbons are defined as the compounds which have a covalent bond present between hydrogen and carbon atoms. For Example: is a hydrocarbon. are not considered as hydrocarbons.

For the given options:

Option 1: butanal

The chemical formula for this compound is

This is not considered as a hydrocarbon because a covalent bond is present between carbon and oxygen atom.

Option 2: butyne

The chemical formula for this compound is

This is considered as a hydrocarbon because covalent bonds are present between carbon and hydrogen atoms only.

Option 3: 2-butanol

The chemical formula for this compound is

This is not considered as a hydrocarbon because a covalent bond is present between carbon and oxygen atom.

Option 4: 2-butanone

The chemical formula for this compound is

This is not considered as a hydrocarbon because a covalent bond is present between carbon and oxygen atom.

From the above information, the correct answer is Option 2.

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.