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

Sagot :

pyromorphite
(2) butynu........................

Answer: 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: [tex]CH_4[/tex] is a hydrocarbon. [tex]H_2O,CO_2[/tex] are not considered as hydrocarbons.

For the given options:

Option 1: butanal

The chemical formula for this compound is [tex]CH_3CH_2CH_2CHO[/tex]

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 [tex]CH\equiv CCH_2CH_3[/tex]

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 [tex]CH_3CH(OH)-CH_2CH_3[/tex]

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 [tex]CH_3C(O)-CH_2CH_3[/tex]

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.

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