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A hydrocarbon molecule has seven carbon

atoms in a straight chain. There is a double bond

between the third carbon atom and the fourth

carbon atom in the chain. The IUPAC name for

this hydrocarbon is

(1) 3-heptyne (3) 3-heptene

(2) 4-heptyne (4) 4-heptene

Verified Answer :

Answer: Option (3) is the correct answer.

Explanation:

When a linear chain of carbon and hydrogen atoms is attached by single bonds only then it is known as alkane.

When  a linear chain of carbon and hydrogen atoms contains a double bond then it is known as alkene.

When  a linear chain of carbon and hydrogen atoms contains a triple bond then it is known as alkyne.

Therefore, in the given description there is a double bond between third and fourth carbon. Hence, the IUPAC name of given compound is 3-heptene.

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