Question

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

Answer 1

Answer: Option (3) is the correct answer.

Step-by-step 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.