what is the value of n in ch₃(ch₂)ₙch₃ if the name of the hydrocarbon is heptane?\n2\n5\n7\n8

Explanation:

Step1: Recall heptane's carbon - atom count

Heptane has 7 carbon atoms.

Step2: Analyze the structure formula

In $CH_3(CH_2)_nCH_3$, the two terminal $CH_3$ groups contribute 2 carbon atoms. The $(CH_2)_n$ part contributes $n$ carbon - atom pairs. So the total number of carbon atoms is $2 + n$.

Step3: Set up an equation

We know that the total number of carbon atoms in heptane is 7. So we set up the equation $2 + n=7$.

Step4: Solve the equation

Subtract 2 from both sides of the equation: $n=7 - 2$. $n = 5$

Answer:

B. 5