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

Answer:

B. 5

Explanation:

Step1: Recall heptane's carbon - count

Heptane has 7 carbon atoms.

Step2: Analyze the given 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 - atoms from the $CH_2$ units. So, $2 + n=7$.

Step3: Solve for n

Subtract 2 from both sides of the equation $2 + n=7$. We get $n=7 - 2=5$.