Question

question
what is the condensed formula notation for 4 - decyne?
select the correct answer below:
○ ch₃ch₂ch₂c≡cch₂ch₂ch₂ch₃
○ ch₃ch₂ch₂c≡cch₂ch₂ch₂ch₂ch₃
○ ch₃ch₂ch₂c≡ch₂ch₂ch₂ch₂ch₃
○ ch₃ch₂ch₂c≡cch₂ch₂ch₂ch₂ch₂ch₃

Explanation:

Step1: Understand decyne structure

Dec - means 10 carbon atoms, - yne means a triple - bond.

Step2: Locate triple - bond position

4 - decyne has the triple - bond at the 4th carbon position.

Step3: Write condensed formula

Starting from one end, we have three $\mathrm{CH_2}$ groups before the triple - bond carbon, then the triple - bond, and then four $\mathrm{CH_2}$ groups and a $\mathrm{CH_3}$ group at the other end, giving $\mathrm{CH_3CH_2CH_2C\equiv CCH_2CH_2CH_2CH_3}$.

Answer:

A. $\mathrm{CH_3CH_2CH_2C\equiv CCH_2CH_2CH_2CH_3}$