Which of the following is a heterocyclic compound?

Number of $3°$ and $2°$ carbon atoms in the following compound are:

Match List $\mathrm{I}$ with List $\mathrm{II}$ by choosing the correct word root and select the correct answer using code given below the lists: 

Give the lUPAC name of the following compound.

${\mathrm{CH}}_3-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}={\mathrm{CH}}_2$

Write down the bond line structure of the following:

$2, 4-$hexa-di-yne.

Write the common names of the following:

Write the common names of the following:

Write the structure of the following compound: Ethylacetylene