The $IUPAC$ name of the following compound is

Give the structural formula of the following:
$(i)$ Ethyne
$(ii)$ Ethanenitrile
$(iii)$ Ethanoyl chloride
$(iv)$ Ethyl ethanoate

According to Cahn-Ingold-Prelog sequence rules,the correct order of priority for the given groups is

What is the correct $IUPAC$ name for $CH_3-CH(CH_3)-CH=CH-CH_2-COOH$?

Match the structures given in Column-$I$ with their $\text{IUPAC}$ names in Column-$II$.
| Column-$I$ (Structure) | Column-$II$ ($\text{IUPAC}$ Name) |
| :--- | :--- |
| $(A)$ Cyclohexanol | $(i)$ $2$-ethoxy-$1,1$-dimethylcyclohexane |
| $(B)$ $2$-methylcyclopentanol | (ii) $3$-methylphenol |
| $(C)$ $3$-methylphenol | (iii) Trihydroxybenzene |
| $(D)$ $1$-ethoxy-$2,2$-dimethylcyclohexane | (iv) $2$-methylcyclopentanol |
| $(E)$ Benzene-$1,2,4$-triol | $(v)$ Cyclohexanol |
| | (vi) Benzene-$1,2,4$-triol |

Which of the following molecules does not contain a chiral carbon?