What is the correct $I.U.P.A.C.$ name of the following compound?

The $IUPAC$ name of the compound $CH_2 = CH - CH(CH_3) - CH_3$ is

Expand each of the following condensed formulas into their complete structural formulas.
$(a)$ $CH_3-CH_2-CO-CH_2-CH_3$
$(b)$ $CH_3-CH=CH-CH_2-CH_2-CH_2-CH_3$

The $IUPAC$ name of the compound $CH_2=CH-CH_2-CH_2-C\equiv CH$ is

The structural formula of $2$-methyl-$2$-butene is

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 |