Hydration of propyne results in the formation of.......

$CH_{3}-C \equiv CH$ $\xrightarrow{2 HBr}$ $\xrightarrow{H_{2}O} \text{Product}$. The product is:

Which is the most suitable reagent among the following to distinguish compound $(iii)$ from the rest of the compounds?
$(i)$ $CH_3-C\equiv C-CH_3$
$(ii)$ $CH_3-CH_2-CH_2-CH_3$
$(iii)$ $CH_3-CH_2-C\equiv CH$
$(iv)$ $CH_3-CH=CH_2$

Which of the following contains acidic hydrogen?

What is the major product of the following reaction? $CH_3-C \equiv C-CH_2-CH_3 \xrightarrow{1 \ mol \ of \ Cl_2} \text{?}$

Write the following reaction:
$1$. Ozonolysis of ethyne.