Which one of the following carbonyl compounds cannot be prepared by addition of water on an alkyne in the presence of $HgSO_4$ and $H_2SO_4$?

Which of the following organic compounds has the same hybridization as its combustion product $(CO_2)$?

Which reacts with ammoniacal $AgNO_3$?

The reagent used in the reaction $R-CH_2-CCl_2-R \xrightarrow{\text{Reagent}} R-C \equiv C-R$ is .............

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

If acetylene is passed through an electric arc in the atmosphere of nitrogen,the compound formed is