Ethyne on reaction with dil. $H_2SO_4$ and $Hg(II)$ gives:

The reaction $R-C \equiv C-R \xrightarrow{H_2 / \text{Lindlar's catalyst}}$ gives the major product as ..............

Which one of the following statements is false?

Explain the acidic nature of ethyne.

Assertion : Acetylene on treatment with alkaline $KMnO_4$ produces acetaldehyde.
Reason : Alkaline $KMnO_4$ is a reducing agent.

To convert $1$-butyne to $1-D$-butanal,one would carry out the following steps :
$(I)$ Sodium amide,then $D_2O$
$(II)$ Disiamylborane,then hydrogen peroxide/sodium hydroxide
$(III)$ The transformation can not be carried out with the indicated reagents.