Identify the reactant

The given compound is 1,1,1-trichloroethane.

Its structure is: $\mathrm{CH_3-CCl_3}$

Reaction with silver powder

Silver powder causes dehalogenation/coupling of polyhalogen compounds by removing halogen as silver halide.

For compounds of type $\mathrm{R-CCl_3}$, silver removes chlorine atoms and promotes coupling of two such units.

Write the overall transformation

Two molecules of $\mathrm{CH_3-CCl_3}$ combine, with removal of chlorine as $\mathrm{AgCl}$, to form an alkyne: $2\,\mathrm{CH_3CCl_3} + 6\,\mathrm{Ag} \rightarrow \mathrm{CH_3-C\equiv C-CH_3} + 6\,\mathrm{AgCl}$

Identify the product

$\mathrm{CH_3-C\equiv C-CH_3}$ is 2-butyne.

Check options

• A: 2-Butyne $\rightarrow$ Correct
• B: 2-Butene $\rightarrow$ No, product is an alkyne, not an alkene
• C: Acetylene $\rightarrow$ No, carbon skeleton has 4 carbons
• D: Ethene $\rightarrow$ No, incorrect carbon count and unsaturation

Final answer

The major organic compound formed is: $\boxed{\text{2-Butyne}}$