Methods of Preparation of Alkynes

The reagent(s) for the following conversion,

$\mathrm{Br}-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\mathrm{Br} \stackrel{?}{\to } \mathrm{CH}\equiv \mathrm{CH}$

is/are

State the process used to synthesise acetylene using Berthelot's method.

Berthelot acetylene synthesis involves reaction between

Explain Berthelot's method to synthesise acetylene.

How will you prepare acetylene from iodoform?

The formation of acetylene from silver powder follows $\mathrm{\alpha }-$elimination.

What happens when iodoform is heated with silver powder.

When iodoform is heated with silver powder it forms ethyne as the major organic product.

How Berthelot was able to prepare acetylene gas?

When iodoform is heated with silver powder it forms:

When 2,2,3,3-tetrabromobutane reacts with zinc dust gives

${\mathrm{CH}}_3-{\mathrm{CBr}}_2-{\mathrm{CBr}}_2-{\mathrm{CH}}_3+2\mathrm{Zn}\to \mathrm{X}+2{\mathrm{ZnBr}}_2$

What is the product $\mathrm{X}$ in the above reaction.

Explain the preparation of alkynes from tetrahalides.

The reagent used in preparation method of alkynes from geminal dihalides is 

Explain the preparation method of alkynes from geminal dihalides.

The major product of the following reaction is

When $1, 2-$dibromoethane reacts with sodamide giving a product $\mathrm{X}$. The hybridisation state of the carbons present in it respectively, are

The major organic compound formed by the reaction of 1,1,1-Trichloroethane with silver power is

In the reaction,

How many electron donating groups are attached with the carbon atom of unsaturated part of the product 'B'?

Gem dihalides on treatment with alcoholic $\mathrm{KOH}$ gives: