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

The major product of the following reaction is

Identify the compounds A and B in the following reaction sequence.
${\mathrm{CaC}}_2$ (s) + ${\mathrm{H}}_2\mathrm{O}$ (l)  $\to$ A (g) $\frac{{\mathrm{H}}_2{\mathrm{SO}}_4}{{\mathrm{HgSO}}_4}\to$B (l)

Identify the compound B in the reaction given below.

${\mathrm{CH}}_3-\mathrm{CH}-{\mathrm{Cl}}_2\frac{2\mathrm{mole}}{{\mathrm{NaNH}}_2}\overline{)\mathrm{A}}\stackrel{{\mathrm{AsCl}}_3}{⟶}\overline{)\mathrm{B}}$

Hydrolysis of which of the following carbides produce propyne?

A colourless gas is produced when metallic carbide undergoes treatment with water, which burns readily in air and gives a precipitate with ammoniacal silver nitrate solution. The gas evolved is:

A metallic carbide on reaction with water gives a colourless gas, which burns readily in air and gives a precipitate with ammonical silver nitrate solution. What is the gas evolved in reaction?

Which of the following reactions yields ethyne gas?

In which of the following reactions, acetylene gas will not be liberated?

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

$\mathrm{x} \text{and} \mathrm{y} \text{mole}$ consumed. Find the value of $\mathrm{x} + \mathrm{y}$?

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'?

${\mathrm{CaCO}}_3\left(\mathrm{s}\right)\stackrel{\mathrm{Heat}}{\to }\mathrm{ }\mathrm{X}\left(\mathrm{s}\right)+\mathrm{Z}\left(\mathrm{g}\right)$

$\mathrm{X}\left(\mathrm{s}\right)\stackrel{\mathrm{Carbon}, \mathrm{heat}}{\to }\mathrm{ }\mathrm{C}\left(\mathrm{s}\right)+\mathrm{D}\left(\mathrm{g}\right)$

$\mathrm{C}\left(\mathrm{s}\right)+{\mathrm{H}}_2\mathrm{O}\to \mathrm{E}\left(\mathrm{g}\right).$

What is E and C respectively ?

Which of the following carbides produces propyne on reaction with water ?

The carbide which reacts with water to form ethyne is

${\mathrm{CaC}}_2+{\mathrm{H}}_2\mathrm{O}\to \mathrm{X}\stackrel{{\mathrm{O}}_3/{\mathrm{H}}_2\mathrm{O}\mathrm{ }}{\to }\mathrm{HCOOH}+\mathrm{HCOOH}$

$\mathrm{X}\mathrm{ }\mathrm{is}$

Aqueous solution of an organic compound $\mathrm{A}$ on electrolysis liberates acetylene and $\mathrm{C}{\mathrm{O}}_2$ at anode. $\mathrm{A}$ is: