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

Which of the following reacting substances will not liberate ethyne gas?

Which of the following reacting substances will not liberate ethyne gas?

Which of the following reaction do not give alkyne :-

Phosphine, Acetylene and Ammonia can be formed by treating water with :-

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.

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

What will be the product formed when ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CHCl}}_2$ is treated with ${\mathrm{NaNH}}_2$ ?

Hydrolysis of which of the following carbides produce propyne?

On reaction with water, a metal carbide gives a colourless gas which burns readily in air. This gas, when passed through an ammoniacal silver nitrate solution, forms a precipitate. Identify the evolved gas.

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:

When ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CHCl}}_2$ is treated with ${\mathrm{NaNH}}_2,$ the product $\mathrm{X}$ is formed. What will be the structure of $\mathrm{X}?$

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?

Calculate the weight of precipitate formed, when $90$ grams of vicinal tetra bromopropane reacted with ${\mathrm{NaNH}}_2$ to form alkyne, which then passes through ammonical ${\mathrm{AgNO}}_3$ solution.

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