Question

Impure acetylene has pleasant smell and pure acetylene has garlic odour.
$\left( A \right)$ True
$\left( B \right)$ False

Answer 1

Acetylene is an organic compound with formula ${C_2}{H_2}$ . It is a hydrocarbon and the simplest form of alkyne. Acetylene is a colorless gas that is widely used as a fuel. It is unstable in its pure form and thus it is usually handled as a solution

Complete step by step answer:
Interesting fact about acetylene
Acetylene and oxygen together produce a flame temperature which makes it the hottest fuel gases and this is the only fuel that can weld steel. Acetylene gas is lighter than air. Because of this unused gas will not gather in low areas and cause a potential hazard. It is the only fuel recommended for use underground working conditions. Acetylene is insoluble in water but soluble in non polar solvents like cyclohexane.
Impure acetylene gas contains impurities such as phosphine, hydrogen, sulfide and ammonia which are responsible for garlic odor in impure acetylene whereas in pure acetylene this type of impurities is not present so it has a pleasant smell.
Thus the given statement is false. So, the correct option is $B$ .

Additional information:
Uses of acetylene: It is used for welding purposes. The glass and materials processing industries also often use acetylene when carbon coating, because it provides a lubricated surface between two materials. The low moisture content of the gas makes it perfect for various industrial processes that demand critical heating

Note:
Acetylene gas is produced commercially through a reaction of water and calcium carbides. It is also a by-product of ethylene production, Acetylene gas may explode if it is compressed, liquefied and mixed with air.