First slide

Alkynes

Question

Which of the following gas is used for welding purposes and can produce the highest heat of combustion?

Moderate

A

Ethane
B

Ethene
C

Ethyne
D

Methane

Solution

$2CH \equiv {CH + 5O}_{2} \overset{}{\to} {4CO}_{2} {+ 2H}_{2} O; ΔH = - 1300KJ$ ,
Combustion of Acetylene is extremely exothermic and the heat generated through the combustion can be used for welding.

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