MCQ
Ethylene is prepared by:
- ADehalogenation of chloroform.
- BPyrolysis of ethane at 450°C
- CDehydration of methanol with Al2O3/350°C
- DMethyl chloride on reduction
Explanation:
Decomposition of the compound by heat is called pyrolysis or thermal decomposition.
When Ethane is heated in absence of air at 450°C gives Ethylene and Hydrogen.
CH3−CH3 $\xrightarrow{450°\text{C}}$ CH2 = CH2 + H2
When Alkanes are heated to high temperature in absence of air, the higher alkane molecules break up into smaller molecules of lower alkanes, alkanes, and hydrogen.
Remaining all reactions gives alkanes.
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$\text{Zn}+2\text{HCl}\xrightarrow{ \ \ \ \ \ \ \ }\text{ZnCl}_2+\text{H}_2$