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Chemical Properties of Alkanes

Cracking of E...

Question

Cracking of Ethane gives a mixture of

A

Ethene and H₂

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B

Ethene, Methane and H₂

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C

H2 and methane

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D

Only CH4

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Solution

The correct option is B
Ethene, Methane and H₂

$C H_{3} C H_{3} ⟶ 2 \cdot C H_{3} (i n i t i a t i o n)$

$C H_{3} C H_{3} + \cdot C H_{3} ⟶ C H_{4} + C H_{3} \cdot C H_{2} (m e t h a n e)$

Radical decomposition:

$C H_{3} \cdot C H_{2} ⟶ C H_{2} = C H_{2} + \cdot H (E t h e n e)$

$\cdot H + \cdot H ⟶ H_{2} (H y d r o g e n)$

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Similar questions

Q. Classify into alkanes, alkenes and alkynes :

Ethane, ethene, methane, ethyne, propene, propyne

Q. A gaseous mixture of ethene, ethane and methane having total volume

150 m l

is subjected to combustion in excess of oxygen. If percentage of methane in the original mixture is

20 %

then calculate volume (in ml) of

C O_{2} (g)

which will be obtained at same temperature and pressure.

Q. Calculate the molecular masses of the following compounds :
(a) Methane, CH₄
(b) Ethane, C₂H₆
(c) Ethene, C₂H₄
(d) Ethyne, C₂H₂

(Atomic masses : C = 12 u ; H = 1 u)

Q. Methane is a saturated hydrocarbon while ethene and ethyne are unsaturated hydrocarbons.

Q. Ethene when heated with conc.

H_{2} {S O}_{4}

and water dilution gives:

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