How many litres of ethene is required to prepare 90 gm of ethane by the following method at STP.

Engineering

Chemistry

Preparation of Alkyl Halide

Reactions of Organometallic Compound Grignard Reagents

Question

How many litres of ethene is required to prepare 90 gm of ethane by the following method at STP.
${CH}_{2} = C H_{2} \overset{HCl}{\to} P_{1} \to_{{Et}_{2} O}^{Mg} P_{2} \to_{}^{HCl} EtH (Ethane)$

44.8 litres

22.4 litres

6.72 litres

None of these

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${CH}_{2} = C H_{2} \overset{HCl}{\to} {CH}_{3} - {CH}_{2} Cl \to_{{Et}_{2} O}^{Mg} {CH}_{3} {CH}_{2} MgCl \to_{}^{HCl} {CH}_{3} {CH}_{3}$
Moles of ethane $= \frac{weight}{M . weight} = \frac{90}{30} = 3 moles$
3 moles ethene will yield 3 moles of ethane
volume of ethene at STP = 3 × 22.4 = 67.2 litre