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Question

Alkane is obtained from the reaction of which of the following compounds with Grignard reagent?


A

NH3

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B

H2O

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C

C2H5OH

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D

All of these

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Solution

The correct option is D

All of these


The explanation for the correct option:

  • Grignard reagent: These are the organometallic compounds commonly represented by the general formula R-Mg-X in which R is a hydrocarbon radical (CH3,C2H5,C6H5,etc.) and X is a halogen atom.
  • Examples of Grignard reagents are Methylmagnesium chloride (CH3MgCl), Phenylmagnesium bromide (C6H5MgBr), etc.
  • Alkanes are saturated hydrocarbons containing carbon-carbon single bonds in them.
  • The reaction of the Grignard reagent with the given compounds are:

(a)NH3(aq)+RMgX(aq)→RH(aq)+Mg(NH2)X(aq)(ammonia)(grignardreagent)(alkane)(b)H2O(aq)+RMgX(aq)→RH(aq)+Mg(OH)X(aq)(water)(grignardreagent)(alkane)(c)C2H5OH(aq)+RMgX(aq)→RH(aq)+Mg(OC2H5)X(aq)(ethanol)(grignardreagent)(alkane)

  • In all the above reactions, alkane (RH) is formed.

Hence, the correct option is (D).


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