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What is the nature of the carbon-magnesium bond in a Grignard reagent ($RMgX$)?
The NCERT text explicitly states, 'In the Grignard reagent, the carbon-magnesium bond is covalent but highly polar, with carbon pulling electrons from electropositive magnesium; the magnesium halogen bond is essentially ionic.'
Which of the following statements about Grignard reagents is INCORRECT?
The NCERT states, 'In the Grignard reagent, the carbon-magnesium bond is covalent but highly polar'. The statement that it is 'primarily ionic' is incorrect; the magnesium-halogen bond is essentially ionic.
Which of the following compounds would be formed when methylmagnesium iodide ($CH_3MgI$) reacts with heavy water ($D_2O$)?
Grignard reagents react with any source of proton (or deuteron in this case) to give hydrocarbons. $CH_3MgI$ will abstract a deuteron from $D_2O$ to form $CH_3D$ (deutero-methane), and not methane or iodomethane. The NCERT implies this by stating 'react with any source of proton to give hydrocarbons'.
What is the primary product formed when an alkyl halide reacts with sodium in dry ether during Wurtz reaction?
The NCERT states, 'Alkyl halides react with sodium in dry ether to give hydrocarbons containing double the number of carbon atoms present in the halide. This reaction is known as Wurtz reaction.'
In Wurtz reaction, if $CH_3Br$ is reacted with sodium in dry ether, what will be the major organic product?
According to the Wurtz reaction, alkyl halides form hydrocarbons with double the number of carbon atoms. If methyl bromide ($CH_3Br$) is used, the product will have $1 imes 2 = 2$ carbon atoms, which corresponds to ethane ($CH_3CH_3$). The NCERT defines the Wurtz reaction as giving 'hydrocarbons containing double the number of carbon atoms present in the halide'.
Which metal is typically used in the Wurtz reaction?
The NCERT text specifies, 'Alkyl halides react with sodium in dry ether to give hydrocarbons... This reaction is known as Wurtz reaction.'
The Wurtz-Fittig reaction involves the reaction of a mixture of:
The NCERT defines Wurtz-Fittig reaction as: 'A mixture of an alkyl halide and aryl halide gives an alkylarene when treated with sodium in dry ether and is called Wurtz-Fittig reaction.'
What is the product of the Fittig reaction?
The NCERT states, 'Aryl halides also give analogous compounds when treated with sodium in dry ether, in which two aryl groups are joined together. It is called Fittig reaction.'
Why is it necessary to avoid even traces of moisture when working with Grignard reagents?
The NCERT highlights this: 'Grignard reagents are highly reactive and react with any source of proton to give hydrocarbons. Even water, alcohols, amines are sufficiently acidic to convert them to corresponding hydrocarbons. It is therefore necessary to avoid even traces of moisture from a Grignard reagent.'
Which of the following is an organometallic compound?
The NCERT defines organometallic compounds as 'compounds containing carbon-metal bonds'. $CH_3MgBr$ (a Grignard reagent) has a carbon-magnesium bond, making it an organometallic compound.
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