Answer
410.1k+ views
Hint:We need to know the reactions which involve two molecules (as given in the options) and analyse each given reaction with chloroethane. We have to know that the propene is an alkene with a double bond and chloroethene is a haloalkene with a double bond. Hence it is clear that we need to know the formation of alkene from haloalkene. The haloalkene is allowed to react with another molecule to give propene hence it is known as bimolecular reaction or $Sn_2$ type of reaction. Also it involves chloroethene where Chlorine is a halogen and hence acts as a nucleophile. Also it involves substitution of the chlorine by ethene group hence it is a nucleophilic substitution ($Sn_2$) reaction.
Complete step by step answer:
Let us look at each of the given reactions one by one:
(A) $C{H_2} = CHCl + C{H_3}Cl\xrightarrow[{Heat}]{{Na/Ether}}$
In this reaction, two alkyl halides are allowed to react in Sodium and ether. This is the Wurtz reaction where two alkyl halides are reacted with sodium metal in dry ether solution to form a higher alkane. Hence propene cannot be formed in this reaction.
(B) \[C{H_2} = CHCl + {\left( {C{H_3}} \right)_2}CuLi \to \]
Clearly, this is the reaction of chloroethene with lithium dimethyl copper. Lithium dimethyl copper is also known as Gilman reagent. They react with organic halides to replace the halide group with an R group to give alkanes. In the above reaction propene is not produced. Therefore, the option B is incorrect.
(C) \[C{H_3}Cl + {\left( {C{H_2} = CHCl} \right)_2}CuLi \to \]
Chloroethene reacts with lithium dichloroethenyl cuprate by $Sn_2$ mechanism to give propene. The $Sn_2$ mechanism is a one-step process in which a nucleophile attacks the substrate, and a leaving group, L departs simultaneously. Cl of chloro acts as a nucleophile.
\[C{H_3}Cl + {\left( {C{H_2} = CHCl} \right)_2}CuLi \to C{H_3} - CH = C{H_2}\]
In the above reaction, propene is formed as a product. Therefore, the option C is correct.
(D) \[C{H_2} = CHCl + C{H_3}Li \to \]
This reaction gives Chloropropene and Li acts as a leaving group.
Hence the correct option is option (C).
Note:
We have to note that $Sn_2$ reactions occur most efficiently with $CH_3Cl$ since Cl acts as a strong nucleophile. $Sn_2$ reactions are bimolecular with simultaneous bond-making and bond-breaking steps. Identifying the structure of the molecule formed is also important. As in this case, we needed propene with a double bond. Chloroethene with lithium dimethyl copper gave propane which has a single bond. Therefore, keeping an eye on the bonding is also important and the mechanism involved in it must also be known.
Complete step by step answer:
Let us look at each of the given reactions one by one:
(A) $C{H_2} = CHCl + C{H_3}Cl\xrightarrow[{Heat}]{{Na/Ether}}$
In this reaction, two alkyl halides are allowed to react in Sodium and ether. This is the Wurtz reaction where two alkyl halides are reacted with sodium metal in dry ether solution to form a higher alkane. Hence propene cannot be formed in this reaction.
(B) \[C{H_2} = CHCl + {\left( {C{H_3}} \right)_2}CuLi \to \]
Clearly, this is the reaction of chloroethene with lithium dimethyl copper. Lithium dimethyl copper is also known as Gilman reagent. They react with organic halides to replace the halide group with an R group to give alkanes. In the above reaction propene is not produced. Therefore, the option B is incorrect.
(C) \[C{H_3}Cl + {\left( {C{H_2} = CHCl} \right)_2}CuLi \to \]
Chloroethene reacts with lithium dichloroethenyl cuprate by $Sn_2$ mechanism to give propene. The $Sn_2$ mechanism is a one-step process in which a nucleophile attacks the substrate, and a leaving group, L departs simultaneously. Cl of chloro acts as a nucleophile.
\[C{H_3}Cl + {\left( {C{H_2} = CHCl} \right)_2}CuLi \to C{H_3} - CH = C{H_2}\]
In the above reaction, propene is formed as a product. Therefore, the option C is correct.
(D) \[C{H_2} = CHCl + C{H_3}Li \to \]
This reaction gives Chloropropene and Li acts as a leaving group.
Hence the correct option is option (C).
Note:
We have to note that $Sn_2$ reactions occur most efficiently with $CH_3Cl$ since Cl acts as a strong nucleophile. $Sn_2$ reactions are bimolecular with simultaneous bond-making and bond-breaking steps. Identifying the structure of the molecule formed is also important. As in this case, we needed propene with a double bond. Chloroethene with lithium dimethyl copper gave propane which has a single bond. Therefore, keeping an eye on the bonding is also important and the mechanism involved in it must also be known.
Recently Updated Pages
Mark and label the given geoinformation on the outline class 11 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
When people say No pun intended what does that mea class 8 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Name the states which share their boundary with Indias class 9 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Give an account of the Northern Plains of India class 9 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Change the following sentences into negative and interrogative class 10 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Advantages and disadvantages of science
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Trending doubts
Bimbisara was the founder of dynasty A Nanda B Haryanka class 6 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Which are the Top 10 Largest Countries of the World?
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
10 examples of evaporation in daily life with explanations
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Give 10 examples for herbs , shrubs , climbers , creepers
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
How do you graph the function fx 4x class 9 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference Between Plant Cell and Animal Cell
![arrow-right](/cdn/images/seo-templates/arrow-right.png)