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प्रश्न
Ethylene chloride and ethylidene chloride are isomers. Identify the correct statements.
(i) Both the compounds form same product on treatment with alcoholic KOH.
(ii) Both the compounds form same product on treatment with aq.NaOH.
(iii) Both the compounds form same product on reduction.
(iv) Both the compounds are optically active.
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उत्तर
(i) Both the compounds form same product on treatment with alcoholic KOH.
(iii) Both the compounds form same product on reduction.
Explanation:
\[\ce{\underset{(ethylidence chloride)}{H3C - CHCl2}}\] and \[\begin{array}{cc}
\phantom{}\ce{H2C - CH2}\phantom{}\\
\phantom{}|\phantom{....}|\\
\phantom{.}\ce{\underset{(ethylene dichloride)}{\phantom{}Cl\phantom{...}Cl}}\phantom{}
\end{array}\] are isomers.
(i) They give ethyne on treatment with alcoholic KOH.
\[\ce{CH3CHCl2 ->[alc][KOH] CH ≡ CH + 2KCl + 2H2O}\]
\[\ce{Cl - CH2 - CH2 - Cl ->[alc.KOH] CH ≡ CH + 2KCl + H2O}\]
(ii) On reduction with Zn dust in alcohol they give ethylene.
\[\ce{CH3CHCl2 + Zn ->[CH3OH] CH2 ≡ CH}\]
\[\ce{Cl - CH2 - CH2 - Cl + Zn ->[CH3OH] CH2 = CH2}\]
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संबंधित प्रश्न
Write the main products when methyl chloride is treated with AgCN.
Which would undergo SN2 reaction faster in the following pair and why ?
Write the structure of the major product in each of the following reaction :
Write the structures of A, B and C in the following:
Out of C6H5CH2Cl and C6H5CHClC6H5, which is more easily hydrolysed by aqueous KOH.
What happens when ethyl chloride is treated with aqueous KOH?
Which of the following pairs is/are correctly matched?
| Reaction | Product | |
| I | RX + AgCN | RNC |
| II | RX + KCN | RCN |
| III | RX + KNO2 | \[\begin{array}{cc} \phantom{.......}\ce{O}\\ \phantom{.....}/\\ \ce{R - N}\phantom{....}\\ \phantom{.....}\backslash\backslash\\ \phantom{.......}\ce{O} \end{array}\] |
| IV | RX + AgNO2 | \[\ce{R-O-N=O}\] |
The order of reactivity of the given haloalkanes towards nucleophile is:
Optically active isomers but not mirror images are called ____________.
Tertiary alkyl halides are practically inert to substitution by SN2 mechanism because of ____________.
The increasing order of reactivity towards SN1 mechanism is:
(I) \[\begin{array}{cc}
\ce{CH3-CH-CH2-CH3}\\
|\phantom{........}\\
\ce{CH3}\phantom{.....}
\end{array}\]
(II) CH3CH2CH2Cl
(III) P–CH3O–C6H4–CH2Cl
Which of the following statements are correct about this reaction?
(i) The given reaction follows SN2 mechanism.
(ii) (b) and (d) have opposite configuration.
(iii) (b) and (d) have same configuration.
(iv) The given reaction follows SN1 mechanism.
Which of the following statements are correct about the kinetics of this reaction?
(i) The rate of reaction depends on the concentration of only (b).
(ii) The rate of reaction depends on concentration of both (a) and (b).
(iii) Molecularity of reaction is one.
(iv) Molecularity of reaction is two.
Compound ‘A’ with molecular formula \[\ce{C4H9Br}\] is treated with aq. \[\ce{KOH}\] solution. The rate of this reaction depends upon the concentration of the compound ‘A’ only. When another optically active isomer ‘B’ of this compound was treated with aq. \[\ce{KOH}\] solution, the rate of reaction was found to be dependent on concentration of compound and \[\ce{KOH}\] both.
(i) Write down the structural formula of both compounds ‘A’ and ‘B’.
(ii) Out of these two compounds, which one will be converted to the product with inverted configuration.
Aryl halides are extremely less reactive towards nucleophilic substitution. Predict and explain the order of reactivity of the following compounds towards nucleophilic substitution:
| (I) |  |
| (II) |  |
| (III) |  |
Match the reactions given in Column I with the types of reactions given in Column II.
| Column I | Column II | |
| (i) |  |
(a) Nucleophilic aromatic substitution |
| (ii) | \[\begin{array}{cc} \ce{CH3 - CH = CH2 + HBr -> CH3 - CH - CH3}\\ \phantom{............................}|\phantom{}\\ \phantom{.............................}\ce{Br}\phantom{} \end{array}\] |
(b) Electrophilic aromatic substitution |
| (iii) |  |
(c) Saytzeff elimination |
| (iv) |  |
(d) Electrophilic addition |
| (v) | \[\begin{array}{cc} \ce{CH3 CH2 CH CH3 ->[alc.KOH] CH3 CH = CH CH3}\\ \phantom{}|\phantom{..........................}\\ \phantom{}\ce{Br}\phantom{........................} \end{array}\] |
(e) Nucleophilic substitution (SN1) |
Which of the following is the definition of chirality?
The decreasing order of reactivity of the following compounds towards nucleophilic substitution (SN2) is ______.
Assertion (A): 
undergoes SN2 reactions faster than 
.
Reason (R): Iodine is a better leaving group because of its large size.
In the light of the above statements, choose the correct answer from the options given below:
