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Assertion (A) The cleavage of C-O bond i...

Assertion (A) The cleavage of `C-O` bond in ethers takes place under drastic condition with excess hydrogen halides
Reason (R) Ethers are the most reactive among all the functional groups.

A

Both A and R are correct and R is the correct explanation of A

B

Both A and R are correct but R is not the correct explanation of A

C

A is correct but R is incorrect

D

R is correct but A is incorrect

Text Solution

Verified by Experts

The correct Answer is:
C
Ethers are the least reactive among all the functional groups. The cleavage of `C-O` bond in ethers takes place under drastic conditions with excess of hydrogen halides.
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Carbon-oxygent bond in ethers can be cleaved b halogen acids, sulphuric acid, phosphorus pentachlodie, etc. The cleavage of C-O bond take place under drastic conditions with excess of hydrogen halides. R-O-R+2HX rarr 2RX +H_(2)O If hydrogen halide is not taken in excess then a molecule of alcohol and alkyl halide are formed. R-O-R+HI overset(373K) (rarr) R-OH+R-I The order of reactivity of hydrogen halides towards the given reaction depends on the bond strength of halogenated acids, weaker is the H-X bond, greter is its reactivity. In case of unsymmetrical ethers, the site of cleavage is such that the halide is formed from the alkyl group which is smaller in size. However, when one of the alkyl group is tertiary, the halide formed is the tertiary halide. Indiate wheterh the following statements // reactions are true or false. Hydrogen fluoride (HF) is not effective in ether cleavage. (a) True (b) False

Carbon-oxygent bond in ethers can be cleaved b halogen acids, sulphuric acid, phosphorus pentachlodie, etc. The cleavage of C-O bond take place under drastic conditions with excess of hydrogen halides. R-O-R+2HX rarr 2RX +H_(2)O If hydrogen halide is not taken in excess then a molecule of alcohol and alkyl halide are formed. R-O-R+HI overset(373K) (rarr) R-OH+R-I The order of reactivity of hydrogen halides towards the given reaction depends on the bond strength of halogenated acids, weaker is the H-X bond, greter is its reactivity. In case of unsymmetrical ethers, the site of cleavage is such that the halide is formed from the alkyl group which is smaller in size. However, when one of the alkyl group is tertiary, the halide formed is the tertiary halide. Indiate wheterh the following statements // reactions are true or false. Tertiar butyl methyl ether reacts with HI according to the following reaction. CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-OCH_(3)+HI rarr CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-OH+CH_(3)I (a) True (b) False

Carbon-oxygent bond in ethers can be cleaved b halogen acids, sulphuric acid, phosphorus pentachlodie, etc. The cleavage of C-O bond take place under drastic conditions with excess of hydrogen halides. R-O-R+2HX rarr 2RX +H_(2)O If hydrogen halide is not taken in excess then a molecule of alcohol and alkyl halide are formed. R-O-R+HI overset(373K) (rarr) R-OH+R-I The order of reactivity of hydrogen halides towards the given reaction depends on the bond strength of halogenated acids, weaker is the H-X bond, greter is its reactivity. In case of unsymmetrical ethers, the site of cleavage is such that the halide is formed from the alkyl group which is smaller in size. However, when one of the alkyl group is tertiary, the halide formed is the tertiary halide. Indiate wheterh the following statements // reactions are true or false. Alkyl aryl ethers react with HI to give phenol and alkyl halide. (a) True (b) False

Carbon-oxygent bond in ethers can be cleaved b halogen acids, sulphuric acid, phosphorus pentachlodie, etc. The cleavage of C-O bond take place under drastic conditions with excess of hydrogen halides. R-O-R+2HX rarr 2RX +H_(2)O If hydrogen halide is not taken in excess then a molecule of alcohol and alkyl halide are formed. R-O-R+HI overset(373K) (rarr) R-OH+R-I The order of reactivity of hydrogen halides towards the given reaction depends on the bond strength of halogenated acids, weaker is the H-X bond, greter is its reactivity. In case of unsymmetrical ethers, the site of cleavage is such that the halide is formed from the alkyl group which is smaller in size. However, when one of the alkyl group is tertiary, the halide formed is the tertiary halide. Indiate wheterh the following statements // reactions are true or false. The order of hydrogen halide reactivity is, HI lt HBr lt HCl . (a) True (b) False

Carbon-oxygent bond in ethers can be cleaved b halogen acids, sulphuric acid, phosphorus pentachlodie, etc. The cleavage of C-O bond take place under drastic conditions with excess of hydrogen halides. R-O-R+2HX rarr 2RX +H_(2)O If hydrogen halide is not taken in excess then a molecule of alcohol and alkyl halide are formed. R-O-R+HI overset(373K) (rarr) R-OH+R-I The order of reactivity of hydrogen halides towards the given reaction depends on the bond strength of halogenated acids, weaker is the H-X bond, greter is its reactivity. In case of unsymmetrical ethers, the site of cleavage is such that the halide is formed from the alkyl group which is smaller in size. However, when one of the alkyl group is tertiary, the halide formed is the tertiary halide. Indiate wheterh the following statements // reactions are true or false. Cyclic ethers are easily cleaved by HBr or HI to form dihaloalkanes. (a) True (b) False

Carbon-oxygent bond in ethers can be cleaved b halogen acids, sulphuric acid, phosphorus pentachlodie, etc. The cleavage of C-O bond take place under drastic conditions with excess of hydrogen halides. R-O-R+2HX rarr 2RX +H_(2)O If hydrogen halide is not taken in excess then a molecule of alcohol and alkyl halide are formed. R-O-R+HI overset(373K) (rarr) R-OH+R-I The order of reactivity of hydrogen halides towards the given reaction depends on the bond strength of halogenated acids, weaker is the H-X bond, greter is its reactivity. In case of unsymmetrical ethers, the site of cleavage is such that the halide is formed from the alkyl group which is smaller in size. However, when one of the alkyl group is tertiary, the halide formed is the tertiary halide. Indiate wheterh the following statements // reactions are true or false. In the reaction, R-O-R+HX rarr RX+ROH , oxonium [R-underset(H)underset(|)overset(+)(O)-R] ioin is formed as intermediate. (a) True (b) False

Cleavage Of C-O Bond In Ethers|Questions|Mechanism|Questions|Summary

Assertion (A): In case of haloarenes, electrophilic substitution reactions occur slowly and under drastic conditions. Reason (R): Haloarenes are activated as compared to benzene.