90960
Reaction of methyl bromide with aqueous sodium hydroxide involves
1 racemisation
2 $\mathrm{S}_{\mathrm{N}} 1$ mechanism
3 retention of configuration
4 $\mathrm{S}_{\mathrm{N}} 2$ mechanism
Explanation:
Since, the reaction rate depends upon the concentration of both reactant and nucleophile, it is a $\mathrm{S}_{\mathrm{N}} 2$ reaction. It involves inversion of configuration.
**[Karnataka CET
HALOALKANES AND HALOARENES
90962
Following reaction, $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CBr}+\mathrm{H}_{2} \mathrm{O} \rightarrow\left(\mathrm{CH}_{3}\right)_{3} \mathrm{COH}+\mathrm{HBr}$ is an example of
1 elimination reaction
2 free radical substitution
3 nucleophilic substitution
4 electrophilic substitution
Explanation:
$\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CBr}+\mathrm{H}_{2} \mathrm{O} \rightarrow\left(\mathrm{CH}_{3}\right)_{3} \mathrm{COH}+\mathrm{HBr}$ $\mathrm{Br}$ is substituted by $-\mathrm{OH}$ (nucleophile) $\mathrm{S}_{\mathrm{N}} 1$ (Unimolecular substitution reaction)
**[MHT CET-2008]**
HALOALKANES AND HALOARENES
90965
Ethyl bromide is industrially prepared from
1 ethyl alcohol $+\mathrm{HBr}$
2 ethanol $+\mathrm{Br}_{2}$
3 alcohol $+\mathrm{HBr}$
4 None of the above
Explanation:
Ethyl bromide can prepared at large scale by industrial process. Industrial preparation of ethyl bromide. By refluxing the alchohol with constant boiling $\mathrm{HBr}$ $(48 \%)$ in presence of little concentrated sulphuric acid.
**[UP CPMT-2007]**
HALOALKANES AND HALOARENES
90967
The ease of dehydrohalogenation of alkyl halide with alcoholic $\mathrm{KOH}$ is
1 $3^{\circ}<2^{\circ}<1^{\circ}$
2 $3^{\circ}>2^{\circ}>1^{\circ}$
3 $3^{\circ}<2^{\circ}>1^{\circ}$
4 $3^{\circ}>2^{\circ}<1^{\circ}$
Explanation:
Any alkyl halide that gives a more highly substituted (more stable) alkene undergoes dehydrohalogenation faster than the one which gives a less highly substituted (less stable ) alkene. $3^{\circ}>2^{\circ}>1^{\circ}$
90960
Reaction of methyl bromide with aqueous sodium hydroxide involves
1 racemisation
2 $\mathrm{S}_{\mathrm{N}} 1$ mechanism
3 retention of configuration
4 $\mathrm{S}_{\mathrm{N}} 2$ mechanism
Explanation:
Since, the reaction rate depends upon the concentration of both reactant and nucleophile, it is a $\mathrm{S}_{\mathrm{N}} 2$ reaction. It involves inversion of configuration.
**[Karnataka CET
HALOALKANES AND HALOARENES
90962
Following reaction, $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CBr}+\mathrm{H}_{2} \mathrm{O} \rightarrow\left(\mathrm{CH}_{3}\right)_{3} \mathrm{COH}+\mathrm{HBr}$ is an example of
1 elimination reaction
2 free radical substitution
3 nucleophilic substitution
4 electrophilic substitution
Explanation:
$\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CBr}+\mathrm{H}_{2} \mathrm{O} \rightarrow\left(\mathrm{CH}_{3}\right)_{3} \mathrm{COH}+\mathrm{HBr}$ $\mathrm{Br}$ is substituted by $-\mathrm{OH}$ (nucleophile) $\mathrm{S}_{\mathrm{N}} 1$ (Unimolecular substitution reaction)
**[MHT CET-2008]**
HALOALKANES AND HALOARENES
90965
Ethyl bromide is industrially prepared from
1 ethyl alcohol $+\mathrm{HBr}$
2 ethanol $+\mathrm{Br}_{2}$
3 alcohol $+\mathrm{HBr}$
4 None of the above
Explanation:
Ethyl bromide can prepared at large scale by industrial process. Industrial preparation of ethyl bromide. By refluxing the alchohol with constant boiling $\mathrm{HBr}$ $(48 \%)$ in presence of little concentrated sulphuric acid.
**[UP CPMT-2007]**
HALOALKANES AND HALOARENES
90967
The ease of dehydrohalogenation of alkyl halide with alcoholic $\mathrm{KOH}$ is
1 $3^{\circ}<2^{\circ}<1^{\circ}$
2 $3^{\circ}>2^{\circ}>1^{\circ}$
3 $3^{\circ}<2^{\circ}>1^{\circ}$
4 $3^{\circ}>2^{\circ}<1^{\circ}$
Explanation:
Any alkyl halide that gives a more highly substituted (more stable) alkene undergoes dehydrohalogenation faster than the one which gives a less highly substituted (less stable ) alkene. $3^{\circ}>2^{\circ}>1^{\circ}$
90960
Reaction of methyl bromide with aqueous sodium hydroxide involves
1 racemisation
2 $\mathrm{S}_{\mathrm{N}} 1$ mechanism
3 retention of configuration
4 $\mathrm{S}_{\mathrm{N}} 2$ mechanism
Explanation:
Since, the reaction rate depends upon the concentration of both reactant and nucleophile, it is a $\mathrm{S}_{\mathrm{N}} 2$ reaction. It involves inversion of configuration.
**[Karnataka CET
HALOALKANES AND HALOARENES
90962
Following reaction, $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CBr}+\mathrm{H}_{2} \mathrm{O} \rightarrow\left(\mathrm{CH}_{3}\right)_{3} \mathrm{COH}+\mathrm{HBr}$ is an example of
1 elimination reaction
2 free radical substitution
3 nucleophilic substitution
4 electrophilic substitution
Explanation:
$\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CBr}+\mathrm{H}_{2} \mathrm{O} \rightarrow\left(\mathrm{CH}_{3}\right)_{3} \mathrm{COH}+\mathrm{HBr}$ $\mathrm{Br}$ is substituted by $-\mathrm{OH}$ (nucleophile) $\mathrm{S}_{\mathrm{N}} 1$ (Unimolecular substitution reaction)
**[MHT CET-2008]**
HALOALKANES AND HALOARENES
90965
Ethyl bromide is industrially prepared from
1 ethyl alcohol $+\mathrm{HBr}$
2 ethanol $+\mathrm{Br}_{2}$
3 alcohol $+\mathrm{HBr}$
4 None of the above
Explanation:
Ethyl bromide can prepared at large scale by industrial process. Industrial preparation of ethyl bromide. By refluxing the alchohol with constant boiling $\mathrm{HBr}$ $(48 \%)$ in presence of little concentrated sulphuric acid.
**[UP CPMT-2007]**
HALOALKANES AND HALOARENES
90967
The ease of dehydrohalogenation of alkyl halide with alcoholic $\mathrm{KOH}$ is
1 $3^{\circ}<2^{\circ}<1^{\circ}$
2 $3^{\circ}>2^{\circ}>1^{\circ}$
3 $3^{\circ}<2^{\circ}>1^{\circ}$
4 $3^{\circ}>2^{\circ}<1^{\circ}$
Explanation:
Any alkyl halide that gives a more highly substituted (more stable) alkene undergoes dehydrohalogenation faster than the one which gives a less highly substituted (less stable ) alkene. $3^{\circ}>2^{\circ}>1^{\circ}$
90960
Reaction of methyl bromide with aqueous sodium hydroxide involves
1 racemisation
2 $\mathrm{S}_{\mathrm{N}} 1$ mechanism
3 retention of configuration
4 $\mathrm{S}_{\mathrm{N}} 2$ mechanism
Explanation:
Since, the reaction rate depends upon the concentration of both reactant and nucleophile, it is a $\mathrm{S}_{\mathrm{N}} 2$ reaction. It involves inversion of configuration.
**[Karnataka CET
HALOALKANES AND HALOARENES
90962
Following reaction, $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CBr}+\mathrm{H}_{2} \mathrm{O} \rightarrow\left(\mathrm{CH}_{3}\right)_{3} \mathrm{COH}+\mathrm{HBr}$ is an example of
1 elimination reaction
2 free radical substitution
3 nucleophilic substitution
4 electrophilic substitution
Explanation:
$\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CBr}+\mathrm{H}_{2} \mathrm{O} \rightarrow\left(\mathrm{CH}_{3}\right)_{3} \mathrm{COH}+\mathrm{HBr}$ $\mathrm{Br}$ is substituted by $-\mathrm{OH}$ (nucleophile) $\mathrm{S}_{\mathrm{N}} 1$ (Unimolecular substitution reaction)
**[MHT CET-2008]**
HALOALKANES AND HALOARENES
90965
Ethyl bromide is industrially prepared from
1 ethyl alcohol $+\mathrm{HBr}$
2 ethanol $+\mathrm{Br}_{2}$
3 alcohol $+\mathrm{HBr}$
4 None of the above
Explanation:
Ethyl bromide can prepared at large scale by industrial process. Industrial preparation of ethyl bromide. By refluxing the alchohol with constant boiling $\mathrm{HBr}$ $(48 \%)$ in presence of little concentrated sulphuric acid.
**[UP CPMT-2007]**
HALOALKANES AND HALOARENES
90967
The ease of dehydrohalogenation of alkyl halide with alcoholic $\mathrm{KOH}$ is
1 $3^{\circ}<2^{\circ}<1^{\circ}$
2 $3^{\circ}>2^{\circ}>1^{\circ}$
3 $3^{\circ}<2^{\circ}>1^{\circ}$
4 $3^{\circ}>2^{\circ}<1^{\circ}$
Explanation:
Any alkyl halide that gives a more highly substituted (more stable) alkene undergoes dehydrohalogenation faster than the one which gives a less highly substituted (less stable ) alkene. $3^{\circ}>2^{\circ}>1^{\circ}$
