231638
Consider the following isomeric butanes: What is the correct order of the above isomeric butanes of $\mathrm{S}_{\mathrm{N}_{2}}$ reaction?
1 $2>1>4>3$
2 $1>4>2>3$
3 $3>4>2>1$
4 $4>1>2>3$
Explanation:
As we know that, the order of reactivity of alkyl halide in $\mathrm{S}_{\mathrm{N}_{2}}$ reactions is: methyl $>1^{\circ}>2^{\circ}>3^{\circ}$. The $3^{\circ}$ alkyl halides are so crowded that they do not generally react by $\mathrm{S}_{\mathrm{N}_{2}}$ mechanism.
SCRA 2012
GENERAL ORGANIC CHEMISTRY
231655
Which of the following intermediate is not expected to be formed in the following reaction?
1
2
3
4
Explanation:
The intermediate is formed with following reaction is given as The possible intermediate is \(B C D\).
AIIMS 26 May 2019 (Morning)
GENERAL ORGANIC CHEMISTRY
231659
Assertion (A) $-\mathrm{NH}_{2}$ group of aniline is ortho, para directing in electrophilic substitutions. Reason (R) - $\mathrm{NH}_{2}$ group stabilises the arenium ion formed by the ortho, para attack of the electrophile. The correct answer is
1 Both (A) and (R) are correct, (R) is the correct explanation of $(\mathrm{A})$
2 Both (A) and (R) are correct, (R) is not the correct explanation of (A)
3 (A) is correct, but (R) is not correct
4 (A) is not correct, but (R) is correct
Explanation:
In aniline $-\mathrm{NH}_{2}$ group is a electron donar $(+\mathrm{M}$ effect). It show an ortho, para directing in electrophilic substitution. $-\mathrm{NH}_{2}$ group stablize the arenium ion formed by ortho, para attach of the electrophile.
AP EAMCET (Engg.) 2013
GENERAL ORGANIC CHEMISTRY
231661
Electrophilic substitution of compound $A$ will be fasted at position
1 1
2 2
3 3
4 4
Explanation:
$-\mathrm{I}$ effect of $-\mathrm{Cl}$ is stronger than $+\mathrm{R}$ effect, hence, it deactivates the ring towards electrophilic substitution. Thus, electrophilic substitution will be fastest at position 4 due to hyperconjugation and $+\mathrm{I}$ effect of $-\mathrm{CH}_{3}$ group. $\mathrm{CH}_{3}$-orthopara director \& activating group $\mathrm{Cl}$-orthopara director \& deactivating group
231638
Consider the following isomeric butanes: What is the correct order of the above isomeric butanes of $\mathrm{S}_{\mathrm{N}_{2}}$ reaction?
1 $2>1>4>3$
2 $1>4>2>3$
3 $3>4>2>1$
4 $4>1>2>3$
Explanation:
As we know that, the order of reactivity of alkyl halide in $\mathrm{S}_{\mathrm{N}_{2}}$ reactions is: methyl $>1^{\circ}>2^{\circ}>3^{\circ}$. The $3^{\circ}$ alkyl halides are so crowded that they do not generally react by $\mathrm{S}_{\mathrm{N}_{2}}$ mechanism.
SCRA 2012
GENERAL ORGANIC CHEMISTRY
231655
Which of the following intermediate is not expected to be formed in the following reaction?
1
2
3
4
Explanation:
The intermediate is formed with following reaction is given as The possible intermediate is \(B C D\).
AIIMS 26 May 2019 (Morning)
GENERAL ORGANIC CHEMISTRY
231659
Assertion (A) $-\mathrm{NH}_{2}$ group of aniline is ortho, para directing in electrophilic substitutions. Reason (R) - $\mathrm{NH}_{2}$ group stabilises the arenium ion formed by the ortho, para attack of the electrophile. The correct answer is
1 Both (A) and (R) are correct, (R) is the correct explanation of $(\mathrm{A})$
2 Both (A) and (R) are correct, (R) is not the correct explanation of (A)
3 (A) is correct, but (R) is not correct
4 (A) is not correct, but (R) is correct
Explanation:
In aniline $-\mathrm{NH}_{2}$ group is a electron donar $(+\mathrm{M}$ effect). It show an ortho, para directing in electrophilic substitution. $-\mathrm{NH}_{2}$ group stablize the arenium ion formed by ortho, para attach of the electrophile.
AP EAMCET (Engg.) 2013
GENERAL ORGANIC CHEMISTRY
231661
Electrophilic substitution of compound $A$ will be fasted at position
1 1
2 2
3 3
4 4
Explanation:
$-\mathrm{I}$ effect of $-\mathrm{Cl}$ is stronger than $+\mathrm{R}$ effect, hence, it deactivates the ring towards electrophilic substitution. Thus, electrophilic substitution will be fastest at position 4 due to hyperconjugation and $+\mathrm{I}$ effect of $-\mathrm{CH}_{3}$ group. $\mathrm{CH}_{3}$-orthopara director \& activating group $\mathrm{Cl}$-orthopara director \& deactivating group
231638
Consider the following isomeric butanes: What is the correct order of the above isomeric butanes of $\mathrm{S}_{\mathrm{N}_{2}}$ reaction?
1 $2>1>4>3$
2 $1>4>2>3$
3 $3>4>2>1$
4 $4>1>2>3$
Explanation:
As we know that, the order of reactivity of alkyl halide in $\mathrm{S}_{\mathrm{N}_{2}}$ reactions is: methyl $>1^{\circ}>2^{\circ}>3^{\circ}$. The $3^{\circ}$ alkyl halides are so crowded that they do not generally react by $\mathrm{S}_{\mathrm{N}_{2}}$ mechanism.
SCRA 2012
GENERAL ORGANIC CHEMISTRY
231655
Which of the following intermediate is not expected to be formed in the following reaction?
1
2
3
4
Explanation:
The intermediate is formed with following reaction is given as The possible intermediate is \(B C D\).
AIIMS 26 May 2019 (Morning)
GENERAL ORGANIC CHEMISTRY
231659
Assertion (A) $-\mathrm{NH}_{2}$ group of aniline is ortho, para directing in electrophilic substitutions. Reason (R) - $\mathrm{NH}_{2}$ group stabilises the arenium ion formed by the ortho, para attack of the electrophile. The correct answer is
1 Both (A) and (R) are correct, (R) is the correct explanation of $(\mathrm{A})$
2 Both (A) and (R) are correct, (R) is not the correct explanation of (A)
3 (A) is correct, but (R) is not correct
4 (A) is not correct, but (R) is correct
Explanation:
In aniline $-\mathrm{NH}_{2}$ group is a electron donar $(+\mathrm{M}$ effect). It show an ortho, para directing in electrophilic substitution. $-\mathrm{NH}_{2}$ group stablize the arenium ion formed by ortho, para attach of the electrophile.
AP EAMCET (Engg.) 2013
GENERAL ORGANIC CHEMISTRY
231661
Electrophilic substitution of compound $A$ will be fasted at position
1 1
2 2
3 3
4 4
Explanation:
$-\mathrm{I}$ effect of $-\mathrm{Cl}$ is stronger than $+\mathrm{R}$ effect, hence, it deactivates the ring towards electrophilic substitution. Thus, electrophilic substitution will be fastest at position 4 due to hyperconjugation and $+\mathrm{I}$ effect of $-\mathrm{CH}_{3}$ group. $\mathrm{CH}_{3}$-orthopara director \& activating group $\mathrm{Cl}$-orthopara director \& deactivating group
231638
Consider the following isomeric butanes: What is the correct order of the above isomeric butanes of $\mathrm{S}_{\mathrm{N}_{2}}$ reaction?
1 $2>1>4>3$
2 $1>4>2>3$
3 $3>4>2>1$
4 $4>1>2>3$
Explanation:
As we know that, the order of reactivity of alkyl halide in $\mathrm{S}_{\mathrm{N}_{2}}$ reactions is: methyl $>1^{\circ}>2^{\circ}>3^{\circ}$. The $3^{\circ}$ alkyl halides are so crowded that they do not generally react by $\mathrm{S}_{\mathrm{N}_{2}}$ mechanism.
SCRA 2012
GENERAL ORGANIC CHEMISTRY
231655
Which of the following intermediate is not expected to be formed in the following reaction?
1
2
3
4
Explanation:
The intermediate is formed with following reaction is given as The possible intermediate is \(B C D\).
AIIMS 26 May 2019 (Morning)
GENERAL ORGANIC CHEMISTRY
231659
Assertion (A) $-\mathrm{NH}_{2}$ group of aniline is ortho, para directing in electrophilic substitutions. Reason (R) - $\mathrm{NH}_{2}$ group stabilises the arenium ion formed by the ortho, para attack of the electrophile. The correct answer is
1 Both (A) and (R) are correct, (R) is the correct explanation of $(\mathrm{A})$
2 Both (A) and (R) are correct, (R) is not the correct explanation of (A)
3 (A) is correct, but (R) is not correct
4 (A) is not correct, but (R) is correct
Explanation:
In aniline $-\mathrm{NH}_{2}$ group is a electron donar $(+\mathrm{M}$ effect). It show an ortho, para directing in electrophilic substitution. $-\mathrm{NH}_{2}$ group stablize the arenium ion formed by ortho, para attach of the electrophile.
AP EAMCET (Engg.) 2013
GENERAL ORGANIC CHEMISTRY
231661
Electrophilic substitution of compound $A$ will be fasted at position
1 1
2 2
3 3
4 4
Explanation:
$-\mathrm{I}$ effect of $-\mathrm{Cl}$ is stronger than $+\mathrm{R}$ effect, hence, it deactivates the ring towards electrophilic substitution. Thus, electrophilic substitution will be fastest at position 4 due to hyperconjugation and $+\mathrm{I}$ effect of $-\mathrm{CH}_{3}$ group. $\mathrm{CH}_{3}$-orthopara director \& activating group $\mathrm{Cl}$-orthopara director \& deactivating group
