231454
Stability of iso-butylene can be best explained by
1 Inductive effect
2 Mesomeric effect
3 Hyperconjugative effect
4 Steric effect
Explanation:
Stability of iso-butylene is explained by hyperconjugative structure (effect). Higher the no. of $\alpha$ $\mathrm{H}$ have higher the hyperconjugative structures. In isobutylene- There are 6- $\alpha \mathrm{H}$, then it have six hyperconjugative structure. Hence, 'c' option is correct.
J and K CET-(2010)
GENERAL ORGANIC CHEMISTRY
231455
Which is most acidic of the following?
1 methane
2 acetylene
3 1-butene
4 neo-pentane
Explanation:
Acetylene is most acidic because acetelene have $50 \%$ s-character. The order of acidity is- acetylene $>1$-butene $>$ methane $\approx$ neo-pentane
J and K CET-(2005)
GENERAL ORGANIC CHEMISTRY
231456
The correct order of decreasing acidic nature of $\mathrm{H}_{2} \mathrm{O}, \mathrm{ROH}, \mathrm{CH} \equiv \mathrm{CH}$ and $\mathrm{NH}_{3}$ is
By the help of $\mathrm{pKa}$ value we find the acidic order in $\mathrm{H}_{2} \mathrm{O}, \mathrm{R}-\mathrm{OH}, \mathrm{CH} \equiv \mathrm{CH}$ and $\mathrm{NH}_{3}$. Hence, the decreasing order of acidic strength is\(\mathrm{H}_2 \mathrm{O}>\mathrm{ROH}>\mathrm{CH} \equiv \mathrm{CH}>\mathrm{NH}_3\) Hence, 'b' option is correct.
J and K CET-2005
GENERAL ORGANIC CHEMISTRY
231457
Identify the substitute group that acts as ortho, para director, during electrophilic substitution in aromatic compound
1 $\mathrm{NH}_{2}$
2 $\mathrm{NO}_{2}$
3 $\mathrm{SO}_{3} \mathrm{H}$
4 $\mathrm{N}_{2}$
Explanation:
$\mathrm{NH}_{2}$ is a ortho para directing during electrophilic substitution reaction in oromatic compound. By the resonating structure of aniline we can see that aniline is ortho para directing.
J and K CET-(2007)
GENERAL ORGANIC CHEMISTRY
231458
Chlorobenzene is $\mathbf{o}, \mathbf{p}$-directing in electrophilic substitution reaction. The directing influence is explained by
1 $+\mathrm{M}$ of $\mathrm{Ph}$
2 $+\mathrm{I}$ of $\mathrm{Cl}$
3 $+\mathrm{M}$ of $\mathrm{Cl}$
4 - I of $\mathrm{Ph}$.
Explanation:
The $\mathrm{Cl}$ is a-I-effective group. In one hand $\mathrm{Cl}$ attract electrons towards its shell and other hand it push the electron by $+\mathrm{m}$ (mesomaric effect). The outer six electron pushed by $+\mathrm{m}$ effect. The diagram is shown below- (-) charge density is at ortho and para position. Hence, 'c' option is correct.
231454
Stability of iso-butylene can be best explained by
1 Inductive effect
2 Mesomeric effect
3 Hyperconjugative effect
4 Steric effect
Explanation:
Stability of iso-butylene is explained by hyperconjugative structure (effect). Higher the no. of $\alpha$ $\mathrm{H}$ have higher the hyperconjugative structures. In isobutylene- There are 6- $\alpha \mathrm{H}$, then it have six hyperconjugative structure. Hence, 'c' option is correct.
J and K CET-(2010)
GENERAL ORGANIC CHEMISTRY
231455
Which is most acidic of the following?
1 methane
2 acetylene
3 1-butene
4 neo-pentane
Explanation:
Acetylene is most acidic because acetelene have $50 \%$ s-character. The order of acidity is- acetylene $>1$-butene $>$ methane $\approx$ neo-pentane
J and K CET-(2005)
GENERAL ORGANIC CHEMISTRY
231456
The correct order of decreasing acidic nature of $\mathrm{H}_{2} \mathrm{O}, \mathrm{ROH}, \mathrm{CH} \equiv \mathrm{CH}$ and $\mathrm{NH}_{3}$ is
By the help of $\mathrm{pKa}$ value we find the acidic order in $\mathrm{H}_{2} \mathrm{O}, \mathrm{R}-\mathrm{OH}, \mathrm{CH} \equiv \mathrm{CH}$ and $\mathrm{NH}_{3}$. Hence, the decreasing order of acidic strength is\(\mathrm{H}_2 \mathrm{O}>\mathrm{ROH}>\mathrm{CH} \equiv \mathrm{CH}>\mathrm{NH}_3\) Hence, 'b' option is correct.
J and K CET-2005
GENERAL ORGANIC CHEMISTRY
231457
Identify the substitute group that acts as ortho, para director, during electrophilic substitution in aromatic compound
1 $\mathrm{NH}_{2}$
2 $\mathrm{NO}_{2}$
3 $\mathrm{SO}_{3} \mathrm{H}$
4 $\mathrm{N}_{2}$
Explanation:
$\mathrm{NH}_{2}$ is a ortho para directing during electrophilic substitution reaction in oromatic compound. By the resonating structure of aniline we can see that aniline is ortho para directing.
J and K CET-(2007)
GENERAL ORGANIC CHEMISTRY
231458
Chlorobenzene is $\mathbf{o}, \mathbf{p}$-directing in electrophilic substitution reaction. The directing influence is explained by
1 $+\mathrm{M}$ of $\mathrm{Ph}$
2 $+\mathrm{I}$ of $\mathrm{Cl}$
3 $+\mathrm{M}$ of $\mathrm{Cl}$
4 - I of $\mathrm{Ph}$.
Explanation:
The $\mathrm{Cl}$ is a-I-effective group. In one hand $\mathrm{Cl}$ attract electrons towards its shell and other hand it push the electron by $+\mathrm{m}$ (mesomaric effect). The outer six electron pushed by $+\mathrm{m}$ effect. The diagram is shown below- (-) charge density is at ortho and para position. Hence, 'c' option is correct.
231454
Stability of iso-butylene can be best explained by
1 Inductive effect
2 Mesomeric effect
3 Hyperconjugative effect
4 Steric effect
Explanation:
Stability of iso-butylene is explained by hyperconjugative structure (effect). Higher the no. of $\alpha$ $\mathrm{H}$ have higher the hyperconjugative structures. In isobutylene- There are 6- $\alpha \mathrm{H}$, then it have six hyperconjugative structure. Hence, 'c' option is correct.
J and K CET-(2010)
GENERAL ORGANIC CHEMISTRY
231455
Which is most acidic of the following?
1 methane
2 acetylene
3 1-butene
4 neo-pentane
Explanation:
Acetylene is most acidic because acetelene have $50 \%$ s-character. The order of acidity is- acetylene $>1$-butene $>$ methane $\approx$ neo-pentane
J and K CET-(2005)
GENERAL ORGANIC CHEMISTRY
231456
The correct order of decreasing acidic nature of $\mathrm{H}_{2} \mathrm{O}, \mathrm{ROH}, \mathrm{CH} \equiv \mathrm{CH}$ and $\mathrm{NH}_{3}$ is
By the help of $\mathrm{pKa}$ value we find the acidic order in $\mathrm{H}_{2} \mathrm{O}, \mathrm{R}-\mathrm{OH}, \mathrm{CH} \equiv \mathrm{CH}$ and $\mathrm{NH}_{3}$. Hence, the decreasing order of acidic strength is\(\mathrm{H}_2 \mathrm{O}>\mathrm{ROH}>\mathrm{CH} \equiv \mathrm{CH}>\mathrm{NH}_3\) Hence, 'b' option is correct.
J and K CET-2005
GENERAL ORGANIC CHEMISTRY
231457
Identify the substitute group that acts as ortho, para director, during electrophilic substitution in aromatic compound
1 $\mathrm{NH}_{2}$
2 $\mathrm{NO}_{2}$
3 $\mathrm{SO}_{3} \mathrm{H}$
4 $\mathrm{N}_{2}$
Explanation:
$\mathrm{NH}_{2}$ is a ortho para directing during electrophilic substitution reaction in oromatic compound. By the resonating structure of aniline we can see that aniline is ortho para directing.
J and K CET-(2007)
GENERAL ORGANIC CHEMISTRY
231458
Chlorobenzene is $\mathbf{o}, \mathbf{p}$-directing in electrophilic substitution reaction. The directing influence is explained by
1 $+\mathrm{M}$ of $\mathrm{Ph}$
2 $+\mathrm{I}$ of $\mathrm{Cl}$
3 $+\mathrm{M}$ of $\mathrm{Cl}$
4 - I of $\mathrm{Ph}$.
Explanation:
The $\mathrm{Cl}$ is a-I-effective group. In one hand $\mathrm{Cl}$ attract electrons towards its shell and other hand it push the electron by $+\mathrm{m}$ (mesomaric effect). The outer six electron pushed by $+\mathrm{m}$ effect. The diagram is shown below- (-) charge density is at ortho and para position. Hence, 'c' option is correct.
231454
Stability of iso-butylene can be best explained by
1 Inductive effect
2 Mesomeric effect
3 Hyperconjugative effect
4 Steric effect
Explanation:
Stability of iso-butylene is explained by hyperconjugative structure (effect). Higher the no. of $\alpha$ $\mathrm{H}$ have higher the hyperconjugative structures. In isobutylene- There are 6- $\alpha \mathrm{H}$, then it have six hyperconjugative structure. Hence, 'c' option is correct.
J and K CET-(2010)
GENERAL ORGANIC CHEMISTRY
231455
Which is most acidic of the following?
1 methane
2 acetylene
3 1-butene
4 neo-pentane
Explanation:
Acetylene is most acidic because acetelene have $50 \%$ s-character. The order of acidity is- acetylene $>1$-butene $>$ methane $\approx$ neo-pentane
J and K CET-(2005)
GENERAL ORGANIC CHEMISTRY
231456
The correct order of decreasing acidic nature of $\mathrm{H}_{2} \mathrm{O}, \mathrm{ROH}, \mathrm{CH} \equiv \mathrm{CH}$ and $\mathrm{NH}_{3}$ is
By the help of $\mathrm{pKa}$ value we find the acidic order in $\mathrm{H}_{2} \mathrm{O}, \mathrm{R}-\mathrm{OH}, \mathrm{CH} \equiv \mathrm{CH}$ and $\mathrm{NH}_{3}$. Hence, the decreasing order of acidic strength is\(\mathrm{H}_2 \mathrm{O}>\mathrm{ROH}>\mathrm{CH} \equiv \mathrm{CH}>\mathrm{NH}_3\) Hence, 'b' option is correct.
J and K CET-2005
GENERAL ORGANIC CHEMISTRY
231457
Identify the substitute group that acts as ortho, para director, during electrophilic substitution in aromatic compound
1 $\mathrm{NH}_{2}$
2 $\mathrm{NO}_{2}$
3 $\mathrm{SO}_{3} \mathrm{H}$
4 $\mathrm{N}_{2}$
Explanation:
$\mathrm{NH}_{2}$ is a ortho para directing during electrophilic substitution reaction in oromatic compound. By the resonating structure of aniline we can see that aniline is ortho para directing.
J and K CET-(2007)
GENERAL ORGANIC CHEMISTRY
231458
Chlorobenzene is $\mathbf{o}, \mathbf{p}$-directing in electrophilic substitution reaction. The directing influence is explained by
1 $+\mathrm{M}$ of $\mathrm{Ph}$
2 $+\mathrm{I}$ of $\mathrm{Cl}$
3 $+\mathrm{M}$ of $\mathrm{Cl}$
4 - I of $\mathrm{Ph}$.
Explanation:
The $\mathrm{Cl}$ is a-I-effective group. In one hand $\mathrm{Cl}$ attract electrons towards its shell and other hand it push the electron by $+\mathrm{m}$ (mesomaric effect). The outer six electron pushed by $+\mathrm{m}$ effect. The diagram is shown below- (-) charge density is at ortho and para position. Hence, 'c' option is correct.
231454
Stability of iso-butylene can be best explained by
1 Inductive effect
2 Mesomeric effect
3 Hyperconjugative effect
4 Steric effect
Explanation:
Stability of iso-butylene is explained by hyperconjugative structure (effect). Higher the no. of $\alpha$ $\mathrm{H}$ have higher the hyperconjugative structures. In isobutylene- There are 6- $\alpha \mathrm{H}$, then it have six hyperconjugative structure. Hence, 'c' option is correct.
J and K CET-(2010)
GENERAL ORGANIC CHEMISTRY
231455
Which is most acidic of the following?
1 methane
2 acetylene
3 1-butene
4 neo-pentane
Explanation:
Acetylene is most acidic because acetelene have $50 \%$ s-character. The order of acidity is- acetylene $>1$-butene $>$ methane $\approx$ neo-pentane
J and K CET-(2005)
GENERAL ORGANIC CHEMISTRY
231456
The correct order of decreasing acidic nature of $\mathrm{H}_{2} \mathrm{O}, \mathrm{ROH}, \mathrm{CH} \equiv \mathrm{CH}$ and $\mathrm{NH}_{3}$ is
By the help of $\mathrm{pKa}$ value we find the acidic order in $\mathrm{H}_{2} \mathrm{O}, \mathrm{R}-\mathrm{OH}, \mathrm{CH} \equiv \mathrm{CH}$ and $\mathrm{NH}_{3}$. Hence, the decreasing order of acidic strength is\(\mathrm{H}_2 \mathrm{O}>\mathrm{ROH}>\mathrm{CH} \equiv \mathrm{CH}>\mathrm{NH}_3\) Hence, 'b' option is correct.
J and K CET-2005
GENERAL ORGANIC CHEMISTRY
231457
Identify the substitute group that acts as ortho, para director, during electrophilic substitution in aromatic compound
1 $\mathrm{NH}_{2}$
2 $\mathrm{NO}_{2}$
3 $\mathrm{SO}_{3} \mathrm{H}$
4 $\mathrm{N}_{2}$
Explanation:
$\mathrm{NH}_{2}$ is a ortho para directing during electrophilic substitution reaction in oromatic compound. By the resonating structure of aniline we can see that aniline is ortho para directing.
J and K CET-(2007)
GENERAL ORGANIC CHEMISTRY
231458
Chlorobenzene is $\mathbf{o}, \mathbf{p}$-directing in electrophilic substitution reaction. The directing influence is explained by
1 $+\mathrm{M}$ of $\mathrm{Ph}$
2 $+\mathrm{I}$ of $\mathrm{Cl}$
3 $+\mathrm{M}$ of $\mathrm{Cl}$
4 - I of $\mathrm{Ph}$.
Explanation:
The $\mathrm{Cl}$ is a-I-effective group. In one hand $\mathrm{Cl}$ attract electrons towards its shell and other hand it push the electron by $+\mathrm{m}$ (mesomaric effect). The outer six electron pushed by $+\mathrm{m}$ effect. The diagram is shown below- (-) charge density is at ortho and para position. Hence, 'c' option is correct.
