231576
The correct statement regarding electrophile is
1 Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from another electrophile
2 Electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile
3 Electrophile can be either neutral or positively charged species and can form a bond by accepting a pair of electrons from nucleophile
4 Electrophile is a negatively changed species and can form a bond by accepting a pair of electrons from a nucleophile
Explanation:
Electrophile means that species which accept electron is known as electrophile. Electron accepted by vacant orbital or $(+)$ charge species. Hence the electrophiles is may be neutral may be $(+)$ charge species- $\mathrm{BF}_{3}, \mathrm{BH}_{3}, \mathrm{AlCl}_{3}, \mathrm{NO}_{2}^{+}, \mathrm{Cl}^{\oplus}, \mathrm{SO}_{3}$. etc are electrophile that is it accept electron by nucleophile.
AIPMT -2007
GENERAL ORGANIC CHEMISTRY
231577
Which of the following statements is not correct for a nucleophile?
(a) Ammonia is nucleophile because it have free lone pair electron. (b) Nucleophiles attack at low $\mathrm{e}^{\ominus}$ density sites because nucleophile has already electron density. (c) Nucleophiles are not electron seeking because nucleophiles have already electron density. (d) Nucleophile is a lewis base not the lewis acid.
NEET-2015
GENERAL ORGANIC CHEMISTRY
231578
A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following?
1 $-\mathrm{I}$ effect of $-\mathrm{CH}_{3}$ groups
2 $+\mathrm{R}$ effect of $-\mathrm{CH}_{3}$ groups
3 $-\mathrm{R}$ effect of $-\mathrm{CH}_{3}$ groups
4 Hyperconjugation
Explanation:
Tertiary butyl carbocation is more stable than the secondary butyl carbocation. Because of the tertbutyl carbocation have higher no. hyper conjugative structure than the secondary butyl carbocation. Which is given below- Hence due to Hyper conjunction tert butyl carbocation is more stable.
NEET-2020
GENERAL ORGANIC CHEMISTRY
231585
Which one of the following is least basic?
1 $\mathrm{NF}_{3}$
2 $\mathrm{NCl}_{3}$
3 $\mathrm{NBr}_{3}$
4 $\mathrm{Nl}_{3}$
Explanation:
Basic character of trihalides follows following decreasing order $\mathrm{NI}_{3}>\mathrm{NBr}_{3}>\mathrm{NCl}_{3}>\mathrm{NF}_{3}$ Hence, $\mathrm{NF}_{3}$ is least basic. Despite the presence of a lone pair of electrons on nitrogen, $\mathrm{NF}_{3}$ does not act as Lewis base. There is no known compound in which it donates a pair of electrons to other reagents.
231576
The correct statement regarding electrophile is
1 Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from another electrophile
2 Electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile
3 Electrophile can be either neutral or positively charged species and can form a bond by accepting a pair of electrons from nucleophile
4 Electrophile is a negatively changed species and can form a bond by accepting a pair of electrons from a nucleophile
Explanation:
Electrophile means that species which accept electron is known as electrophile. Electron accepted by vacant orbital or $(+)$ charge species. Hence the electrophiles is may be neutral may be $(+)$ charge species- $\mathrm{BF}_{3}, \mathrm{BH}_{3}, \mathrm{AlCl}_{3}, \mathrm{NO}_{2}^{+}, \mathrm{Cl}^{\oplus}, \mathrm{SO}_{3}$. etc are electrophile that is it accept electron by nucleophile.
AIPMT -2007
GENERAL ORGANIC CHEMISTRY
231577
Which of the following statements is not correct for a nucleophile?
(a) Ammonia is nucleophile because it have free lone pair electron. (b) Nucleophiles attack at low $\mathrm{e}^{\ominus}$ density sites because nucleophile has already electron density. (c) Nucleophiles are not electron seeking because nucleophiles have already electron density. (d) Nucleophile is a lewis base not the lewis acid.
NEET-2015
GENERAL ORGANIC CHEMISTRY
231578
A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following?
1 $-\mathrm{I}$ effect of $-\mathrm{CH}_{3}$ groups
2 $+\mathrm{R}$ effect of $-\mathrm{CH}_{3}$ groups
3 $-\mathrm{R}$ effect of $-\mathrm{CH}_{3}$ groups
4 Hyperconjugation
Explanation:
Tertiary butyl carbocation is more stable than the secondary butyl carbocation. Because of the tertbutyl carbocation have higher no. hyper conjugative structure than the secondary butyl carbocation. Which is given below- Hence due to Hyper conjunction tert butyl carbocation is more stable.
NEET-2020
GENERAL ORGANIC CHEMISTRY
231585
Which one of the following is least basic?
1 $\mathrm{NF}_{3}$
2 $\mathrm{NCl}_{3}$
3 $\mathrm{NBr}_{3}$
4 $\mathrm{Nl}_{3}$
Explanation:
Basic character of trihalides follows following decreasing order $\mathrm{NI}_{3}>\mathrm{NBr}_{3}>\mathrm{NCl}_{3}>\mathrm{NF}_{3}$ Hence, $\mathrm{NF}_{3}$ is least basic. Despite the presence of a lone pair of electrons on nitrogen, $\mathrm{NF}_{3}$ does not act as Lewis base. There is no known compound in which it donates a pair of electrons to other reagents.
NEET Test Series from KOTA - 10 Papers In MS WORD
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GENERAL ORGANIC CHEMISTRY
231576
The correct statement regarding electrophile is
1 Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from another electrophile
2 Electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile
3 Electrophile can be either neutral or positively charged species and can form a bond by accepting a pair of electrons from nucleophile
4 Electrophile is a negatively changed species and can form a bond by accepting a pair of electrons from a nucleophile
Explanation:
Electrophile means that species which accept electron is known as electrophile. Electron accepted by vacant orbital or $(+)$ charge species. Hence the electrophiles is may be neutral may be $(+)$ charge species- $\mathrm{BF}_{3}, \mathrm{BH}_{3}, \mathrm{AlCl}_{3}, \mathrm{NO}_{2}^{+}, \mathrm{Cl}^{\oplus}, \mathrm{SO}_{3}$. etc are electrophile that is it accept electron by nucleophile.
AIPMT -2007
GENERAL ORGANIC CHEMISTRY
231577
Which of the following statements is not correct for a nucleophile?
(a) Ammonia is nucleophile because it have free lone pair electron. (b) Nucleophiles attack at low $\mathrm{e}^{\ominus}$ density sites because nucleophile has already electron density. (c) Nucleophiles are not electron seeking because nucleophiles have already electron density. (d) Nucleophile is a lewis base not the lewis acid.
NEET-2015
GENERAL ORGANIC CHEMISTRY
231578
A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following?
1 $-\mathrm{I}$ effect of $-\mathrm{CH}_{3}$ groups
2 $+\mathrm{R}$ effect of $-\mathrm{CH}_{3}$ groups
3 $-\mathrm{R}$ effect of $-\mathrm{CH}_{3}$ groups
4 Hyperconjugation
Explanation:
Tertiary butyl carbocation is more stable than the secondary butyl carbocation. Because of the tertbutyl carbocation have higher no. hyper conjugative structure than the secondary butyl carbocation. Which is given below- Hence due to Hyper conjunction tert butyl carbocation is more stable.
NEET-2020
GENERAL ORGANIC CHEMISTRY
231585
Which one of the following is least basic?
1 $\mathrm{NF}_{3}$
2 $\mathrm{NCl}_{3}$
3 $\mathrm{NBr}_{3}$
4 $\mathrm{Nl}_{3}$
Explanation:
Basic character of trihalides follows following decreasing order $\mathrm{NI}_{3}>\mathrm{NBr}_{3}>\mathrm{NCl}_{3}>\mathrm{NF}_{3}$ Hence, $\mathrm{NF}_{3}$ is least basic. Despite the presence of a lone pair of electrons on nitrogen, $\mathrm{NF}_{3}$ does not act as Lewis base. There is no known compound in which it donates a pair of electrons to other reagents.
231576
The correct statement regarding electrophile is
1 Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from another electrophile
2 Electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile
3 Electrophile can be either neutral or positively charged species and can form a bond by accepting a pair of electrons from nucleophile
4 Electrophile is a negatively changed species and can form a bond by accepting a pair of electrons from a nucleophile
Explanation:
Electrophile means that species which accept electron is known as electrophile. Electron accepted by vacant orbital or $(+)$ charge species. Hence the electrophiles is may be neutral may be $(+)$ charge species- $\mathrm{BF}_{3}, \mathrm{BH}_{3}, \mathrm{AlCl}_{3}, \mathrm{NO}_{2}^{+}, \mathrm{Cl}^{\oplus}, \mathrm{SO}_{3}$. etc are electrophile that is it accept electron by nucleophile.
AIPMT -2007
GENERAL ORGANIC CHEMISTRY
231577
Which of the following statements is not correct for a nucleophile?
(a) Ammonia is nucleophile because it have free lone pair electron. (b) Nucleophiles attack at low $\mathrm{e}^{\ominus}$ density sites because nucleophile has already electron density. (c) Nucleophiles are not electron seeking because nucleophiles have already electron density. (d) Nucleophile is a lewis base not the lewis acid.
NEET-2015
GENERAL ORGANIC CHEMISTRY
231578
A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following?
1 $-\mathrm{I}$ effect of $-\mathrm{CH}_{3}$ groups
2 $+\mathrm{R}$ effect of $-\mathrm{CH}_{3}$ groups
3 $-\mathrm{R}$ effect of $-\mathrm{CH}_{3}$ groups
4 Hyperconjugation
Explanation:
Tertiary butyl carbocation is more stable than the secondary butyl carbocation. Because of the tertbutyl carbocation have higher no. hyper conjugative structure than the secondary butyl carbocation. Which is given below- Hence due to Hyper conjunction tert butyl carbocation is more stable.
NEET-2020
GENERAL ORGANIC CHEMISTRY
231585
Which one of the following is least basic?
1 $\mathrm{NF}_{3}$
2 $\mathrm{NCl}_{3}$
3 $\mathrm{NBr}_{3}$
4 $\mathrm{Nl}_{3}$
Explanation:
Basic character of trihalides follows following decreasing order $\mathrm{NI}_{3}>\mathrm{NBr}_{3}>\mathrm{NCl}_{3}>\mathrm{NF}_{3}$ Hence, $\mathrm{NF}_{3}$ is least basic. Despite the presence of a lone pair of electrons on nitrogen, $\mathrm{NF}_{3}$ does not act as Lewis base. There is no known compound in which it donates a pair of electrons to other reagents.
