A nucleophile is:

A nucleophile is:
by

1 Answer

Answer :

A nucleophile is: A. electron-rich species B. electron-deficient species C. a Lewis base D. positively charged species
by
selected by

Related questions

When semicarbazide reacts with a ketone (or aldehyde) to form semicarbazone. Only one nitrogen atom of semicarbazide acts as a nucleophile and attack

Description : When semicarbazide reacts with a ketone (or aldehyde) to form semicarbazone. Only one nitrogen atom of semicarbazide acts as a nucleophile and attack

Last Answer : When semicarbazide reacts with a ketone (or aldehyde) to form semicarbazone. Only one ... atoms of semicarbazide are relatively non nucleophilic ?

Which of the following is not a nucleophile ?

Description : Which of the following is not a nucleophile ?

Last Answer : Which of the following is not a nucleophile ? A. `H_(2)` B. `CH_(3)OH` C. `H_(2)O` D. `NH_(3)`

Which among the following compounds behave both as an electrophile as well a nucleophile? `{:(underset("(1)")(CH_(2)=CH_(2))" "underset("(2)")(CH_(2)=

Description : Which among the following compounds behave both as an electrophile as well a nucleophile? `{:(underset("(1)")(CH_(2)=CH_(2))" "underset("(2)")(CH_(2)=

Last Answer : Which among the following compounds behave both as an electrophile as well a nucleophile? `{:(underset("(1)")(CH_(2)= ... and (4) D. (2), (3) and (4)

`NH_(3) + NaOCl overset("golatin or " EDTA^(+))rarr` products The number of moles of `N - H` bonds present in one mole of the strongest nucleophile pr

Description : `NH_(3) + NaOCl overset("golatin or " EDTA^(+))rarr` products The number of moles of `N - H` bonds present in one mole of the strongest nucleophile pr

Last Answer : `NH_(3) + NaOCl overset("golatin or " EDTA^(+))rarr` products The number of moles of ... mole of the strongest nucleophile present in the product is:

Which of the following is not a nucleophile ?

Description : Which of the following is not a nucleophile ?

Last Answer : Which of the following is not a nucleophile ? A. `H_(2)` B. `CH_(3)OH` C. `H_(2)O` D. `NH_(3)`

Which among the following compounds behave both as an electrophile as well a nucleophile? `{:(underset("(1)")(CH_(2)=CH_(2))" "underset("(2)")(CH_(2)=

Description : Which among the following compounds behave both as an electrophile as well a nucleophile? `{:(underset("(1)")(CH_(2)=CH_(2))" "underset("(2)")(CH_(2)=

Last Answer : Which among the following compounds behave both as an electrophile as well a nucleophile? `{:(underset("(1)")(CH_(2)= ... and (4) D. (2), (3) and (4)

`NH_(3) + NaOCl overset("golatin or " EDTA^(+))rarr` products The number of moles of `N - H` bonds present in one mole of the strongest nucleophile pr

Description : `NH_(3) + NaOCl overset("golatin or " EDTA^(+))rarr` products The number of moles of `N - H` bonds present in one mole of the strongest nucleophile pr

Last Answer : `NH_(3) + NaOCl overset("golatin or " EDTA^(+))rarr` products The number of moles of ... mole of the strongest nucleophile present in the product is:

Which of the following are nucleophile?

Description : Which of the following are nucleophile?

Last Answer : Which of the following are nucleophile? A. `NH_(3)` B. `OH^(-)` C. `R-O-R` D. `AlCl_(3)`

A nucleophile must have :

Description : A nucleophile must have :

Last Answer : A nucleophile must have : A. a negative charge B. a positive charge C. a lone pair of electron D. an electron deficient centre

Which one of the following behaves both as a nucleophile and an electrophile ?

Description : Which one of the following behaves both as a nucleophile and an electrophile ?

Last Answer : Which one of the following behaves both as a nucleophile and an electrophile ? A. `CH_(3)NH_(2)` B. `CH_(3)OH` C. `CH_(3)CN` D. `CH_(3)Cl`

Why cyanide ion act as ambident nucleophile ?

Description : Why cyanide ion act as ambident nucleophile ?

Last Answer : Ans.---- Cyanide ion can link through either carbon or nitrogen, therefore it is an ambident nuclophile.

Which of the following is not a correct statement about the electrophilic substitution mechanism of benzene? (a) Benzene functions as a nucleophile. (b) Formation of a carbocation intermediate is the rate-determining step. (c) The carbocation intermediate contains an sp3 hybridized carbon in the ring. (d) The addition product is a frequently observed minor product.

Description : Which of the following is not a correct statement about the electrophilic substitution mechanism of benzene? (a) Benzene functions as a nucleophile. (b) Formation of a carbocation intermediate is the ... hybridized carbon in the ring. (d) The addition product is a frequently observed minor product.

Last Answer : The addition product is a frequently observed minor product.

Why do aldehydes undergo nucleophilic addition reactions while esters undergo nucleophilic acyl substitution reactions? (a) The carbonyl carbon of an ester is more electrophilic than that of an aldehyde. (b) Aldehydes are more sterically hindered than esters. (c) Once the nucleophile adds to an aldehyde, the tetrahedral intermediate is too sterically hindered to eliminate one of the attached groups. (d) Once the nucleophile adds to an aldehyde, neither H− nor R− can be eliminated since they are strongly basic

Description : Why do aldehydes undergo nucleophilic addition reactions while esters undergo nucleophilic acyl substitution reactions? (a) The carbonyl carbon of an ester is more electrophilic than that of an aldehyde. (b) ... adds to an aldehyde, neither H− nor R− can be eliminated since they are strongly basic

Last Answer : Once the nucleophile adds to an aldehyde, neither H− nor R− can be eliminated since they are strongly basic

Which of the following factors has no effect on the rate of SN1 reactions? (a) the nature of the alkyl halide (b) the nature of the leaving group (c) the concentration of the alkyl halide (d) the concentration of the nucleophile

Description : Which of the following factors has no effect on the rate of SN1 reactions? (a) the nature of the alkyl halide (b) the nature of the leaving group (c) the concentration of the alkyl halide (d) the concentration of the nucleophile

Last Answer : the concentration of the nucleophile

Which of the following is the rate law for SN1 mechanisms? (a) Rate = k[Alkyl Halide] [Nucleophile] (b) Rate = k[Nucleophile] (c) Rate = k[Alkyl Halide](d) Rate = k1[Alkyl Halide] + k2[Nucleophile]

Description : Which of the following is the rate law for SN1 mechanisms? (a) Rate = k[Alkyl Halide] [Nucleophile] (b) Rate = k[Nucleophile] (c) Rate = k[Alkyl Halide] (d) Rate = k1[Alkyl Halide] + k2[Nucleophile]

Last Answer : Rate = k[Alkyl Halide]

Which of the following is the best nucleophile in water? (a) I– (b) CH3SCH3 (c) CH3OCH3 (d) Cl–

Description : Which of the following is the best nucleophile in water? (a) I– (b) CH3SCH3 (c) CH3OCH3 (d) Cl–

Last Answer : I–

Which of the following is the strongest nucleophile in an aqueous solution? (a) HO– (b) Cl– (c) Br– (d) I

Description : Which of the following is the strongest nucleophile in an aqueous solution? (a) HO– (b) Cl– (c) Br– (d) I

Last Answer : I–

Which of the following statements concerning SN2 reactions of alkyl halides is not correct? (a) The rate of reaction depends on the concentration of the nucleophile. (b) The rate of reaction depends on the concentration of the alkyl halide. (c) The rate of reaction of a particular alkyl bromide depends on the steric accessibility of the carbon of the C-Br bond. (d) All alkyl iodides react more rapidly than all alkyl chlorides

Description : Which of the following statements concerning SN2 reactions of alkyl halides is not correct? (a) The rate of reaction depends on the concentration of the nucleophile. (b) The rate of reaction depends on the ... carbon of the C-Br bond. (d) All alkyl iodides react more rapidly than all alkyl chlorides

Last Answer : All alkyl iodides react more rapidly than all alkyl chlorides

Which of the following factors influence whether a reaction will proceed by an SN1, SN2, E1, or E2 mechanism? (a) Structure of the alkyl halide (b) Solvent (c) Concentration of reagents (d) Nature of the nucleophile (e) All of these

Description : Which of the following factors influence whether a reaction will proceed by an SN1, SN2, E1, or E2 mechanism? (a) Structure of the alkyl halide (b) Solvent (c) Concentration of reagents (d) Nature of the nucleophile (e) All of these

Last Answer : All of these

Which of the following is not a possible reaction of a carbocation? (a) addition of a nucleophile (b) rearrangement to a more stable carbocation (c) addition of a proton to form an alkane (d) loss of a β-hydrogen to form an alkene

Description : Which of the following is not a possible reaction of a carbocation? (a) addition of a nucleophile (b) rearrangement to a more stable carbocation (c) addition of a proton to form an alkane (d) loss of a β-hydrogen to form an alkene

Last Answer : addition of a proton to form an alkane

Which of the following statements correctly describes the general reactivity of alkynes? (a) An alkyne is an electron-rich molecule and therefore reacts as a nucleophile. (b) The σ bonds of alkynes are higher in energy than the bonds and are thus more reactive. (c) Unlike alkenes, alkynes fail to undergo electrophilic addition reactions. (d) Alkynes are generally more reactive than alkenes.

Description : Which of the following statements correctly describes the general reactivity of alkynes? (a) An alkyne is an electron-rich molecule and therefore reacts as a nucleophile. (b) The σ bonds ... fail to undergo electrophilic addition reactions. (d) Alkynes are generally more reactive than alkenes.

Last Answer : Alkynes are generally more reactive than alkenes.

Why does a H+ ion attacking a carbon-carbon double bond add to the carbon with the least number of substituents? (a) the reaction is resonance stabilized. (b) the hybrid geometry favors this process. (c) nucleophile tends to attack stable centers of negative charge. (d) a more stable carbonium ion is generated.

Description : Why does a H+ ion attacking a carbon-carbon double bond add to the carbon with the least number of substituents? (a) the reaction is resonance stabilized. (b) the hybrid geometry favors this ... tends to attack stable centers of negative charge. (d) a more stable carbonium ion is generated.

Last Answer : a more stable carbonium ion is generated.

In the reaction of propene with HCl, H+ ion acts as the : (a) electrophile (b) carbonium ion (c) nucleophile (d) carbanion

Description : In the reaction of propene with HCl, H+ ion acts as the : (a) electrophile (b) carbonium ion (c) nucleophile (d) carbanion

Last Answer : electrophile

Which of the following statements is incorrect? (a) Electrons move toward positively charged locations. (b) An electron-rich atom is called an electrophile. (c) An electrophile is electron loving. (d) A nucleophile has a a pair of electrons it can share

Description : Which of the following statements is incorrect? (a) Electrons move toward positively charged locations. (b) An electron-rich atom is called an electrophile. (c) An electrophile is electron loving. (d) A nucleophile has a a pair of electrons it can share

Last Answer : An electron-rich atom is called an electrophile.

Which of the following is not a nucleophile? (a) FeBr3 (b) Br– (c) NH3 (d) CH3OCH3

Description : Which of the following is not a nucleophile? (a) FeBr3 (b) Br– (c) NH3 (d) CH3OCH3

Last Answer : CH3OCH3

Which of the following is not normally considered to be a nucleophile? (a) NH3 (b) CH3NH2 (c) HC≡C:– (d) CH3CH2+

Description : Which of the following is not normally considered to be a nucleophile? (a) NH3 (b) CH3NH2 (c) HC≡C:– (d) CH3CH2+

Last Answer : CH3CH2+

A nucleophile acts as a __________ when it reacts with an electrophile. (a) Bronsted-Lowry acid (b) Arrhenius base (c) Lewis acid (d) Lewis base

Description : A nucleophile acts as a __________ when it reacts with an electrophile. (a) Bronsted-Lowry acid (b) Arrhenius base (c) Lewis acid (d) Lewis base

Last Answer : Lewis base

An electrophile acts as a __________ when it reacts with a nucleophile. (a) Bronsted-Lowry base (b) Arrhenius base (c) Lewis acid(d) Lewis base

Description : An electrophile acts as a __________ when it reacts with a nucleophile. (a) Bronsted-Lowry base (b) Arrhenius base (c) Lewis acid (d) Lewis base

Last Answer : Lewis acid

Which of the following is not a nucleophile? (a) NH3 (b) HSO3– (c) AlCl3 (d) HO–

Description : Which of the following is not a nucleophile? (a) NH3 (b) HSO3– (c) AlCl3 (d) HO–

Last Answer : AlCl3

Which of the following is a nucleophile? (a) AlCl3 (b) H3O+ (c) BF3 (d) CN–

Description : Which of the following is a nucleophile? (a) AlCl3 (b) H3O+ (c) BF3 (d) CN–

Last Answer : CN–