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)
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
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.
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
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
Description : The electrophile involved in the above reaction is:
Last Answer : The electrophile involved in the above reaction is: A. Dichloromethyl cation `(overset(o+)(C)HCl_(2))` B. ... ` D. Formyl cation `(overset(o+)(C)HO)`
Description : Which of the following are electrophile?
Last Answer : Which of the following are electrophile? A. `CN^(-)` B. `BF_(3)` C. `NO_(2)^(+)` D. `AlCl_(3)`
Description : Electrophile `NO_(2)^(+)` attacks on the following: In which cases will `NO_(2)^(+)` be at meta-position?
Last Answer : Electrophile `NO_(2)^(+)` attacks on the following: In which cases will `NO_(2)^(+)` be at meta-position? ... I, II and III C. II and III D. I only
Description : Least active electrophile is :
Last Answer : Least active electrophile is : A. `CH_(3)-overset(O)overset(||)C-OCH_(3)` B. `CH_(3)-overset(O)overset( ... D. `CH_(3)-overset(O)overset(||)C-SCH_(3)`
Description : The electrophile, `E^((o+))` attacks the benzene ring to generate the intermediate `sigma`-complex. Of the following which `sigma`-complex is of lowes
Last Answer : The electrophile, `E^((o+))` attacks the benzene ring to generate the intermediate `sigma`-complex. Of the ... is of lowest energy? A. B. C. D.
Description : Which one of the following characteristics belongs to an electrophile?
Last Answer : Which one of the following characteristics belongs to an electrophile? A. It is any species having electron ... in nature D. It is anionic in nature
Description : In the reaction of phenol with `CHCl_(3)` and aqueous `NaOH` at `70^(@)`, the electrophile attacking the ring is:
Last Answer : In the reaction of phenol with `CHCl_(3)` and aqueous `NaOH` at `70^(@)`, the electrophile attacking the ring is: ... ` C. `:"CCl"_(2)` D. `COCl_(2)`
Description : In a Friedel-Crafts reaction, the electrophile is:
Last Answer : In a Friedel-Crafts reaction, the electrophile is: A. `Cl^(-) or X^(-)` B. `CH_(3)^(+)or CH_(3)CO^(+)` C. `CH_(3)Cl` D. `CH_(3)COCl`
Description : `C_(6)H_(5)OH+CHCl_(3)+NaOH rarr` salicyladehyde The electrophile involved in the above reaction is.
Last Answer : `C_(6)H_(5)OH+CHCl_(3)+NaOH rarr` salicyladehyde The electrophile involved in the above reaction is. A. ... ` D. formly cation `(overset(o+)(C)HO)`
Description : Electron-withdrawing groups are meta directors because : (a) the carbonium ion intermediate has a negative charge on the meta position. (b) the more stable resonance hybrid occurs with meta ... the electrophile. (d) the carbonium ion intermediate has a positive charge on the meta position
Last Answer : the more stable resonance hybrid occurs with meta attachment of the electrophile.
Description : Which of the following is not correct concerning substitution and elimination reactions of alkyl halides? (a) The electrophile replaces the leaving group. (b) Compounds containing electron-donating groups bonded to an ... replaced by another atom or group in substitution reactions. (d) (a) and (b)
Last Answer : (a) and (b)
Description : Which of the following is not an electrophile? (a) NH3 (b) Br+ (c) AlCl3 (d) NO2+
Last Answer : NH3
Description : Which element behaves chemically both as metal and nonmetal? (1) Argon (2) Boron (3) Xenon (4) Carbon
Last Answer : (2) Boron Explanation: Some elements behave chemically both as metals and nonmetals, and are called metalloids. Their examples include Boron, Silicon, Germanium and Antimony. Elements which are neither metals nor nonmetals are called Noble Gases.
Description : Which of the following behaves like the entry point of the monitor and reroutes the instructions of the virtual machine? A. Dispatcher B. Allocator C. Interpreter D. Both A and B
Last Answer : . Dispatcher
Description : Which element behaves chemically both as metal and nonmetal ? (1) Argon (2) Boron (3) Xenon (4) Carbon
Last Answer : Boron
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 ?
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)`
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:
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)`
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
Description : A nucleophile is:
Last Answer : A nucleophile is: A. electron-rich species B. electron-deficient species C. a Lewis base D. positively charged species
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.
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.
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
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
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]
Description : Which of the following is the best nucleophile in water? (a) I– (b) CH3SCH3 (c) CH3OCH3 (d) Cl–
Last Answer : I–
Description : 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 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
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
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
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.
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.
Description : Which of the following is not a nucleophile? (a) FeBr3 (b) Br– (c) NH3 (d) CH3OCH3
Last Answer : CH3OCH3
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+
Description : Which of the following is not a nucleophile? (a) NH3 (b) HSO3– (c) AlCl3 (d) HO–
Last Answer : AlCl3
Description : Which of the following is a nucleophile? (a) AlCl3 (b) H3O+ (c) BF3 (d) CN–
Last Answer : CN–
Description : Since air essentially behaves like a fluid, would it not be accurate to say, that aeroplanes swim through the air?
Last Answer : Fluid ≠ liquid. Gases and liquids are both fluids, as are plasmas. But swimming and drowning are ways of interacting with liquids specifically, not fluids generally.
Description : What type of person behaves this way and how can I help my children address it (Please see details)?
Last Answer : It depends on how frequent it is. If people are doing this frequently, they're only trying to mask their immature bullying (which they think they aren't doing). Teasing is such a norm that it' ... who I knew maybe sensitive or fragile, because it's like I'm voluntarily choosing to bully them.
Description : Can anyone explain why an aquarian girl behaves the way that she does ?
Last Answer : http://www.craigslist.org/about/best/van/152468438.html I found this interesting enough to bookmark. At last, a place for it! Not specific to an Aquarian…
Description : I think it's very sweet when they eat bread, especially when they eat it in bed. 333
Last Answer : I haven't seen one before. Is there a video somewhere like this?
Description : What will be n-factor for `Ba(MnO_(4))_(2)` in acidic medium? (Where it behaves as oxidant)
Last Answer : What will be n-factor for `Ba(MnO_(4))_(2)` in acidic medium? (Where it behaves as oxidant) A. 5 B. 10 C. 6 D. 3