(A) Nucleophiles attack the regions of high electron density. (R) Nucleophiles act as Lewis bases.

(A) Nucleophiles attack the regions of high electron density. (R) Nucleophiles act as Lewis bases.
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(A) Nucleophiles attack the regions of high electron density. (R) Nucleophiles act as Lewis bases. A. If ... IF (A) is incorrect but (R) is correct.
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Which of the following statements is correct regarding nucleophiles? (a) They have an overall positive charge(b) They have a lone-pair of electrons(c) They have an unpaired electron(d) They have empty orbitals

Description : Which of the following statements is correct regarding nucleophiles? (a) They have an overall positive charge (b) They have a lone-pair of electrons (c) They have an unpaired electron (d) They have empty orbitals

Last Answer : (b) They have a lone-pair of electrons

Do you expect the carbon hydride of the type (CnH2n+2) to acts as Lewis acid or bases? Justify your answer

Description : Do you expect the carbon hydride of the type (CnH2n+2) to acts as Lewis acid or bases? Justify your answer

Last Answer : Ans: carbon hydride of the types(CnH2n+2)are electron-precise hydrides. In other words they have exact number of electron to form covalent bonds therefore they do not show any tendency to either gain or lose electron hence they are neither Lewis acid or Lewis bases.

Ethers are (a) Lewis acids(b) Neutral(c) Lewis bases(d) Can not be predicted

Description : Ethers are (a) Lewis acids (b) Neutral (c) Lewis bases (d) Can not be predicted

Last Answer : Lewis bases

Which of the following are Lewis bases? (a) NF3 (b) BF3 (c) CH3OCH3 (d) (a) and (c

Description : Which of the following are Lewis bases? (a) NF3 (b) BF3 (c) CH3OCH3 (d) (a) and (c

Last Answer : (a) and (c

Phenol is an ortho-para director because the hydroxyl group : (a) donates electrons that increase electron density at ortho and para positions favoring nucleophilic attack. (b) donates electrons that increase electron density at ortho and para positions favoring electrophilic attack. (c) donates electrons to the ortho and para positions and attracts electrons away from meta positions favoring nucleophilic attack of the ring. (d) donates electrons to the ortho and para positions and attracts electrons away from meta positions favoring electrophilic attack on the ring.

Description : Phenol is an ortho-para director because the hydroxyl group : (a) donates electrons that increase electron density at ortho and para positions favoring nucleophilic attack. (b) donates ... para positions and attracts electrons away from meta positions favoring electrophilic attack on the ring.

Last Answer : donates electrons that increase electron density at ortho and para positions favoring electrophilic attack.

Hydrogen atom electron is excited to n = 4 state , in the spectrum of emitted radiation , number of lines in the ultravoilet and visible regions are r

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Last Answer : Hydrogen atom electron is excited to n = 4 state , in the spectrum of emitted radiation , number of lines in the ... 1 , 3 C. 2 , 3 D. 3 , 2

What purpose does FeCl3 serve in the electrophilic aromatic substitution reaction between chlorine and benzene? (a) It serves as a radical initiator to produce the chlorine radical needed to propagate the chain reaction. (b) It functions by destabilizing the carbocationic intermediate and thereby increases the rate of H+ loss. (c) It serves as a Lewis base catalyst by reacting with Cl2 to generate chloride ions. (d) It serves as a Lewis acid catalyst by reacting with the Cl2 and thereby activates it toward attack by benzene’s π electrons.

Description : What purpose does FeCl3 serve in the electrophilic aromatic substitution reaction between chlorine and benzene? (a) It serves as a radical initiator to produce the chlorine radical needed to propagate the ... by reacting with the Cl2 and thereby activates it toward attack by benzene's π electrons.

Last Answer : It serves as a Lewis acid catalyst by reacting with the Cl2 and thereby activates it toward attack by benzene’s π electrons.

Arrange the following nucleophiles in the order of their nucleophilic strength.

Description : Arrange the following nucleophiles in the order of their nucleophilic strength.

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`CH_(3)Br+Nu^(-)rarrCH_(3)Nu+Br^(-)` The decreasing order of the rate of the above reaction with nucleophiles `(Nu^(-))` A to D is : `[Nu^(-)=(A)PhO^(

Description : `CH_(3)Br+Nu^(-)rarrCH_(3)Nu+Br^(-)` The decreasing order of the rate of the above reaction with nucleophiles `(Nu^(-))` A to D is : `[Nu^(-)=(A)PhO^(

Last Answer : `CH_(3)Br+Nu^(-)rarrCH_(3)Nu+Br^(-)` The decreasing order of the rate of the above reaction with nucleophiles `(Nu ... B gt C gt D D. B gt D gt C gt A

Which of the following statements is not correct for a nucleophiles?

Description : Which of the following statements is not correct for a nucleophiles?

Last Answer : Which of the following statements is not correct for a nucleophiles? A. Nucleophiles are not electron ... a Lewis acid D. Ammonia is a nucleophile

What are ambident nucleophiles?

Description : What are ambident nucleophiles?

Last Answer : Nucleophiles which can attack through two different sites arecalled ambident nucleophiles. For example, cyanide ion is aresonance hybrid for its structure. It can attack either throughcarbon to form cyanides or through N to form isocyanides orcarbylamines.

Characteristic reactions of aromatic hydrocarbons are initiated by (a) Electrophiles (b) Nucleophiles (c) Free radicals (d) Uncharged molecules

Description : Characteristic reactions of aromatic hydrocarbons are initiated by (a) Electrophiles (b) Nucleophiles (c) Free radicals (d) Uncharged molecules

Last Answer : Electrophiles

Which statement about the carbonyl group of ketones and aldehydes is true? I. It can attract nucleophiles. II. It can attract electrophiles. III. It tends to undergo addition reactions. IV. It tends to undergo substitution reactions. (a) I and III (b) II and IV (c) I, II, and III (d) I, III, and IV

Description : Which statement about the carbonyl group of ketones and aldehydes is true? I. It can attract nucleophiles. II. It can attract electrophiles. III. It tends to undergo addition reactions. IV. It tends to undergo substitution reactions. (a) I and III (b) II and IV (c) I, II, and III (d) I, III, and IV

Last Answer : I, II, and III

Which brief statement most accurately describes why alkenes react the way they do? (a) C=C double bonds are weak. (b) A π bond is lost but a stronger σ bond is gained. (c) C=C double bonds are unstable. (d) C=C π bonds are attacked by nucleophiles.

Description : Which brief statement most accurately describes why alkenes react the way they do? (a) C=C double bonds are weak. (b) A π bond is lost but a stronger σ bond is gained. (c) C=C double bonds are unstable. (d) C=C π bonds are attacked by nucleophiles.

Last Answer : A π bond is lost but a stronger σ bond is gained.

In molecule of calcium sulfide calcium has two valence electron bonds and a sulfur atom has six valence electrons. How many lone pairs of electrons are present in the Lewis structure of calcium?

Description : In molecule of calcium sulfide calcium has two valence electron bonds and a sulfur atom has six valence electrons. How many lone pairs of electrons are present in the Lewis structure of calcium?

Last Answer : What is the answer ?

A compound which is an electron pair donor is generally classified as a: w) Lewis acid x) Bronsted base y) Bronsted acid z) Lewis base

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Last Answer :  ANSWER: Z -- LEWIS BASE 

A substance that accepts an electron pair is classified as a: w) bronsted-lowry acid x) bronsted-lowry base y) lewis acid z) lewis base

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Last Answer : ANSWER: Y -- LEWIS ACID

Any species that acts as an electron-pair acceptor a: w) Lewis base x) Bronsted base y) Lewis acid z) Bronsted acid

Description : Any species that acts as an electron-pair acceptor a: w) Lewis base x) Bronsted base y) Lewis acid z) Bronsted acid

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Assertion: Phenol is more reactive than benzene towards electrophilic reactions. Reason : The +R effect of OH group increases the electron density on

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What links the auther j.k rowling, e.nesbit c.s. lewis ,and j.r.r tolkien?

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Answer: They are regions of space around the nucleus where the probability of finding an electron is maximum.

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The corret order of increasing basicity of the given conjugated bases `(R=CH_(3))` is :

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(A) Ether behaves as bases in the presence of mineral acids. (R ) Due to the presence of lone pair of electrons on oxygen.

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(A) Ether behaves as bases in the presence of mineral acids. (R ) Due to the presence of lone pair of electrons on oxygen.

Description : (A) Ether behaves as bases in the presence of mineral acids. (R ) Due to the presence of lone pair of electrons on oxygen.

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Intestinal nucleosidases act on nucleosides and produce (A) Purine base only (B) Phosphate only (C) Sugar only (D) Purine or pyrimidine bases and sugars

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Amphoteric substances: w) act as either bases or acids x) precipatate from aqueous solutions y) salt out of basic solutions z) form emulsions in oils

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For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because (A) Water has a high latent heat of evaporation (B) Lewis number is close to unity (C) They are always equal under all circumstances

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In pyrrole, The electron density is maximum on :

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At room temperature copper has free electron density of `8.4xx10^(28) per m^(3)` . The copper conductor has a cross-section of `10^(-6)m^(2)` and carr

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Mean drift velocity of electron in a copper wire having cross-sectional area 5.0 × 10-6 m2 carrying current of 1 A and having number density 8.5 × 1028 m3 is A. 0.015 mm s-1 B. 0.1 mm s-1 C. 0.5 mm s-1 D. 0.25 mm s-1

Description : Mean drift velocity of electron in a copper wire having cross-sectional area 5.0 × 10-6 m2 carrying current of 1 A and having number density 8.5 × 1028 m3 is A. 0.015 mm s-1 B. 0.1 mm s-1 C. 0.5 mm s-1 D. 0.25 mm s-1

Last Answer : 0.015 mm s-1

Number of conduction electrons per unit volume is A. electron number B. number density C. proton number D. neutron numbe

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Semiconductors have electron number density of order A. 1024 m-3 B. 1020 m-3 C. 1012 m-3 D. 1023 m-3

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An electron is travelling at right angles to a uniform magnetic field of flux density 1.2 mT with a speed of 8 × 106 m s-1, the radius of circular path followed by electron is A. 3.8 cm B. 3.7 cm C. 3.6 cm D. 3.5 cm

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Calculate the electric field when the conductivity is 20 units, electron density is 2.4 units and the velocity is 10m/s. Assume the conduction and convection current densities are same. a) 2.4 b) 4.8 c) 3.6 d) 1.2

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Find the electron density when convection current density is 120 units and the velocity is 5m/s. a) 12 b) 600 c) 24 d) 720

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Calculate the convection current when electron density of 200 units is travelling at a speed of 12m/s. a) 16.67 b) 2400 c) 2880 d) 0.0

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Which of the following is NOT a general property of hydroxide bases in aqueous solution? w) High solubility x) Bitter taste y) Ability to neutralize aqueous acid solutions z) Ability to change phenolphthalein from colorless to red

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I can't believe that the Republicans have the gall, to label The George Floyd Justice in Policing Act an "Attack against Police". Any one else shocked by the hypocrisy?

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Which of the following statements regarding the complement system are true? a. Complement activation yields products which are directly cytotoxic as well as products which act indirectly via activated leukocytes b. Complement products referred to as anaphylatoxins include C1, C3a, C4a, and C5a c. The principal role of C5a is in bacterial opsonization d. The alternative and classical pathways converge proximal to generating the membrane attack complex (C5b-9)

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Which of the following pertains to American involvement in World War II? (a) Lend Lease Act (b) Atlantic Charter (c) Japanese Attack on Pearl Harbour (d) All of these (e) None of these

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The angular momentum J of the electron in a hydrogen atom is proportional to `n^(th)` power of r (radius of the orbit) where n is :-

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(A) Ethyl chloride is more reactive than vinyl chloride towards nucleophilic substitution reactions. (R) Vinyl chloride is `+I` electron pushing group

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Conjugation of electron withdrawing groups, e.g., `-CHO`, `-overset(O)overset("|")C-R", "-overset(O)overset(||)C-OR", "-C-=N", "-NO_(2)` activates nuc

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An electron moving in a circular orbit of radius `r` makes `n` rotation per secound. The magnetic field produced at the centre has magnitude

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