Description : When ethanol is heated with concentrated H2SO4, a gas is produced. Which of the following compounds is formed when this gas is treated with bromine in CCl4?E2 (a) Bromomethane (b) 1,2-Dibromoethane (c) Bromoethane (d) 1,1,2,2-Tetrabromoethane
Last Answer : 1,2-Dibromoethane
Description : Which halogen does not appreciably react with methane in a free-radical substitution reaction? (a) chlorine (b) bromine (c) iodine (d) fluorine
Last Answer : iodine
Description : Chlorine free radicals react with methane by : (a) donating their free-radical electron to methane to form chloromethane. (b) abstracting a hydrogen atom from methane, and producing ... produce chloromethane. (d) forming a carbonium ion intermediate that rapidly dissociates to form chloromethane
Last Answer : abstracting a hydrogen atom from methane, and producing HCl and a methyl radical
Description : The chlorination of methane to give CCl4 is an example of (a) an electrophilic addition (b) a free-radical substitution (c) a nucleophilic addition (d) an electrophilic substitution
Last Answer : a free-radical substitution
Description : Chlorination of an alkane as compared to bromination proceeds (a) at a slower rate (b) at a faster rate (c) with equal rates (d) with equal or different rate depending upon the source of alkane
Last Answer : at a faster rate
Description : In which amongs the following product is formed by free radical mechanism ?
Last Answer : In which amongs the following product is formed by free radical mechanism ? A. (I) (ii) (P) B. (IV) (ii) (Q) C. (II) (iii) (Q) D. (III) (iii) (P)
Description : The reaction between methane and chlorine in diffused sunlight is-----? A. Oxidation B. Reduction C. Polymerisation D. Radical substitution (Answer)
Last Answer : D. Radical substitution (Answer)
Description : On bromination, the electron rich phenoxide ion will be attacked most readily
Last Answer : On bromination, the electron rich phenoxide ion will be attacked most readily A. on the negatively ... carbon atom D. on the ortho carbon atom.
Description : What is Free Radical ?
Last Answer : Free radical: Any species with odd electrons is called free radical.
Last Answer : : An atom or radical with an odd electron resulting from the equilibrium-breaking of a covalent sigma bond is called a free radical.
Description : What is free radical ?
Description : Write the name of reagent use for initating a free radical chain reaction.
Last Answer : Ans: Tertiary Butyle peroxaide.
Description : Why should one always use purest monomer in free radical polymerization?
Last Answer : Ans: The impurities present in monomer may combine with free radical that slow the rate of polymerization.
Description : Why should we always use purest monomer in free radical mechanism ?
Last Answer : Ans. Monomer has to be as pure as possible because the presence of any other molecule during free radical polymerisation can act chain initiator or inhibitor which will interfere with the normal polymerisation reaction.
Description : Which of the following characterizes the reactions of aldehydes and ketones? (a) electrophilic addition (b) electrophilic substitution (c) nucleophilic acyl substitution (d) nucleophilic addition; free radical addition
Last Answer : nucleophilic addition; free radical addition
Description : What is the name given for a species that contains a positively charged carbon atom? (a) carbanion (b) carbocation (c) methyl radical (d) free radical
Last Answer : carbanion
Description : 30. Radical centre of circles drawn on the sides as a diameter of triangle formed by the lines the `3x-4y+6=0`, `x-y+2=0` and `4x+3y-17=0` is
Last Answer : 30. Radical centre of circles drawn on the sides as a diameter of triangle formed by the lines the `3x-4y+6=0`, `x-y+ ... . (-2,3) C. (-2,-3) D. (2,3)
Description : Propyne is formed by (a) Polymerization of acetylene (b) Reaction of acetylene with methane (c) Reaction of acetylene with methyl chloride (d) Reaction of sodium acetylide with methyl chloride
Last Answer : Reaction of sodium acetylide with methyl chloride
Description : Find the total number of acidic radical which produce volatile product with dil HCl : `(i) SO_(4)^(2-) " " (ii) I^(-) " " (iii) NO_(2)^(-) " " (iv) NO
Last Answer : Find the total number of acidic radical which produce volatile product with dil HCl : `(i) SO_(4)^(2-) " " (ii) ... SO_(3)^(2-) " " (vi) HCO_(3)^(-)`
Description : A waste product in the metabolism of glucose in cells is: w) oxygen x) methane y) carbon dioxide z) urea
Last Answer : ANSWER: C -- CARBON DIOXIDE
Description : The stablest free radical among the following is :
Last Answer : The stablest free radical among the following is : A. `CH_(3)overset(.)CH_(2)` B. `CH_(3)-overset(.)CH_(2) ... ` D. `C_(6)H_(5)-overset(.)CH_2-CH_(3)`
Description : Which of the following is true about the cycloheptatrienyl free radical ?
Last Answer : Which of the following is true about the cycloheptatrienyl free radical ? A. it is an isolated stable ... `4n+2pi` electrons D. none of the above.
Description : (A) Allyl free radical is more stable than simple alkyl free radical. (R) The allyl free radical is stabilized by resonance.
Last Answer : (A) Allyl free radical is more stable than simple alkyl free radical. (R) The allyl free radical is ... IF (A) is incorrect but (R) is correct.
Description : (A) Carbenes act as free radicals. (R) Only triplet carbenes act as biradical (divalent free radical).
Last Answer : (A) Carbenes act as free radicals. (R) Only triplet carbenes act as biradical (divalent free radical). A. ... IF (A) is incorrect but (R) is correct.
Description : Which of the following is a free radical substitution reaction?
Last Answer : Which of the following is a free radical substitution reaction? A. `CH_(3)CHO+HCNrarrCH_(3)CH(OH)CN` B. C. D.
Description : Which one of the following reactions proceeds through free radical chain mechanism?
Last Answer : Which one of the following reactions proceeds through free radical chain mechanism? A. Hydrolysis of tert- ... D. Addition of `NaHSO_(3)` on acetone
Description : Which of the following statement(s) is/are true concerning ischemia reperfusion injury? a. During ischemia, ATP degradation results in increased plasma and intracellular levels of ... immunization with antibodies to neutrophil adhesive complex lessen the ischemic/reperfusion microvascular injury
Last Answer : Answer: a, b, c, d During the ischemia and hypoperfusion phase, degradation of ATP stores essential to maintain cell integrity and significant loss of diffusible ... either the neutrophil adhesive complex or the endothelial selectins dramatically lessens ischemia/reperfusion microvascular injury
Description : How do you define free radical addition reaction ?
Last Answer : Give an example. When unsaturated compounds undergo addition reactions with free radicals, it is called free radical addition reaction. Ex; CH3-CH = CH2+HBr-----------> CH3-CH2-CH2Br
Description : Chain growth polymerisation is a process, in which the monomers are added in a chain fashion, and it requires an initiator to produce the free radical. An example of chain growth polymerisation products is (A) Nylon-66 (B) Teflon (C) Polyester (D) Bakelite
Last Answer : (B) Teflon
Description : Addition polymerisation takes place either by a free radical mechanism or ionic mechanism depending on the reagents used. Free radical polymerisation is catalyzed by __________, which decompose to give free radicals. (A) Organic peroxides (B) Sulphuric acid (C) Hydrofluoric acid (D) None of these
Last Answer : (A) Organic peroxides
Description : N-acetyl cysteine is beneficial in acute paracetamol poisoning because: A. It reacts with paracetamol to form a nontoxic complex B. It inhibits generation of the toxic metabolite of ... scavenger D. It replenishes hepatic glutathione which in turn binds the toxic metabolite of paracetamol
Last Answer : D. It replenishes hepatic glutathione which in turn binds the toxic metabolite of paracetamol
Description : Define: (a) Radical (b) Valency (c) Molecular formula
Last Answer : (a) Radical: A radical is an atom of an element or a group of atoms of different elements that behaves as a single unit with a positive or negative charge on it. (b) Valency: It is the ... number of atoms of each element present in it. These atoms combine in whole number to form the molecule.
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.
Description : In the addition of hydrogen bromide to alkynes, which of the following species is believed to be an intermediate? (a) vinyl anion (b) vinyl cation (c) vinyl radical (d) carbene
Last Answer : vinyl cation
Description : Marsh gas, formed from decaying organic matter and in coal mines is (a) carbon dioxide (b) methane (c) ethane (d) carbon monoxide
Last Answer : Ans:(b)
Description : Which hydrocarbon is formed by the action of sodium on ethyl iodide? (a) Methane (b) Ethane (c) Ethylene (d) Butane
Last Answer : Ans:(d)
Description : What is formed by the mixture of hy- drogen; methane and carbon monoxide?
Last Answer : Coal gas
Description : Pick out the wrong statement. (A) Addition of methane to the furnace atmosphere reduces decarburising by hydrogen (B) Nitrogen in presence of steam decor-burises high carbon steel, whereas hydrocarbon ... the metal surface) cause nitride formation with increase in surface hardness (D) None of these
Last Answer : (D) None of these
Description : Name the product obtained when methane and chlorine is exposed to ultraviolet light (sunlight).
Last Answer : When a mixture of methane and chlorine is exposed to ultraviolet light, chloromethane is formed.
Description : In the first stage of photosynthesis, light energy splits water molecules leaving a by-product which is released. This byproduct is: a) hydrogen b) carbon dioxide c) oxygen d) methane
Last Answer : ANSWER: C -- oxygen
Description : In your opinion do you really believe that stricter gun laws will stop these radical mass shootings?
Last Answer : But the black market will really boom, by making them illegal,the underworld will totally prosper,is that another form of privatization?
Description : Out of all US Presidents, which has had to deal with the most difficult radical groups? Worldwide- what would be your country's answer when applied ?
Last Answer : Abraham Lincoln.
Description : FIFA's problems can be fixed with radical surgery. Just remove the Blatter.
Last Answer : Make him serve those that he wronged.
Description : What should I start doing now to prepare myself for a radical shift in social lifestyle in college?
Last Answer : answer:I think you have some misconceptions about college. First off, the alcohol. Seek it out, and you'll definitely find large amounts of alcohol, or don't, and nobody will care or notice. ... different perspective of college than those real college students. Or I may be right. Who knows.
Description : What is being done to change the opinions of radical islamists?
Last Answer : How do you tell someone that what they believe in is wrong? You can’t. Especially if they have no belief in anything else.
Description : What would be a radical change that you would welcome in your life?
Last Answer : A 50% increase in trusting myself! That change would be welcome, and is waaaaaay overdue.
Description : "Radical Honesty": What do you think?
Last Answer : Did you just watch The Colbert Report?
Description : I heard the host of BBC World today claim that it's "radical" to say that resources of the Amazon rainforest shouldn't be exploited. Is this the kind of bile we call news?
Last Answer : If you think that's bad, wait till you hear of Fox News. Unfortunately, there are no journalism laws. There is no requirement to present the truth and only the truth-especially when the truth changes such as ... book or in a news segment. I look at the data itself and make my decision based on that.