Description : Homolytic fission of covalent bond between carbon atoms will produce : (a) Two carbonium ions (b) Two molecules (c) Free radicals (d) Carbonium ion and carbanion
Last Answer : Free radicals
Description : The mechanism of dehydration of an alcohol to give an ether involves formation of : (a) Carbonium ions (b) Carbanions (c) Free radicals (d) Carbenes
Last Answer : Carbonium ions
Description : The mechanism of dehydration of an alcohol to give an alkene involves formation of : (a) Carbonium ions (b) Carbanions (c) Free radicals (d) Carbenes
Description : An aqueous solution of glycine is neutral because of the formation of : (a) Carbanion (b) Zwitterion (c) Carbonium ions (d) Free radicals
Last Answer : Zwitterion
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 : In which of the following, homolytic bond fission takes place :
Last Answer : In which of the following, homolytic bond fission takes place : A. Nitration of benzene B. ... to double bond D. Free radical chlorination of methane
Description : Fermentation is a process of decomposition of an organic compound by (1) catalysts (2) enzymes (3) carbanions (4) free radicals
Last Answer : (2) enzymes Explanation: Fermentation in food processing typically is the conversion of carbohydrates to alcohols and carbon dioxide or organic acids using yeasts, bacteria, or a combination there ... to lactic acid. Alcoholic fermentation follows the same enzymatic pathway for the first 10 steps.
Description : Fermentation is a process of decomposition of an organic compound by : (1) catalysts (2) enzymes (3) carbanions (4) free radicals
Last Answer : enzymes
Description : When radiation breaks an electron pair bond in a molecule and each fragment of the molecule gets one of the bond electrons, the molecular fragments that are formed are called: w) ions x) free radicals y) stable molecules z) gases
Last Answer : ANSWER: X -- FREE RADICALS
Description : `CH_(3)CH_(2)Cl` undergoes homolytic fission produces:
Last Answer : `CH_(3)CH_(2)Cl` undergoes homolytic fission produces: A. `CH_(3)overset(.)CH_(2) and Cl^(.)` B. `CH_(3) ... )` D. `CH_(3)overset(.)CH_(2) and Cl^(-)`
Description : The order of stability of carbonium ions is (a) tertiary > secondary > primary (b) secondary > tertiary > primary (c) primary > secondary > tertiary (d) primary > tertiary > secondary
Last Answer : tertiary > secondary > primary
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 : The reaction intermediate produce by homolytic cleavage of bond is called,
Last Answer : The reaction intermediate produce by homolytic cleavage of bond is called, A. carbocations B. carbanions C. free radicals D. carbenes
Description : In which of the following compounds, the `C-Cl` bond ion-isation shall give most stable carbonium ion?
Last Answer : In which of the following compounds, the `C-Cl` bond ion-isation shall give most stable carbonium ion? A. B. C. D.
Description : Hydrogen and chlorine react vigorously in the presence of light (explosively) due to the formation of (a) Hydrogen-free radicals (b) Chlorine-free radicals (c) Hydrogen chloride molecule (d) Both hydrogen- and chlorine-free radicals
Last Answer : Ans:(b)
Description : The order of stability of carbanions is (a) primary > secondary > tertiary (b) secondary > tertiary > primary (c) tertiary > secondary > primary (d) tertiary > primary > secondary
Last Answer : primary > secondary > tertiary
Description : Characteristic reactions of aromatic hydrocarbons are initiated by (a) Electrophiles (b) Nucleophiles (c) Free radicals (d) Uncharged molecules
Last Answer : Electrophiles
Description : In the chlorination of alkanes, the first step in which chlorine free radicals are produced is called : (a) initiation (b) activation (c) propagation (d) deactivation
Last Answer : initiation
Description : What is Carbonium Ion ?
Last Answer : Organic ions with positively charged carbon atoms are called 'carbonium' ions.
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 : 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 bonds in Ethyl alcohol (CH3CH2OH) will undergo heterolytic bond fission most readily? (a) O–H (b) C–H (c) C–O (d) C–C
Last Answer : O–H
Description : Consider the following carbanions : Correct decreasing order of stability is :
Last Answer : Consider the following carbanions : Correct decreasing order of stability is : A. `II gt III gt IV gt I` B. ` ... gt III` D. `I gt II gt III gt IV`
Description : Consider the following carbanions: Correct decreasing order of stability is :
Last Answer : Consider the following carbanions: Correct decreasing order of stability is : A. II gt III gt I gt IV B. III ... II gt III D. I gt II gt III gt IV
Description : Arrange the carbanions, `(CH_(3))_(3)bar(C),bar(C)Cl_(3),(CH_(3))_(2)bar(C)H,C_(6)H_(5)bar(C)H_(2)`, in order of their decreasing stability
Last Answer : Arrange the carbanions, `(CH_(3))_(3)bar(C),bar(C)Cl_(3),(CH_(3))_(2)bar(C)H,C_(6)H_(5)bar(C)H_(2 ... (2)bar(C)HgtC_(6)H_(5)bar(C)H_(2)gtbar(C)Cl_(3)`
Description : Which one of the following carbanions is the least stable?
Last Answer : Which one of the following carbanions is the least stable? A. `CH_(3)CH_(2)^(-)` B. `HC-=C^(-)` C. `CH_(3)^(-)` D. `(CH_(3))_(3)barC`
Description : Arrange the following carbanions in decreasing orde of stability: `HC-=bar(C)(I)," "H_(3)C-C-=bar(C)(II),` `H_(2)C=bar(C)H(III)," "H_(3)C-bar(C)H_(2)(
Last Answer : Arrange the following carbanions in decreasing orde of stability: `HC-=bar(C)(I)," "H_(3 ... `IIgtIgtIIIgtIV` C. `IVgtIIIgtIIgtI` D. `IgtIIgtIIIgtIV`
Description : Are "mines" a fitting metaphor for "free radicals"?
Last Answer : I would think of free radicals as a rusting of the body.
Description : Arrange the following free radicals in increasing order of stability:
Last Answer : Arrange the following free radicals in increasing order of stability:
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 : Arrange the following free radicals in order of decreasing stability: Methyl(I), Vinly(II), Allyl(III), Benzyl(IV)
Last Answer : Arrange the following free radicals in order of decreasing stability: Methyl(I), Vinly(II), Allyl(III), Benzyl(IV) ... gt III D. IV gt III gt I gt II
Description : The increasing order of stability of the following free radicals is :
Last Answer : The increasing order of stability of the following free radicals is : A. `(CH_(3))_(2)overset(.)CHlt(CH_(3)) ... (.)Clt(C_(6)H_(5))_(2)overset(.)CH`
Description : Due to the presence of an unpaired electron, free radicals are:
Last Answer : Due to the presence of an unpaired electron, free radicals are: A. chemically reactive B. chemically inactive C. anions D. cations
Description : Which of the following orders regarding relative stability of free radicals is correct?
Last Answer : Which of the following orders regarding relative stability of free radicals is correct? A. `3^(@)lt2^(@)lt1^(@)` B. ... (@)` D. `3^(@)gt2^(@)lt1^(@)`
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 : Answer: a, b, c, d Free oxygen radicals are chemical species that are intermediates in the normal process of cellular respiration. Oxidants that are free radicals have been implicated as initiators of ... a. C-reactive protein b. Serum amyloid c. a -Proteinase inhibitor d. Fibrinogen e. Albumin
Last Answer : Answer: a, b, c, d The acute-phase response is a series of homeostatic responses of the organism to tissue injury in infection and inflammation. After an inflammatory stimulus occurs, a number ... 30% to 50% of the level before injury. The reason for the decrease in production is poorly understood
Description : Antioxidants help a person maintain good health because they (a) prevent the vitamins deficiency. (b) prevent excessive oxidation of glucose and other carbohydrates. (c) neutralise the free radicals ... metabolism. (d) activate certain genes in the body cells which help delay the ageing process.
Last Answer : Ans:(c)
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 : H2O2 is precursor of A A. free radicals B. Enzyme C. Both D. None of these
Last Answer : free radicals
Description : Cell membrane damage can occur by C A. free radicals B. Phopholipase C. all of above D. None of these
Last Answer : all of above
Description : The compound which give the most stable carbonium ion on dehydration is
Last Answer : The compound which give the most stable carbonium ion on dehydration is A. `CH_(3) - underset(CH_(3)) ... underset(OH)underset(|)(CH)-CH_(2)CH_(3)`
Description : (A) Heterolytic fission involves the breaking of a covalent bond in such a way that both the electrons of the shared pair are carried away by one of t
Last Answer : (A) Heterolytic fission involves the breaking of a covalent bond in such a way that both the electrons of ... IF (A) is incorrect but (R) is correct.
Description : Which one of the following statements does NOT apply to bacterial reproduction? a. A fission ring apparatus is present. b. Septum formation occurs. c. A spindle apparatus is used. d. Symmetrical cell division occurs.
Last Answer : c. A spindle apparatus is used.
Description : What is a type of bond in which positive and negative charged ions attract each other in an ionic bond?
Last Answer : That is called an ionic bond or coulombic attraction.
Description : What is a bond formed by the electrical attraction between two oppositely charged ions is a(n) .?
Last Answer : This is an ionic bond.
Description : What type of strong bond that forms between ions with opposite charges?
Last Answer : What is the answer ?
Description : Which of the following statement(s) is/are true concerning translation of the mRNA message to protein synthesis? a. An adaptor molecule, tRNA, recognizes specific nucleic acid bases and unites them ... and the free amino acid occurs in the free cytoplasm d. Complete protein synthesis takes hours
Last Answer : Answer: a, b The synthesis of protein involves conversion from a four-letter nucleotide language to one of 20 chemically distinct amino acids. This process is referred to as ... translation and be moving down the mRNA molecules simultaneously, thus increasing the rate of protein synthesis