Description : Curved arrows are used in Organic Chemistry to show the moment of electrons in the mechanism of a reaction . The correct product of the following rect
Last Answer : Curved arrows are used in Organic Chemistry to show the moment of electrons in the mechanism of a reaction . ... of the following rection is B. C. D.
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 : When dipentyl ether is treated with excess HI, through what type of mechanism(s) does the major product result? (a) SN2 (b) SN1 (c) E1 (d) E2
Last Answer : SN2
Description : The acid-catalyzed dehydration mechanism for alcohols is best described as a(n) : (a) E1 . (b) E2 . (c) SN1 (d) SN2
Last Answer : E1 .
Description : In which of the branches of chemistry would the development of a theory about how a reaction takes place best be carried o w) analytical x) inorganic y) organic z) physical
Last Answer : ANSWER: Z -- PHYSICAL
Description : In a consecutive reaction system of the given figure bellow, when E1 is much greater than E2 , the yield of B increases with the (A) Increase of temperature (B) Decrease of temperature (C) Increase in initial concentration of A (D) Decrease in initial concentration of A
Last Answer : (A) Increase of temperature
Description : Predict the two most likely mechanisms for the reaction of 2-iodohexane with sodium ethoxide. (a) SN2 and SN1 (b) E1 and E2 (c) SN2 and E2 (d) E1 and SN1
Last Answer : SN2 and E2
Description : Which of the following halides is least reactive in an E2 reaction with sodium methoxide? (a) (CH3)3CCH2I (b) (CH3)2CHCHICH3 (c) (CH3)2CHCH2Br (d) (CH3)2CHCH2Cl
Last Answer : (CH3)3CCH2I
Description : Which of the following halides is most reactive in an E2 reaction with sodium methoxide? (a) (CH3)3CCH2I (b) (CH3)2CHCHICH3 (c) (CH3)2CHCH2Br (d) (CH3)2CHCH2C
Last Answer : (CH3)2CHCHICH3
Description : The first attempt to solve of mechanism of organic evolution was made by `:`
Last Answer : The first attempt to solve of mechanism of organic evolution was made by `:` A. Haeckel B. De Vries C. Lamarck D. Darwin
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 : Which of the following factors does not govern the mechanism of petroleum formation from organic sources? (A) pH of the soil (B) Bacterial action (C) Heat (D) Pressure
Last Answer : (A) pH of the soil
Description : Father of Organic Chemistry?
Last Answer : Friedrich Wohler
Description : Write a note on the significance of organic chemistry.
Last Answer : Organic chemistry is used in biochemistry especially in the pharmaceutical industry and petro-chemistry. It is used as dyes, flavours, detergents, perfumes, cosmetics.
Description : What is organic chemistry?
Last Answer : Organic chemistry is the study of compounds and reactions involving carbon. OR It is the study of chemistry of carbon compounds of both natural and synthetic origin.
Description : Do you know any online universities that offer organic chemistry?
Last Answer : Athabasca university.
Description : Where in the U.S. can I take a whole year of Organic Chemistry in one summer?
Last Answer : most colleges/universities in the U.S. offer multiple sessions of basic courses during summers, and also during what's called "intersession" which is a brief session that's offered immediately after the ... . especially as a med school pre-req could easily be completed during a summer. Good luck.
Description : What is the difference in the molecular formula of any two consecutive members of a homologous series of organic compounds? -Chemistry
Last Answer : —CH2— is the difference in the molecular formula of any two consecutive members of a homologous series of organic compounds.
Description : What is Organic Chemistry ?
Last Answer : Organic chemistry is a branch of chemistry that deals with the formation , properties , attachments, and synthesis of hydrocarbons and their derivatives .
Last Answer : : The branch of chemistry that deals with the chemistry of hydrocarbons and hydrocarbon species, i.e. structure , preparation , religion , identification, etc. , is called organic chemistry.
Last Answer : Organic chemistry is a branch of chemistry that deals with the formation , properties , attachment, and preparation or synthesis of hydrocarbons and hydrocarbon molecules.
Last Answer : Frederick Wheeler, father of organic chemistry
Description : Which is the best organic chemistry book?
Last Answer : There are so many good books for organic chemistry for Bsc. and Msc. level for example "Organic chemistry' 1- by Crame and Hamand, 2- by Robert and Cassirio, 3- by I.L, finar. for reaction mechanism is a book by Peter and Sykes.
Description : Organic chemistry involves molecules that contain which element? a. carbon c. oxygen b. nitrogen d. calcium
Last Answer : a. carbon
Description : De Broglie equation is (a) h/mv = 1 (b) E1 – E2 = hv (c) C = 1v (d) n1 = 2d sin q
Last Answer : Ans:(a)
Description : The de Broglie equation is (a) h/mv = 1 (b) hv = E2 - E1 (c) n 1 = 2d sin (d) c = hv
Description : There are three events E1, E2 and E3, one of which is must and only one can happen. -Maths 9th
Last Answer : Since one and only one of the three events E1, E2 and E3 can happen, i.e, they are mutually exclusive. Therefore, P(E1) + P(E2) + P(E3) = 1 ...(i) Odds against E1 are 7 : 4 ⇒ Odds in favour of E1 are 4 : 7⇒ ... \(rac{1-rac{23}{88}}{rac{23}{88}}\) = \(rac{rac{65}{88}}{rac{23}{88}}\) = 65 : 23.
Description : If the three independent events E1, E2 and E3, the probability that only E1 occurs is α, E2 occurs -Maths 9th
Last Answer : (c) 6Let \(x\), y, z be the probabilities of happening of events E1, E2 and E3 respectively. Then, \(\alpha\) = P (occurrence of E1 only) = x (1 - y) (1 - z) \(\beta\) = P (occurrence of E2 only) = (1 - \(x\)) y (1 - ... (x\) = 6z (From (i) and (ii))⇒ \(rac{x}{z}\) = 6 ⇒ \(rac{P(E_1)}{P(E_3)}\) = 6.
Description : Which of the following statement(s) is/are true concerning the vascular response to injury? a. Vasoconstriction is an early event in the response to injury b. Vasodilatation is a ... Histamine, prostaglandin E2 (PGE2) and prostacyclin (PGI2) are important mediators of local vasoconstriction
Last Answer : Answer: a After wounding, there is transient vasoconstriction mediated by catecholamines, thromboxane, and prostaglandin F2 (PGF2a). This period of vasoconstriction lasts for only five to ten minutes. Once ... and mast cells and enhance the egress of cells and substrate into the wound and tissue
Description : The following prostanoid is a potent inducer of platelet aggregation (a) Prostacyclin (b) Prostaglandin E2 (c) Prostaglandin D2 (d) Thromboxane A2
Last Answer : Ans: D
Description : The prostanoid that consistently constricts blood vessels is (a) Prostaglandin E2 (b) Prostaglandin F2a (c) Thromboxane A2 (d) Prostacyclin
Last Answer : Ans: C
Description : Which of the following eicosanoids is generated through the lipozygenase pathway ? (a) Prostaglandin E2 (b) Thromboxane A2 (c) Prostacyclin (d) Leukotriene C4
Description : A 60-year-old woman has glaucoma following cataract surgery. Which of the following can be used to reduce intraocular pressure? (a) Leukotriene LTD4 or its analogs (b) Prostaglandin E2 or its analogs ( ... analogs (d) Slow-reacting substance of anaplylaxis (SRS-A) (e) Thromboxane A2 or its analogs
Description : As shown in the illustration, the circuit has been on the line for several days when component 'E1' burns out. The operator receives an alarm, switches over 'B' to energize the standby ... than required for the circuit therefore limiting the current through the alarm relay which will not pick up
Last Answer : Answer: D
Description : As shown in the illustration, what maintenance would be required of the circuit components? EL-0058 A. Change out both 'C' units monthly. B. Clean the glass surrounding 'E1' & 'E2' as needed. C. File ... upper end of 'G' every six months. D. Take megger readings on 'E1' & 'E2' windings quarterly.
Last Answer : Answer: B
Description : As shown in the illustration, the same indication occurs when 'C' opens as when ____________. EL-0058 A. 'E2' burns out B. 'H2' opens C. 'G' opens D. 'F' burns out
Last Answer : Answer: A
Description : As shown in the illustration, what happens when 'A' is closed, 'B' is in position '2' and component 'E2' burns out? EL-0058 A. 'H' energizes and 'D' makes contact. B. 'F' goes out allowing 'G' to disconnect. C. 'G' sounds an alarm and 'F' illuminates. D. 'C' opens causing 'A' to also open.
Last Answer : Answer: C
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 : Predict the two most likely mechanisms which occur when 2-iodohexane is heated in ethanol. (a) SN2 and SN1 (b) E1 and E2 (c) SN2 and E2 (d) E1 and SN1
Last Answer : E1 and SN1
Description : Dehydrohalogenation of 2-bromobutane in the presence of a strong base proceeds via which of the following mechanistic pathways? (a) SN1 (b) SN2 (c) E1 (d) E2
Last Answer : E2
Description : An atomic energy state in which more atoms are in the lower energy state E1 than in the excited state E2, is known as a) population inversion b) normal population c) stimulated population d) atomic population
Last Answer : b) normal population
Description : The emission in which the atom emits a photon of energy hf = E2 – E1 , in any arbitrary direction is a) Spontaneous emission b) stimulated emission c) induced emission d) both a & c
Last Answer : d) both a & c
Description : The incident photon absorbed by an atom in the ground state E1, thereby leaving the atom in the excited state E2 , is a) spontaneous absorption b) stimulated absorption c) induced absorption d) both b & c
Last Answer : d) both b & c
Description : Electric power a. V×I b. W/t c. V 2 /I d. E2 /t
Last Answer : . V×I
Description : Select the drug that has been used to suppress labour: A. Atropine B. Ritodrine C. Prostaglandin E2 D. Progesterone
Last Answer : B. Ritodrine
Description : The drug of choice for controlling postpartum haemorrhage is: A. Oxytocin B. Methylergometrine C. Dihydroergotamine D. Prostaglandin E2
Last Answer : B. Methylergometrine
Description : 6 In a two winding transformer, the primary and secondary induced emf E1 & E2 are always A. equal in magnitude B. anti phase with each other C. in phase with each other D. determined by load on transformer secondary
Last Answer : C. In phase with each other
Description : Prolonged airway hyperreactivity is characteristically caused by: A. Histamine B. Prostaglandin E2 C. Platelet activating factor D. Bradykinin
Last Answer : C. Platelet activating factor
Description : The following drug is used for cervical priming to facilitate labour: A. Oxytocin B. Clomiphene C. Progesterone D. Prostaglandin E2
Last Answer : D. Prostaglandin E2
Description : The following prostanoid is a potent inducer of platelet aggregation: A. Prostacyclin B. Prostaglandin E2 C. Prostaglandin D2 D. Thromboxane A2
Last Answer : D. Thromboxane A2