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.
Description : Although — NH2 gp is an ortho and para directing gp, nitration of aniline gives along with ortho and para, meta derivatives also.
Last Answer : Nitration is carried out with a mixture of Conc. NO3 + Conc. H2 SO4 (nitrating mix). In the presence of these acids, most of aniline gets protonated to form anilinium ion. Therefore, in the ... is m-directing and deactivating hence a mixture of all three-ortho, para and meta derivatives is formed.
Description : Which of the following will undergo substitution in the ortho and para positions rather than in the meta position? (a) Nitrobenzene (b) Benzoic acid (c) Acetanilide (d) Benzaldehyde
Last Answer : Acetanilide
Description : Which of the following statements is false about toluene? (a) can be prepared by treating benzene with methyl chloride in the presence of AlCl3. (b) is converted to benzoic acid on refluxing with ... (d) can be nitrated with concentrated nitric acid to give a mixture of ortho and meta nitrotoluene.
Last Answer : can be nitrated with concentrated nitric acid to give a mixture of ortho and meta nitrotoluene
Description : Which of the following substituents is an ortho and para director and ring deactivating? (a) –NH2 (b) –Cl (c) –OCH3 (d) –OH
Last Answer : –Cl
Description : Which of the following statements are false about benzene? (a) It is a planar molecule with bond angles 120°. (b) It is immiscible with water forming the lower layer. (c) It can be ... Ni catalyst. (d) It reacts with ethyl chloride in the presence of aluminium chloride to form ethylbenzene.
Last Answer : It is immiscible with water forming the lower layer
Description : The `-NO_(2)` group in an aromatic ring deactivates the ortho and para positions for an electrophilic attack. When `-NO_(2)` group is present at ortho
Last Answer : The `-NO_(2)` group in an aromatic ring deactivates the ortho and para positions for an electrophilic attack. When ` ... product (I) is : A. B. C. D.
Last Answer : The `-NO_(2)` group in an aromatic ring deactivates the ortho and para positions for an electrophilic attack. When ` ... product (H) is : A. B. C. D.
Last Answer : The `-NO_(2)` group in an aromatic ring deactivates the ortho and para positions for an electrophilic attack. When ` ... product (G) is : A. B. C. D.
Description : While separating a mixture of ortho and para-nitro phenols by steam distillation, name the isomer which will be steam volatile. Give reasons.
Last Answer : In o-nitrophenol, there is intramolecular hydrogen bonding as follows : In p-nitrophenol, there is intramolecular hydrogen bonding as follows : Due to intermolecular H ... -nitrophenol. Hence o-nitraphenol due to its lower b. p. is steam volatile while pnitrophenol is not.
Description : Pick out the correct statement about catalytic polymerisation. (A) H2SO4 polymerisation process gives gasoline rich in unsaturates (B) In H2SO4 polymerisation, H3PO4 is always used with 2% steam to prevent meta & ortho H3PO4 formation, which are inactive (C) Both (A) and (B) (D) Neither (A) nor (B
Last Answer : (B) In H2SO4 polymerisation, H3PO4 is always used with 2% steam to prevent meta & ortho H3PO4 formation, which are inactive
Description : Reaction of ortho-phosphoric acid with phosphate rock produces (A) Superphosphate (B) Triple superphosphate (C) Meta-phosphoric acid (D) Monoammonium phosphate
Last Answer : (B) Triple superphosphate
Description : . Heating of ortho-phosphoric acid to about 900°C, produces (A) Meta-phosphoric acid (B) Pyrophosphoric acid (C) No change in it (D) None of these
Last Answer : (A) Meta-phosphoric acid
Description : Heating of ortho-phosphoric acid to 250°C produces (A) Meta-phosphoric acid (B) Pyrophosphoric acid (C) No change in it (D) None of these
Last Answer : (B) Pyrophosphoric acid
Description : In the manufacture of ortho-phosphoric acid by strong H2SO4 leaching wet process, keeping the reactor temperature above 100°C, results in the formation of undesirable (A) CaSO4 .½ H2O and CaSO4 crystals (B) Pyrophosphoric acid (C) Meta-phosphoric acid (D) All (A), (B) and (C)
Last Answer : (A) CaSO4 .½ H2O and CaSO4 crystals
Description : H3PO4 is the chemical formula of __________ phosphoric acid. (A) Pyro (B) Ortho (C) Meta (D) None of these
Last Answer : (B) Ortho
Description : HPO3 is the chemical formula of __________ phosphoric acid. (A) Pyro (B) Ortho (C) Meta (D) None of these
Last Answer : (C) Meta
Description : H4P2O7 is the chemical formula of __________ phosphoric acid. (A) Pyro (B) Ortho (C) Meta (D) None of these
Last Answer : (A) Pyro
Description : What is the balanced veratrole and nitric acid? Also, would you expect ortho-dimethoxybenzene or para-dimethoxybenzene to be nitrated more readily?
Last Answer : answer:1. Are you asking for the balanced equation? 2. What determines how easily something is nitrated? Draw out the two structures and look at them.
Description : The most suitable method of separation of a mixture of ortho and para nitrophenol in the ratio `1:1` is :
Last Answer : The most suitable method of separation of a mixture of ortho and para nitrophenol in the ... B. Distillation C. Sublimation D. Chromatography
Description : Which of the following can be made by the action of CH3Cl on benzene in the presence of aluminium chloride? (a) Ethylbenzene (b) o-Xylene (c) Chlorobenzene (d) m-Xylene
Last Answer : o-Xylene
Description : (A) Ethyl chloride is more reactive than vinyl chloride towards nucleophilic substitution reactions. (R) Vinyl chloride is `+I` electron pushing group
Last Answer : (A) Ethyl chloride is more reactive than vinyl chloride towards nucleophilic substitution reactions. (R) Vinyl ... A) is incorrect but (R) is correct.
Description : In electrophilic aromatic substitution reactions a chlorine substituent __________. (a) is a deactivator and a m-director (b) is a deactivator and an o,p-director (c) is an activator and a m-director (d) is an activator and an o,p-director
Last Answer : is a deactivator and an o,p-director
Description : Which of the reactions between the following pairs of reagents proceeds by a mechanism that may be described as an electrophilic substitution? (a) Benzene + Br2/FeBr3 (b) Propene + Br2 (c) Acetone + NH2NH2 (d) Ethyl bromide + aq KOH
Last Answer : Benzene + Br2/FeBr3
Description : Reimer-Tiemann reaction introduces an aldehyde group on to the aromatic ring of phenol, ortho to the hydroxyl group. This reacrtion involves electroph
Last Answer : Reimer-Tiemann reaction introduces an aldehyde group on to the aromatic ring of phenol, ortho to the hydroxyl group. ... (I) is: A. B. C. D.
Last Answer : Reimer-Tiemann reaction introduces an aldehyde group on to the aromatic ring of phenol, ortho to the hydroxyl group. This ... (2)` D. `.^(*)C Cl_(3)`
Last Answer : Reimer-Tiemann reaction introduces an aldehyde group on to the aromatic ring of phenol, ortho to the hydroxyl group. ... ` D. aq. `NaOH + C Cl_(4)`
Description : Which of the following reactions can be used to make ethyl isocyanide?
Last Answer : Which of the following reactions can be used to make ethyl isocyanide? A. `CH_(3)CH_(2)NH_(2) +CHCI_(3) ... POCI_(3))rarr` D. `CH_(3)CH_(2)Br+KCNrarr`
Description : Urea is prepared by the chemical reactions of (a) Ammonium sulphate and calcium chloride (b) Ammonia and carbon dioxide (c) Chlorine and water (d) Acetamide and ethyl alcohol
Last Answer : Ans: (b)
Description : In fermentation reactions occurring in yeast, two products of metabolism are ______ and ______. a. Acid; Hydrogen Gas b. Hydrogen Gas; Sucrose c. Ethyl Alcohol; Methane d. Carbon Dioxide; Ethyl Alcohol
Last Answer : a. Acid; Hydrogen Gas
Description : Can the amino group, in the aniline molecule, become meta-directing in an electrophilic substitution reaction ?
Last Answer : Can the amino group, in the aniline molecule, become meta-directing in an electrophilic substitution reaction ... D. Yes, in a non-polar solvent
Description : Ortho and paranitrophenols are more acidic than phanel. Draw the resonance structures of the corresponding phonoxide ion.
Last Answer : Ans:- Electronwithdrawal by nitro group makes the plenoxide ion more resonance stabilized and so the strength of phenel increases.
Description : Ortho phosphoric acid is triprotic but phosphoric acid is diprotic. Why?
Last Answer : Ans: Because of their structures ortho phosphoric acid and phosphoric acid have three and two ionisable hydrogen.
Description : Compounds with the same molecular formula but different structural formulas are called (a) Alkoxides (b) Iso compounds (c) Isomers (d) Ortho compounds
Last Answer : Isomers
Description : In an alkyl halide substitution of hydrogen by deuterium results in slow formation of ion pair. This is known as? a. Ortho effect b. Mesomeric effect c. Secondary kinetic isotope effect d. Primary kinetic isotope effect
Last Answer : c. Secondary kinetic isotope effect
Description : Which of the following describes the side chain of Leucine? (a) ethyl group (b) isopropyl group (c) sec-butyl group (d) isobutyl group
Last Answer : isobutyl group
Description : Which of the following describes the side chain for Valine? (a) ethyl group (b) hydrogen (c) isobutyl group (d) isopropyl group
Last Answer : isopropyl group
Description : Which of the following describes the side chain for Alanine? (a) hydrogen (b) ethyl group (c) methyl group (d) isopropyl group
Last Answer : methyl group
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 : Out of morphine, N-Acetyl-para-aminophenol, Diazepam and tetrahydrocatenol, which can be used as analgesic without causing addiction ?
Last Answer : Ans. N-Acetyl-para-aminophenol.
Description : The reflector and director of an antenna array are considered as A. Parasitic elements B. Transcendental elements C. Feed-points D. Driven elements
Last Answer : A. Parasitic elements
Description : An audit committee must be comprised of outside directors. Which of the following is considered an outside director? a. A consultant to the company. b. A member of company management. c. The company's independent auditor. d. A retired executive from another company
Last Answer : A retired executive from another company
Description : Side effects of ortho evra (or any other type of patch birth control)...
Last Answer : I would talk to your doctor. Also it has been advertised that Ortho Evra can have side effects leading to death. So if I were you I would also consult your doctor weather or not this medication is safe for you in general.
Description : using ortho max poison ivy and tough brush killer
Last Answer : Get someone to help you....find the root of the poison ivy......use full stength white vinegar on the root only to kill it....you might need to do this for several days in a row. Use a ... might need to put a stick on the root spot and vinegar it several time before winter comes to keep it dead.
Description : Moynul namer ortho? What is the meaning of the name Mainul ?
Last Answer : Answer : The name Ma'inul means water flowing on the surface of the earth , clear wine , pure wine , pure wine , evil -eyed , eye-catching , water source , fountain. However, it is better to ... Islam means , helper of Islam! (Source: Modern Arabic-Bengali Dictionary - Al-Mu'jamul Wafi , page 96)
Description : Where can I buy queen or king size ortho mattresses?
Last Answer : There are so many brands of mattresses. But you can get great deals and coupon codes, discounts on the DreamCloud: the luxury hybrid mattress combining the best of latex, memory foam, tufting and ... /Soham_09.(Just remove the spaces from the link and get great deals and coupon codes here.)
Description : Which one is the radioactive isotope of hydrogen? (A) Deuterium (B) Ortho-hydrogen (C) Tritium (D) None of these
Last Answer : (C) Tritium
Description : Which of the following silicate minerals are formed by parallel sheets of silicate tetrahedra with Si2O5 or a 2:5 ratio? [a] Ortho silicate [b] Neo Silicate [c] Phyllosilicate [d] Sheet silicate [e] Both 3 & 4
Last Answer : [e] Both 3 & 4
Description : In the manufacture of H3 PO4 (ortho); strong H2 SO4 leaching wet process as compared to electric furnace process (A) Uses lower grade phosphate rock (B) Requires lower capital investment in the plant (C) Produces lower purity acid (D) Is very costly
Last Answer : (C) Produces lower purity acid
Description : Reaction of ortho-phosphoric acid with soda ash produces (A) Sodium Tributyl phosphate (STPP) (B) Tricresyl phosphate (C) Tributyl phosphate (D) Nitrophosphate
Last Answer : (A) Sodium Tributyl phosphate (STPP)