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 : Which of the following is not a correct statement concerning the FriedelCrafts acylation of benzene? (a) An alkyl group substitutes for a hydrogen. (b) The benzene ring attacks an acylium ion. (c) The acylium ion is resonance stabilized. (d) The acylium ion is often produced from an acyl chloride.
Last Answer : An alkyl group substitutes for a hydrogen
Description : Electrophile `NO_(2)^(+)` attacks on the following: In which cases will `NO_(2)^(+)` be at meta-position?
Last Answer : Electrophile `NO_(2)^(+)` attacks on the following: In which cases will `NO_(2)^(+)` be at meta-position? ... I, II and III C. II and III D. I only
Description : Which of the following is not a correct statement about the electrophilic substitution mechanism of benzene? (a) Benzene functions as a nucleophile. (b) Formation of a carbocation intermediate is the ... hybridized carbon in the ring. (d) The addition product is a frequently observed minor product.
Last Answer : The addition product is a frequently observed minor product.
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 phenol with `CHCl_(3)` and aqueous `NaOH` at `70^(@)`, the electrophile attacking the ring is:
Last Answer : In the reaction of phenol with `CHCl_(3)` and aqueous `NaOH` at `70^(@)`, the electrophile attacking the ring is: ... ` C. `:"CCl"_(2)` D. `COCl_(2)`
Description : Phenol is more reactive than benzene towards electrophilic substitution reaction. In case of Phenol, the intermediate carbocation is more resonance st
Last Answer : Phenol is more reactive than benzene towards electrophilic substitution reaction. In case of Phenol, the ... D. A is incorrect but R is correct
Description : An organic compound (A) has a molecular weight 78 and an empirical formula CH. (A) is resistant to attack by oxidizing agents but undergoes substitution and addition reactions. X-ray analysis shows that the ... suggests that compound (A) is (a) Benzene (b) Cyclohexane (c) Toluene (d) n-Hexane
Last Answer : Benzene
Description : A use computer to automatically generate process plans is? a.Lower-level strategies b.Intermediate strategies c.Higher-level strategies d.Morden-level strategies
Last Answer : c.Higher-level strategies
Description : . Operations Research involves _________ attacks of complex problems to arrive at the optimum solution a. Scientific b. Systematic c. Both a & b d. Statistical
Last Answer : c. Both a & b
Description : In Intermediate COCOMO the mode that represents complex products is referred to as a) Embedded b) Semidetached c) Organic d) Multiplicative e) onolithic.
Last Answer : a) Embedded
Description : The molecule of vitamin A1 contains (A) Benzene ring (B) β-Ionone ring (C) β-Carotene ring (D) None of these
Last Answer : Answer : B
Description : How an — OH group attached to carbon in the benzene ring activates benzene towards electrophilic substitution ?
Last Answer : The lone pair of electrons present on oxygen atom enter into resonance with the benzene ring. As a result, the electron density becomes higher at o- and p- position and due to higher electron density, the ring gets activated towards electrophilic substitution.
Description : Benzene ring was proposed by
Last Answer : Kekule.
Description : How many isomers containing a benzene ring correspond to the formula C6H4(COOH)2? (a) 1 (b) 2 (c) 3 (d) 4
Last Answer : 3
Description : The carbon atoms in a benzene ring are : (a) sp hybridized (b) sp3 hybridized (c) sp2 hybridized (d) None of these
Last Answer : sp2 hybridized
Description : Which statement about the structure of benzene is not true? (a) The two Kekule structures of benzene are in equilibrium. (b) The carbon-carbon bond lengths in benzene are greater than the carbon- ... (d) The stability of benzene ring is much greater than the stability of 1,3,5- cycloheptatriene
Last Answer : The two Kekule structures of benzene are in equilibrium
Description : Pick out the wrong statement. (A) Catalytic hydrogenation of carbon monoxide produces methyl alcohol (B) In nylon-6, the number 6 represents the total number of carbon atoms in the ring (C ... are benzene and chlorine (D) Ethanolamines are produced by using ammonia and ethylene oxide as raw material
Last Answer : (C) Raw materials for DDT manufacture are benzene and chlorine
Description : How many carbon atoms are found in the benzene ring?
Last Answer : ANSWER: 6
Description : A major problem with complex pricing structures is that they A)fail to generate the level of revenues needed by an organisation. B)confuse customers and lead to customer dissatisfaction. C) ... to regulation by governmental agencies. D)are almost always viewed as being deceptive by customers.
Last Answer : B)confuse customers and lead to customer dissatisfaction.
Description : Fibrinolytic therapy is based on activation of plasminogen, the inactive proteolytic enzyme of plasma that binds to fibrin during the formation of thrombosis. Activation of plasminogen to plasmin results ... TPA all exceed 30 minutes d. Streptokinase is significantly cheaper than urokinase or TPA
Last Answer : Answer: a, b, d Streptokinase is a bacterial protein produced by group C b-hemolytic streptococci. It is therefore antigenic in humans and can be associated with allergic reaction in ... one agent over the other. Streptokinase however, is markedly less expensive than either urokinase or TPA
Description : For a heterogeneous catalytic reaction (A) Free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction (B) A relatively small amount of catalyst ... with the reactant (D) The surface of the catalyst does not play an important role during reaction
Last Answer : (A) Free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction
Description : The electrophile involved in the above reaction is:
Last Answer : The electrophile involved in the above reaction is: A. Dichloromethyl cation `(overset(o+)(C)HCl_(2))` B. ... ` D. Formyl cation `(overset(o+)(C)HO)`
Description : Which among the following compounds behave both as an electrophile as well a nucleophile? `{:(underset("(1)")(CH_(2)=CH_(2))" "underset("(2)")(CH_(2)=
Last Answer : Which among the following compounds behave both as an electrophile as well a nucleophile? `{:(underset("(1)")(CH_(2)= ... and (4) D. (2), (3) and (4)
Description : Which of the following are electrophile?
Last Answer : Which of the following are electrophile? A. `CN^(-)` B. `BF_(3)` C. `NO_(2)^(+)` D. `AlCl_(3)`
Description : Least active electrophile is :
Last Answer : Least active electrophile is : A. `CH_(3)-overset(O)overset(||)C-OCH_(3)` B. `CH_(3)-overset(O)overset( ... D. `CH_(3)-overset(O)overset(||)C-SCH_(3)`
Description : Which one of the following characteristics belongs to an electrophile?
Last Answer : Which one of the following characteristics belongs to an electrophile? A. It is any species having electron ... in nature D. It is anionic in nature
Description : In a Friedel-Crafts reaction, the electrophile is:
Last Answer : In a Friedel-Crafts reaction, the electrophile is: A. `Cl^(-) or X^(-)` B. `CH_(3)^(+)or CH_(3)CO^(+)` C. `CH_(3)Cl` D. `CH_(3)COCl`
Description : Which one of the following behaves both as a nucleophile and an electrophile ?
Last Answer : Which one of the following behaves both as a nucleophile and an electrophile ? A. `CH_(3)NH_(2)` B. `CH_(3)OH` C. `CH_(3)CN` D. `CH_(3)Cl`
Description : `C_(6)H_(5)OH+CHCl_(3)+NaOH rarr` salicyladehyde The electrophile involved in the above reaction is.
Last Answer : `C_(6)H_(5)OH+CHCl_(3)+NaOH rarr` salicyladehyde The electrophile involved in the above reaction is. A. ... ` D. formly cation `(overset(o+)(C)HO)`
Description : Which of the following is not correct concerning substitution and elimination reactions of alkyl halides? (a) The electrophile replaces the leaving group. (b) Compounds containing electron-donating groups bonded to an ... replaced by another atom or group in substitution reactions. (d) (a) and (b)
Last Answer : (a) and (b)
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 following statements is incorrect? (a) Electrons move toward positively charged locations. (b) An electron-rich atom is called an electrophile. (c) An electrophile is electron loving. (d) A nucleophile has a a pair of electrons it can share
Last Answer : An electron-rich atom is called an electrophile.
Description : A nucleophile acts as a __________ when it reacts with an electrophile. (a) Bronsted-Lowry acid (b) Arrhenius base (c) Lewis acid (d) Lewis base
Last Answer : Lewis base
Description : An electrophile acts as a __________ when it reacts with a nucleophile. (a) Bronsted-Lowry base (b) Arrhenius base (c) Lewis acid (d) Lewis base
Last Answer : Lewis acid
Description : Which of the following is not an electrophile? (a) NH3 (b) Br+ (c) AlCl3 (d) NO2+
Last Answer : NH3
Description : Which of the following solutions will follow Raoult's law most closely? (A) A solution of benzene, toluene and o-xylene (B) 35% solution of camphor in water (C) 35% solution of NH3 in water (D) A solution of polar organic compounds (not of homologue of a series)
Last Answer : (A) A solution of benzene, toluene and o-xylene
Description : Cresols on distillation with zinc dust gives (a) o-Xylene (b) Benzene (c) o- plus p-Xylene (d) Toluene
Last Answer : Toluene
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 : When acetylene is passed through hot iron tube at 400°C, it gives (a) Benzene (b) Toluene (c) o-Xylene (d) Mesitylene
Description : `{:(" "O^(16)),(" ||"),(CH_(3)-C-H overset(D_(2)O^(18))underset(D^(o+))to CH_(3)-C-H),(" ||"),(" "._(18)O):}` Give the following reaction intermediate
Last Answer : `{:(" "O^(16)),(" ||"),(CH_(3)-C-H overset(D_(2)O^(18))underset(D^(o+))to CH_(3)-C-H),(" ||"),(" "._( ... ,(" |"),(CH_(3)-C-H),(" |"),(" "._(18)OD):}`
Description : Assertion: The O - O bond lengths in ozone molecule are intermediate between single and double bonds. Reason: `O_(3)` molecule is a resonance hybrid.
Last Answer : Assertion: The O - O bond lengths in ozone molecule are intermediate between single and double bonds. ... I is not correct and Statement-II is correct
Description : The brown ring test for `NO_(2)^(-)` and `NO_(3)^(-)` is due to the formation of complex ion with formula `:`
Last Answer : The brown ring test for `NO_(2)^(-)` and `NO_(3)^(-)` is due to the formation of complex ion with formula `:` A. ... )` D. `[Fe(H_(2)O)(NO)_(5)]^(2+)`
Description : Vitamin B12 has a complex ring structure (corrin ring) consisting of four (A) Purine rings (B) Pyrimidine rings (C) Pyrrole rings (D) Pteridine rings
Last Answer : Answer : C
Description : Which of the following is a quality management system that gives titles to specialists and requires a cost-benefit analysis? Select one: a. Lean accounting b. Business process re-engineering c. Kaizen d. Six Sigma e. Total Quality Management
Last Answer : d. Six Sigma
Description : The TQM initiative reduces material costs and labor costs. a. Concurrent Engineering (CCE)/Six Sigma b. Benchmarking c. Continuous Product Improvement systems (CPI) d. Channel Support systems e. Quality Initiative Training (QIT)
Last Answer : a. Concurrent Engineering (CCE)/Six Sigma
Description : These TQM initiatives reduce administrative overhead; reduces the R&D cycle time and enhances the effectiveness of the promotion and sales budget. a. Concurrent Engineering (CCE); Channel Support systems ... Inventory d. Channel Support systems and Six Sigma e. Quality Initiative Training (QIT)
Last Answer : b. Quality Function Deployment and Benchmarking