Description : Which of the following is not a nucleophile? (a) NH3 (b) HSO3– (c) AlCl3 (d) HO–
Last Answer : AlCl3
Description : Which of the following reagents can be used to reduce acetaldehyde to ethyl alcohol? (a) 1. LiAlH4 / 2. H3O+ (b) 1. NaBH4 / 2. H3O+ (c) H2/Pt (d) All of these
Last Answer : All of these
Description : The conjugate acid of water is: w) OHx) H2 y) O2 z) H3O+
Last Answer : ANSWER: Z -- H3O+
Description : Out of NH3 & BF3 Which is polar & Why?
Last Answer : Ans. NH3 has net dipole moment because resultant of 3N-H bond & lone pair lie in the same direction. While BF3 being trigonal planar has zero dipole moment.
Description : Which of the following are Lewis bases? (a) NF3 (b) BF3 (c) CH3OCH3 (d) (a) and (c
Last Answer : (a) and (c
Description : Point group D3h belong to the molecule a. BF3 b. NH3 c. CHCl3 d. CH3
Last Answer : a. BF3
Description : Which of the following species contains three bond pairs and one lone pair around the central atom? (1) PCl3 (2) H2O (3) BF3 (4) NH2
Last Answer : PCl3
Description : 13. Which one of the following pairs is isostructural (i.e. having the same shape and hybridization)? (1) 4 4 [BF and NH ] (2) 3 3 [BCl and BaCl ] (3) 3 3 [NH and NO ] (4) [NF3 and BF3 ] Sol: [1] In both the compounds, central atom i
Last Answer : (1) 4 4 [BF and NH ]
Description : How many bonding and non-bonding electron pairs are found in the BF3 molecule? A 1 bonding and 3 non-bonding B 2 bonding and 2 non-bonding C 3 bonding and 1 non-bonding D 3 bonding and 0 non-bonding E 4 bonding and 0 non-bonding
Last Answer : D 3 bonding and 0 non-bonding
Description : Which of the following molecules has a dipole moment? w) BF3 x) NH3 y) CCL4 z) CH4
Last Answer : ANSWER: B -- NH3
Description : For which molecule can the bonding be described in terms of sp3 hybrid orbitals of the central atom? w) CH4 x) SF6 y) BF3 z) PCL5
Last Answer : ANSWER: B -- CH4
Description : Which of the following molecules does NOT have a dipole moment of zero? w) BeCl2 x) BF3 y) CO2 z) NH3
Last Answer : ANSWER: Z -- NH3
Description : What is the compound polarity for H3O?
Last Answer : What is the answer ?
Description : What is the pH of a solution with H3O plus 1 x 10-9 M?
Last Answer : Need answer
Description : The hydronium ion is (a) H+ (b) HO2 (c) H2+ (d) H3O+
Last Answer : Ans:(d)
Description : Adding Cl2 to benzene in the presence of AlCl3 is an example of – (1) Elimination reaction (2) Substitution reaction (3) None of the options (4) Addition reaction
Last Answer : (2) Substitution reaction Explanation: The reaction between benzene and chlorine in the presence of a catalyst such as aluminium chloride gives Chlorobenzene. This reaction is an example of electrophilic substitution ... since one of the hydrogen atoms on the ring is replaced by a chlorine atom.
Description : Out of (a) 1 M CaCl2 (b) 1 M AlCl3 which aqueous soln. will show max. vapour pressure at 300 K ?
Last Answer : (a) 1 M CaCl3 , if we assume 100% dissociation, i for CaCl2 = 3 and AlCl3 = 4 and relative lowering of V. P. is directly proportional to i.
Description : Iodobenzene can be prepared by (a) treating chlorobenzene with I2 using FeCl3 catalyst. (b) treating phenol with I2 in NaOH solution. (c) treating benzenediazonium chloride with KI (d) treating benzene with CH3I using AlCl3 catalyst
Last Answer : treating benzenediazonium chloride with KI
Description : Benzene reacts with acetic anhydride in the presence of AlCl3 to form (a) Acetophenone (b) Benzophenone (c) Phenylacetic acid (d) Phenyl acetate
Last Answer : Acetophenone
Description : Which of the following agents is used in order to make benzene react with acetyl chloride to give acetophenone? (a) Ultraviolet light (b) AlCl3 catalyst (c) Platinum catalyst (d) Al2O3 catalyst
Last Answer : AlCl3 catalyst
Description : Toluene reacts with chlorine in the presence of AlCl3 to give (a) o-Chlorotoluene (b) o- plus p-Chlorotoluene (c) m-Chlorotoluene (d) o- plus m-Chlorotoluene
Last Answer : o- plus p-Chlorotoluene
Description : Which of the following reagents will react with methyl group rather than the benzene ring in methylbenzene? (a) Chlorine in the presence of uv light (b) CH3Cl in the presence of AlCl3 (c) CH3COCl in the presence of AlCl3 (d) Hydrogen in the presence of nickel
Last Answer : Chlorine in the presence of uv light
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 : What is the major organic product of the reaction between benzene and isobutyl chloride in the presence of AlCl3? (a) tert-butylbenzene (b) isobutylbenzene (c) n-butylbenzene (d) chlorobenzene
Last Answer : tert-butylbenzene
Description : Which of the following is a Lewis acid? (a) AlCl3 (b) CH3OH (c) NH3 (d) CH3OCH3
Description : Which of the following is not an electrophile? (a) NH3 (b) Br+ (c) AlCl3 (d) NO2+
Last Answer : NH3
Description : Adding Cl2 to benzene in the presence of AlCl3 is an example of : (1) Elimination reaction (2) Substitution reaction (3) None of the options (4) Addition reaction
Last Answer : Substitution reaction
Description : Why cyanide ion act as ambident nucleophile ?
Last Answer : Ans.---- Cyanide ion can link through either carbon or nitrogen, therefore it is an ambident nuclophile.
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 : Why do aldehydes undergo nucleophilic addition reactions while esters undergo nucleophilic acyl substitution reactions? (a) The carbonyl carbon of an ester is more electrophilic than that of an aldehyde. (b) ... adds to an aldehyde, neither H− nor R− can be eliminated since they are strongly basic
Last Answer : Once the nucleophile adds to an aldehyde, neither H− nor R− can be eliminated since they are strongly basic
Description : Which of the following factors has no effect on the rate of SN1 reactions? (a) the nature of the alkyl halide (b) the nature of the leaving group (c) the concentration of the alkyl halide (d) the concentration of the nucleophile
Last Answer : the concentration of the nucleophile
Description : Which of the following is the rate law for SN1 mechanisms? (a) Rate = k[Alkyl Halide] [Nucleophile] (b) Rate = k[Nucleophile] (c) Rate = k[Alkyl Halide] (d) Rate = k1[Alkyl Halide] + k2[Nucleophile]
Last Answer : Rate = k[Alkyl Halide]
Description : Which of the following is the best nucleophile in water? (a) I– (b) CH3SCH3 (c) CH3OCH3 (d) Cl–
Last Answer : I–
Description : Which of the following is the strongest nucleophile in an aqueous solution? (a) HO– (b) Cl– (c) Br– (d) I
Description : Which of the following statements concerning SN2 reactions of alkyl halides is not correct? (a) The rate of reaction depends on the concentration of the nucleophile. (b) The rate of reaction depends on the ... carbon of the C-Br bond. (d) All alkyl iodides react more rapidly than all alkyl chlorides
Last Answer : All alkyl iodides react more rapidly than all alkyl chlorides
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
Description : Which of the following is not a possible reaction of a carbocation? (a) addition of a nucleophile (b) rearrangement to a more stable carbocation (c) addition of a proton to form an alkane (d) loss of a β-hydrogen to form an alkene
Last Answer : addition of a proton to form an alkane
Description : Which of the following statements correctly describes the general reactivity of alkynes? (a) An alkyne is an electron-rich molecule and therefore reacts as a nucleophile. (b) The σ bonds ... fail to undergo electrophilic addition reactions. (d) Alkynes are generally more reactive than alkenes.
Last Answer : Alkynes are generally more reactive than alkenes.
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 : 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 : Which of the following is not a nucleophile? (a) FeBr3 (b) Br– (c) NH3 (d) CH3OCH3
Last Answer : CH3OCH3
Description : Which of the following is not normally considered to be a nucleophile? (a) NH3 (b) CH3NH2 (c) HC≡C:– (d) CH3CH2+
Last Answer : CH3CH2+
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 : 1. The ionic compound made from aluminum and chlorine has the formula AlCl3. Explain in detail why it is the correct formula?
Last Answer : ionic bonding
Description : What is hybridization of Al in AlCl3?
Last Answer : What is hybridization of Al in AlCl3?
Description : What are the correct coefficients in correct order Al2CO33 plus ZnCl2 ZnCO3 plus AlCl3 what are the coefficiants?
Description : Use complete sentences to explain why AlCl3 is called “aluminum chloride†(no prefix required), but BCl3 is called “boron trichloride.�
Last Answer : Ionic compounds do not have prefixes but covalent compounds have prefixes. “Aluminum chloride†is a ionic compound and "boron tri-chloride†is a covalent compound.
Description : Zeigler - Natta catalyst (AlR3 - AlCl3 ) is used in the polymerisation of (A) Vinyl acetate (B) Vinyl chloride (C) Propylene (D) Styrene
Last Answer : (C) Propylene