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 compounds will undergo an SN2 reaction most readily? (a) (CH3)3CCH2I (b) (CH3)3CCl (c) (CH3)2CHI (d) (CH3)2CHCH2CH2CH2I
Last Answer : (CH3)2CHCH2CH2CH2I
Description : Which of the following is a secondary alkyl halide? (a) CH3Br (b) (CH3)3CBr (c) (CH3)2CHBr (d) (CH3)2CHCH2Br
Last Answer : (CH3)2CHBr
Description : Ethyl bromide reacts with sodium methoxide to form (a) Diethyl ether (b) Ethyl methyl ether (c) Dimethyl ether (d) n-Propyl alcohol
Last Answer : Ethyl methyl ether
Description : Which of the following halides will be most reactive towards `S_(N^(2))` reaction?
Last Answer : Which of the following halides will be most reactive towards `S_(N^(2))` reaction? A. `C_(6)H_(5)CH_(2 ... (2)-underset(Br)underset("| ")"CH"-CH_(3)`
Description : Aryl halides are less reactive towards nucleophilic substitution as compared to alkyl halides due to (a) Inductive effect (b) Resonance stabilization (c) Tautomerism (d) Stereoisomerism
Last Answer : Resonance stabilization
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 : Acetyl chloride undergoes nucleophilic substitution at a faster rate than methyl acetate because __________. (a) the ester is more sterically hindered than the acid chloride (b) the acid chloride is ... is a better leaving group than chloride (d) chloride is a better leaving group than methoxide
Last Answer : chloride is a better leaving group than methoxide
Description : CH3(CH2)4 is the sodium salt of hexanoic acid. The water solubility of this salt is : (a) higher than that of hexanoic acid (b) lower than that of hexanoic acid (c) completely insoluble (d) not predictable
Last Answer : higher than that of hexanoic acid
Description : Grignard reagents do not show any reaction with (a) Alkoxyalkanes (b) Alkanones (c) Alkyl alkanoates (d) Acyl halides
Last Answer : Alkoxyalkanes
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
Last Answer : All of these
Description : Which of the following compounds will dissolve in aqueous NaOH after undergoing reaction with Hinsberg reagent? (a) CH3CH2NH2 (b) (CH3CH2)2NH (c) (CH3CH2)3N (d) (CH3)3N
Last Answer : CH3CH2NH2
Description : Which of the following compounds would react most rapidly in an SN2 reaction? (a) CH3CH2I (b) CH2=CH–I (c) (CH3)2CHI (d) (CH3)3CI
Last Answer : CH3CH2I
Description : Which of the following is very reactive and kept in kerosene? (1) Sodium (2) Potassium (3) Iodine (4) Bromine
Last Answer : (1) Sodium Explanation: Sodium is a very reactive metal. It reacts vigorously with oxygen and water. A lot of heat is generated in this process. Therefore, it is stored in kerosene to avoid contacts between either atmospheric oxygen or water.
Description : why sodium is less reactive than potassium?
Last Answer : Ans. The ionization enthalpy of potassium is less than that of sodium and the electrode potential of Potassium (-2.95 V) is more negative than that of sodium (-2.71 V) and hence sodium is less reactive than potassium.
Last Answer : Sodium
Description : Number of halides undergoing complete reaction in presence of water under normal conditions is : (i) `BF_(3)` (ii) `BCl_(3)` (iii) `NCl_(3)` (iv) `AlC
Last Answer : Number of halides undergoing complete reaction in presence of water under normal conditions is : (i) `BF_(3)` (ii ... (vi) `PCl_(3)` (vii) `AsCl_(3)`
Description : The correct increasing order of the reactivity of halides for `S_(N^(1))` reaction is:
Last Answer : The correct increasing order of the reactivity of halides for `S_(N^(1))` reaction is: A. `CH_(3)CH_(2)-Xlt( ... -Xlt(CH_(3))_(2)CH-XltCH_(3)CH_(2)-X`
Description : The order of reactivities of the following alkyl halides for a `S_(N^(2))` reaction is :
Last Answer : The order of reactivities of the following alkyl halides for a `S_(N^(2))` reaction is : A. RF > RCl > RBr > ... RBr > RF > RI D. RI > RBr > RCl > RF
Description : Organic Chemistry: E2 reaction mechanism?
Last Answer : potassium tert-butoxide is a strong and exceptionally hindered base and therefore is only capable of abstracting primary (terminal) hydrogens in non-cyclic alkyl halides. The E2 mechanism is concerted, so there are no rearrangements.
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 : The organic reaction represented by equation CH3 - CH = O + H2NOH gives CH3 - CH - NH + H20O is an example of?
Last Answer : a condensation reaction
Description : Silver halides are used in photographic plates because they are - (1) oxidised in air (2) soluble in hyposolution (3) reduced by light (4) totally colourless
Last Answer : (3) reduced by light Explanation: The light-sensitive chemicals used in photographic film and paper are silver halides. Silver halides are used in photographic film and photographic paper, including ... - meaning that it can undergo development which turns the entire crystal into metallic silver.
Description : Why the presence of a base is essential in the ammonolysis of alkyl halides ?
Last Answer : During ammonolysis of alkyl halides, the acid liberated during the reaction combines with the amine formed to form amine salt. To liberate free amine from the amine salt, a base is needed.
Description : Metal sulphides occur mainly in rocks and metal halides in lakes and seas. Explain.
Last Answer : Ans.: Metal halides being soluble in water, get dissolved in rain water and are carried to lakes and seas during weathering of rocks. On the otherhand, metal sulphides being insoluble are left behind in the rocks as residue.
Description : Give reason for the appearance of colour in alkali metal halides.
Last Answer : Due to F-centres.
Description : When ammonia is added to an alkyl halide, in the presence of base : (a) primary amines form (b) amides form (c) nitrated alkyl halides form (d) quaternary ammonium salts form
Last Answer : primary amines form
Description : Alkyl halides react with ammonia in the presence of base to form : (a) primary amines (b) nitrated alkyl halides (c) amides (d) quaternary ammonium salts
Last Answer : primary amines
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 : Which alkyl halides react most readily by nucleophilic substitution? (a) CH3CH2Cl (b) CH3CH2I (c) CH3CH2Br (d) CH3CH2F
Description : Alkyl halides undergo (a) Electrophilic substitution reactions (b) Electrophilic addition reactions (c) Nucleophilic substitution reactions (d) Nucleophilic addition reactions
Last Answer : Nucleophilic substitution reactions
Description : Whose name is given to alkylmagnesium halides: w) Victor Grignard x) Daniel Rutherford y) Dmitri Mendeleev
Last Answer : ANSWER: W -- VICTOR GRIGNARD
Description : Silver halides are used in photographic plates because they are (1) oxidised in air (2) soluble in hyposolution (3) reduced by light (4) totally colourless
Last Answer : reduced by light
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 : 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 : 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 : 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 : Is KOC(CH3)3 equivalent to KOH as a base in chemical equations?
Last Answer : This depends completely on the equation in question. For instance, both are strong bases, so if that's all you're worried about, yeah, they're about equivalent. But potassium tert-butoxide is way bulkier ... not in others. Those are the big differences that jump out to me, but there may be others.
Description : Write the IUPAC name for: (CH3)2CHCH(OH)CH2C(CH3)3,identify the functional group and type of compound.
Last Answer : Ans. 2,5,5-trimethylhexan-3-ol, alcohol, secondary alcohol
Description : Which of the following terms best describes the compound below? CH3(CH2)26CO2CH2(CH2)32CH3 (a) a fat (b) a wax (c) a terpene (d) an unsaturated triglyceride
Last Answer : a wax
Description : Which of the following terms best describes the compound below? CH3(CH2)7CH=CH(CH2)7CO2H (a) an unsaturated fatty acid (b) a triglyceride (c) a synthetic detergent (d) a micelle
Last Answer : an unsaturated fatty acid
Description : Which of the following terms best describes the compound below? CH3(CH2)12CO2H (a) a fatty acid (b) an oil (c) a wax (d) a soap
Last Answer : a fatty acid
Description : Acetamide is a much weaker base than ammonia. This is because (a) the electron withdrawing effect of the C=O group makes the lone pair of electrons on nitrogen atom less available for protonation. (b) ) ... NH2 group. (d) an H atom from the nitrogen is less easily lost from CH3CONH2 than from NH3.
Last Answer : the electron withdrawing effect of the C=O group makes the lone pair of electrons on nitrogen atom less available for protonation
Description : Which of the following is closest to the C–O–C bond angle in CH3–O–CH3? (a) 180° (b) 120° (c) 109.5° (d) 90°
Last Answer : 109.5°
Description : Which of the following is sec-butyl alcohol? (a) CH3CH2CH2CH2OH (b) CH3CH(OH)CH2CH3 (c) (CH3)2CHCH2OH (d) (CH3)2CHOH
Last Answer : CH3CH(OH)CH2CH3
Description : What is the IUPAC name for the following structure? CH3CH(CH3)CH2CH(OH)CH3 (a) 4-methyl-2-pentanol (b) 2-methyl-2-hexanol (c) 2-methyl-4-pentanol (d) 2-methyl-3-pentanol
Last Answer : 4-methyl-2-pentanol
Description : Which of the following is most resistant to oxidation? (a) CH3CH2OH (b) (CH3)2CHOH (c) HOCH2CH2OH (d) (CH3)3COH
Last Answer : (CH3)3COH