Description : The nitrogan atom in each of the following tertiary amines may be removed as trimethyl amine by repeated Hoffmann elimination. Which of the following
Last Answer : The nitrogan atom in each of the following tertiary amines may be removed as trimethyl amine by repeated Hoffmann ... to accomplish this? A. B. C. D.
Description : Prominent foul smell of Karnal bunt is due to (A) Trienthyl amine (B) Trimethyl amine (C) Dimethyl amine (D) None
Last Answer : (B) Trimethyl amine
Description : In the hofmann-bromamide degradation reaction, the number of moles of NaOH and `Br_(2)` used per mole of amine produced are
Last Answer : In the hofmann-bromamide degradation reaction, the number of moles of NaOH and `Br_(2)` used per mole of ... moles of NaOH and one mole of `Br_(2)`
Description : Hofmann rearrangement In the Hofmann rearrangement an unsubstituted amide is treated with sodium hydroxide and bromide to give a primary amine that ha
Last Answer : Hofmann rearrangement In the Hofmann rearrangement an unsubstituted amide is treated with sodium hydroxide and bromide to ... . `II gt I gt IV gt III`
Last Answer : Hofmann rearrangement In the Hofmann rearrangement an unsubstituted amide is treated with sodium hydroxide and bromide to ... O)overset(||)(C)-NH_(2)`
Description : The conversion of an amide by reaction `NaOH` and `Br_(2)` to primary amine that has one carbon than the strating amide is known as Hofmann-Bromoamide
Last Answer : The conversion of an amide by reaction `NaOH` and `Br_(2)` to primary amine that has one carbon than the ... ` Mechanism: A. B. C. D. all of these
Last Answer : The conversion of an amide by reaction `NaOH` and `Br_(2)` to primary amine that has one carbon than the strating ... : Find X and Y: A. B. C. D.
Last Answer : The conversion of an amide by reaction `NaOH` and `Br_(2)` to primary amine that has one carbon than the strating ... reaction: A. 1 B. 2 C. 3 D. 4
Description : Which of the following drugs undergoes ‘Hofmann’ elimination: A. Succinylcholine B. Pancuronium C. Vecuronium
Last Answer : D. Atracurium
Description : Quartenry ammonium salt after Hofmann elimination gives--- a. Alcohol b. Alkene c. Alkyne d. Ammmonia
Last Answer : b. Alkene
Description : Of the following amines how many can give carbyl amine reaction?
Last Answer : Of the following amines how many can give carbyl amine reaction?
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 : Of the following reactions, how many reaction, are used for the preparation of amines? (a) `R-C-=N overset(LiAIh_(4))rarr` (b) `R-overset(O)overset(||
Last Answer : Of the following reactions, how many reaction, are used for the preparation of amines? (a) `R-C-=N overset( ... R-CH_(2)-NO_(2) overset(H_(2),Ni)rarr`
Description : Can tertiary amines undergo acetylation reactions ? Explain.
Last Answer : For an amine to undergo acetylation, it should have a replaceable hydrogen atom. Tertiary amines cannot undergo acetylation reactions because these do not have replaceable hydrogen atom.
Description : Which of the following statements is false about primary amines? (a) They can be prepared by reduction of nitriles with LiAlH4. (b) They do not form salts with acids (c) They react with ice-cold nitrous acid to form nitrogen gas. (d) They are basic and soluble in water
Last Answer : They do not form salts with acids
Description : In the following reactions `2X+B_(2)H_(6) to [BH_(2)(X)_(2)]^(+){BH_(4)]^(-)` The amine X will not be -
Last Answer : In the following reactions `2X+B_(2)H_(6) to [BH_(2)(X)_(2)]^(+){BH_(4)]^(-)` The amine X will not be - A. ... C. `(CH_(3))_(2)NH` D. `(CH_(3))_(3)N`
Description : Which of the following reduction reactions does not give an amine as product?
Last Answer : Which of the following reduction reactions does not give an amine as product? A. `R-NO_(2) underset(" ... (2)underset(Delta)overset(Zn//NH_(4)Cl)rarr`
Description : In which of the following reactions does the amine behaves as an acid ?
Last Answer : In which of the following reactions does the amine behaves as an acid ? A. `(C_(2)H_(5))_(2)NH +H_(2) PtCI_ ... (C_(2)H_(5))_(3)overset(..)(N)+BF_(3)`
Description : Answer: b, c, d Eosinophils constitute 1% to 3% of the leukocyte population of the bloodstream. They also reside in tissues and they exhibit phagocytic capabilities. They are less ... the cycle of events that result in recruitment and activation of inflammatory cells at sites of inflammation
Last Answer : Cellular injury from oxidants may be manifest by which of the following? a. Cell membrane lipid peroxidation b. DNA strand breaks c. Cytoskeletal disassembly d. ATP depletion
Description : An essential element of all allergy reactions is the a. Release of interferons from tissue cells. b. Accumulation of ige on the surfaces of mast cells and basophils. c. Passage of igg from the immune system to local tissue cells. d. Elimination of all traces of plasma cells from the body.
Last Answer : b. Accumulation of ige on the surfaces of mast cells and basophils.
Description : Erythromycin contains (A) Dimethyl amino sugar (B) Trimethyl amino sugar (C) Sterol and sugar (D) Glycerol and sugar
Last Answer : A
Description : Out of glucose, urea and dodecyl trimethyl ammonium chloride, which one forms micelles in aqueous solution above certain concentration ?
Last Answer : Ans. Dodecyl trimethyl ammonium chloride.
Description : Octane number of 2, 2, 4 - trimethyl pentane is (A) 0 (B) 100 (C) In between 0 and 100 (D) More than 100
Last Answer : (B) 100
Last Answer : (A) Dimethyl amino sugar
Description : Which of the following is used to increase the anti-knocking property of petrol ? (1) Tetramethyl lead (2) Tetraethyl lead (3) Trimethyl lead (4) Triethyl lead
Last Answer : Tetraethyl lead
Description : Which of the following statements is false about aniline? (a) It is a primary aromatic amine. (b) It is a weak base which forms salts with acids. (c) It liberates nitrogen on treatment with ice-cold nitrous acid. (d) It can be prepared by the reduction of nitrobenzene with tin and HCl
Last Answer : It liberates nitrogen on treatment with ice-cold nitrous acid
Description : The hybridization of nitrogen in an amine is (a) sp (b) sp3 (c) sp2 (d) sp4
Last Answer : sp3
Description : under Hofmann conditions will give :
Last Answer : under Hofmann conditions will give : A. B. C. D.
Description : Which of the following will give Hofmann-Bromoamide reaction?
Last Answer : Which of the following will give Hofmann-Bromoamide reaction? A. B. C. D.
Description : In the Hofmann-Bromamide rearrangement intermediate compounds are:
Last Answer : In the Hofmann-Bromamide rearrangement intermediate compounds are: A. `R -CONHBr` B. `[R-overset(O)overset(||)(C)- ... ` C. `R -N=C=O` D. all of these
Description : Which of the following is Hofmann mustard oil reaction?
Last Answer : Which of the following is Hofmann mustard oil reaction? A. Reaction of primary amine with `CHCI_(3 ... 2)` D. Reaction of armoatic amine with iodoform
Description : Is Hans hofmann a modern artist?
Last Answer : Need answer
Description : ----rearrangement involves alpha diketone. a. Wolf b. Schmidt c. Hofmann d. Curtius
Last Answer : a. Wolf
Description : How many amines are possible with the molecular formula `C_(4)H_(11)N` (structural isomers only) :-
Last Answer : How many amines are possible with the molecular formula `C_(4)H_(11)N` (structural isomers only) :- A. 6 B. 7 C. 8 D. 9
Description : Chemically hormones are (a) biogenic amines only (b) proteins, steroids and biogenic amines (c) proteins only (d) steroids only.
Last Answer : (b) proteins, steroids and biogenic amines
Description : n-propylamine containing no secondary and tertiary amines as impurities is prepared by
Last Answer : n-propylamine containing no secondary and tertiary amines as impurities is prepared by A. Hoffmann ... n-propylchloride with ammonia D. none of these
Description : Best method for preparing primary amines from alkyl halides without changing the number of carbon atoms in the chain is
Last Answer : Best method for preparing primary amines from alkyl halides without changing the number of carbon atoms in ... reaction D. Reaction with `NH_(3)`
Description : The strongest base in aqueous solution among the following amines is :
Last Answer : The strongest base in aqueous solution among the following amines is : A. N,N- ... N-ethylethanamine C. M-methylmethanamine D. ethanamine
Description : Which of the following amines cannot be prepared by path-I?
Last Answer : Which of the following amines cannot be prepared by path-I? A. B. C. D.
Description : Which of the following amines reacts most rapidly with
Last Answer : Which of the following amines reacts most rapidly with A. B. C. D.
Description : Which of the following amines form `N-` nitroso derivative when treated with `NaNO_(2)` and `HCI`?
Last Answer : Which of the following amines form `N-` nitroso derivative when treated with `NaNO_(2)` and `HCI`? A. `CH_(3)NH_(2)` B. C. D.
Description : Which of the following amines will react with cyclohexanone to give enamine?
Last Answer : Which of the following amines will react with cyclohexanone to give enamine? A. `CH_(3)NH_(2)` B. C. D.
Description : The correct sequence regarding base strength of aliphatic amines in aqueous solution is:
Last Answer : The correct sequence regarding base strength of aliphatic amines in aqueous solution is: A. `R_(3)N gt R_(2) NH gt ... gt R_(2)NH gt R_(3)N gt NH_(3)`
Description : Chemically fats and oils are: (1) Triesters (2) Amines (3) Aldehydes (4) Ketons
Last Answer : (1) Triesters Explanation: Fats and oils are called triglycerides (or triacylcylgerols) because they are esters composed of three fatty acid units joined to glycerol, a trihydroxy alcohol. Fats and oils are composed of molecules known as triglycerides, which are esters.
Description : Aromatic primary amines are not prepared by gabrial phthalimide synthesis. Why?
Last Answer : Ans:- Because aryl halides donot undergo nucleophilic substitution reaction.
Description : Why tert. Amines donot undergo acylation reaction ?
Last Answer : Ans.-- Tert. Amines donot undergo acylation reaction because they donot have Nattached to H- atom.
Description : Why are amines always less acidic than comparable alcohols?
Last Answer : Ans.--- Amines are less acidic than alcohols because of oxygen higher electronegative & smaller size. Therefore O-H breakes easily than N-H bond.
Description : Give reasons:--- a. Primary amines are more basic than ammonia. b . Sec. amines are more basic than pr.amines.
Last Answer : Ans— a. In pr. Amines, alkyl group increases electron density on the N-atom making it more basic than ammo b. In sec. amine, there are two alkyl groups increase electron density on N-atom more than N-atom in pr. amines in which there is one alkyl group.
Description : Write the molecular formula of some members of amines.
Last Answer : Name of amine Molecular Formula 1. Methyl amine 2. Ethyl amine CH 3 NH 2 C 2 H 5 NH 2
Description : What are amines? Write their general formula.
Last Answer : Compounds containing –NH 2 as the functional group are called amines. Their general formula is R –NH 2