Starting with 2-butene, which of the following is the best method for preparing 2-butyne? (a) HBr; H2/Ni; Zn/H+ (b) HBr; Zn/H+; H2/Ni (c) Br2/CCl4; Zn/H+; H2/Ni (d) Br2/CCl4; 2NaNH2

Starting with 2-butene, which of the following is the best method for
preparing
2-butyne?
(a) HBr; H2/Ni; Zn/H+
(b) HBr; Zn/H+; H2/Ni
(c) Br2/CCl4; Zn/H+; H2/Ni
(d) Br2/CCl4; 2NaNH2
by

1 Answer

Answer :

Br2/CCl4; 2NaNH2
by

Related questions

Which of the following reagents can be used to distinguish between chlorobenzene and allyl chloride? (a) H2/Ni(b) Br2 in CCl4(c) Zn/HCl(d) NH2NH2

Description : Which of the following reagents can be used to distinguish between chlorobenzene and allyl chloride? (a) H2/Ni (b) Br2 in CCl4 (c) Zn/HCl (d) NH2NH2

Last Answer : Br2 in CCl4

Which of the following is the best method for preparing CH3Br? (a) CH3OH + Br– (b) CH3OH + HBr (c) CH3OH + Br2 (d) CH3OH + NaBr

Description : Which of the following is the best method for preparing CH3Br? (a) CH3OH + Br– (b) CH3OH + HBr (c) CH3OH + Br2 (d) CH3OH + NaBr

Last Answer : CH3OH + HBr

The reagent needed to convert 2-butyne to cis-2-butene is : (a) H2/Pt (b) H2/Lindlar’s catalyst (c) Li/NH3 (d) Na/NH3

Description : The reagent needed to convert 2-butyne to cis-2-butene is : (a) H2/Pt (b) H2/Lindlar’s catalyst (c) Li/NH3 (d) Na/NH3

Last Answer : H2/Lindlar’s catalyst

Which of the following reagents will react with acetamide to form methylamine? (a) LiAlH4 (b) Br2/NaOH (c) PCl5 (d) H2/Ni

Description : Which of the following reagents will react with acetamide to form methylamine? (a) LiAlH4 (b) Br2/NaOH (c) PCl5 (d) H2/Ni

Last Answer : Br2/NaOH

Cyclohexanol can be converted into cyclohexene by heating with (a) Zn(Hg) and HCl(b) Concentrated H2SO4(c) SOCl2(d) H2 and Ni

Description : Cyclohexanol can be converted into cyclohexene by heating with (a) Zn(Hg) and HCl (b) Concentrated H2SO4 (c) SOCl2 (d) H2 and Ni

Last Answer : Concentrated H2SO4

1-Butyne can be distinguished from 2-butyne by using (a) potassium permanganate (b) bromine in CCl4 (c) Tollens' reagent (d) chlorine in CCl4

Description : 1-Butyne can be distinguished from 2-butyne by using (a) potassium permanganate (b) bromine in CCl4 (c) Tollens' reagent (d) chlorine in CCl4

Last Answer : chlorine in CCl4

Which of the following reagents can be used to distinguish between chlorobenzene and benzyl chloride? (a) alcoholic AgNO3 (b) Br2 in CCl4 (c) KCN (d) Br2 in H2O

Description : Which of the following reagents can be used to distinguish between chlorobenzene and benzyl chloride? (a) alcoholic AgNO3 (b) Br2 in CCl4 (c) KCN (d) Br2 in H2O

Last Answer : alcoholic AgNO3

Baeyer's reagent is (a) dilute KMnO4 (b) HCl + ZnCl2 (c) Br2 in CCl4 (d) NH2NH2

Description : Baeyer's reagent is (a) dilute KMnO4 (b) HCl + ZnCl2 (c) Br2 in CCl4 (d) NH2NH2

Last Answer : dilute KMnO4

1-Butyne reacts with (a) NaNH2 (b) Dil H2SO4 and HgSO4 (c) HBr (d) All of these

Description : 1-Butyne reacts with (a) NaNH2 (b) Dil H2SO4 and HgSO4 (c) HBr (d) All of these

Last Answer : All of these

The major product of acid-catalyzed dehydration of 2-butanol is : (a) 2-Butene (b) 2-Butyne (c) 1-Butene (d) 1-Butyne

Description : The major product of acid-catalyzed dehydration of 2-butanol is : (a) 2-Butene (b) 2-Butyne (c) 1-Butene (d) 1-Butyne

Last Answer : 2-Butene

A compound, C4H6, reacts with bromine and forms a white precipitate with ammoniacal silver nitrate solution. It reacts with dilute H2SO4 in the presence of mercuric sulfate to form 2-butanone. The compound could be (a) 1-Butyne (b) 1-Butene (c) 2-Butyne (d) 2-Butene

Description : A compound, C4H6, reacts with bromine and forms a white precipitate with ammoniacal silver nitrate solution. It reacts with dilute H2SO4 in the presence of mercuric sulfate to form 2-butanone. The compound could be (a) 1-Butyne (b) 1-Butene (c) 2-Butyne (d) 2-Butene

Last Answer : 1-Butyne

Which of the following compounds reacts with ammoniacal cuprous chloride to give a precipitate? (a) 1-Butene (b) 1-Butyne (c) 2-Butene (d) 2-Butyne

Description : Which of the following compounds reacts with ammoniacal cuprous chloride to give a precipitate? (a) 1-Butene (b) 1-Butyne (c) 2-Butene (d) 2-Butyne

Last Answer : 1-Butyne

Which of the following compounds will react with ammoniacal silver nitrate? (a) 1-Butene (b) 1-Butyne (c) 2-Butene(d) 2-Butyne

Description : Which of the following compounds will react with ammoniacal silver nitrate? (a) 1-Butene (b) 1-Butyne (c) 2-Butene (d) 2-Butyne

Last Answer : 1-Butyne

2-Butyne undergoes catalytic hydrogenation in the presence of Lindlar's catalyst to give (a) 2-Butene (b) Butane (c) 1-Butene (d) 2-Methylpropene

Description : 2-Butyne undergoes catalytic hydrogenation in the presence of Lindlar's catalyst to give (a) 2-Butene (b) Butane (c) 1-Butene (d) 2-Methylpropene

Last Answer : 2-Butene

Which of the following hydrocarbons has acidic hydrogens? (a) 1-Butene (b) 1-Butyne (c) 2-Butene (d) 2-Butyne

Description : Which of the following hydrocarbons has acidic hydrogens? (a) 1-Butene (b) 1-Butyne (c) 2-Butene (d) 2-Butyne

Last Answer : 1-Butyne

Which of the following will give a negative test when treated with bromine in carbon tetrachloride? (a) Butane (b) 2-Butene (c) 1,3-Butadiene (d) 2-Butyne

Description : Which of the following will give a negative test when treated with bromine in carbon tetrachloride? (a) Butane (b) 2-Butene (c) 1,3-Butadiene (d) 2-Butyne

Last Answer : Butane

The dehydrohalogenation of 2-bromobutane with alcoholic KOH gives mainly (a) 2-Butene (b) 2-Butyne (c) 1-Butene (d) 1-Butyne

Description : The dehydrohalogenation of 2-bromobutane with alcoholic KOH gives mainly (a) 2-Butene (b) 2-Butyne (c) 1-Butene (d) 1-Butyne

Last Answer : 2-Butene

Which of the following compounds will show geometrical isomerism? (a) Propene (b) 2-Butene (c) Propyne (d) 2-Butyne

Description : Which of the following compounds will show geometrical isomerism? (a) Propene (b) 2-Butene (c) Propyne (d) 2-Butyne

Last Answer : 2-Butene

Bromobenzene can be prepared by treating aniline with (a) Conc HBr (b) Br2/FeBr3 (b) CuBr (d) Nitrous acid then CuBr

Description : Bromobenzene can be prepared by treating aniline with (a) Conc HBr (b) Br2/FeBr3 (b) CuBr (d) Nitrous acid then CuBr

Last Answer : Nitrous acid then CuBr

The best way to prepare 1,2-Dibromoethane is to treat : (a) Ethylene with Br2 (b) Acetylene with excess of HBr (c) Ethylene with excess of HBr (d) 1,2-Dichloroethane with Br2

Description : The best way to prepare 1,2-Dibromoethane is to treat : (a) Ethylene with Br2 (b) Acetylene with excess of HBr (c) Ethylene with excess of HBr (d) 1,2-Dichloroethane with Br2

Last Answer : Ethylene with Br2

The reaction of 1-butene with bromine, Br2, in aqueous solution gives primarily 1-bromo-2-butanol. Identify the nucleophilic species in the reaction. (a) Br2 (b) Br– (c) H2O (d) HOBr

Description : The reaction of 1-butene with bromine, Br2, in aqueous solution gives primarily 1-bromo-2-butanol. Identify the nucleophilic species in the reaction. (a) Br2 (b) Br– (c) H2O (d) HOBr

Last Answer : H2O

What compound results from the 1,4-addition of one equivalent of HBr to 1,3-butadiene? (a) 1-bromo-1-butene (b) 2-bromo-2-butene (c) 4-bromo-1-butene (d) 1-bromo-2-butene

Description : What compound results from the 1,4-addition of one equivalent of HBr to 1,3-butadiene? (a) 1-bromo-1-butene (b) 2-bromo-2-butene (c) 4-bromo-1-butene (d) 1-bromo-2-butene

Last Answer : 1-bromo-2-butene

2-Methyl-2-butene reacts with HBr in the presence of peroxide to give (a) A primary alkyl bromide (b) A secondary alkyl bromide (c) A tertiary alkyl bromide (d) A vicinal dibromide

Description : 2-Methyl-2-butene reacts with HBr in the presence of peroxide to give (a) A primary alkyl bromide (b) A secondary alkyl bromide (c) A tertiary alkyl bromide (d) A vicinal dibromide

Last Answer : A secondary alkyl bromide

Which of the following alkenes reacts with HBr in the presence of a peroxide to give anti-Markovnikov's product? (a) 1-Butene (b) 2,3-Dimethyl-2-butene (c) 2-Butene (d) 3-Hexene

Description : Which of the following alkenes reacts with HBr in the presence of a peroxide to give anti-Markovnikov's product? (a) 1-Butene (b) 2,3-Dimethyl-2-butene (c) 2-Butene (d) 3-Hexene

Last Answer : 1-Butene

2-Butene reacts with HBr to give (a) 1-Bromobutane (b) 2,3-Dibromobutane (c) 2-Bromobutane (d) 2,2-Dibromobutane

Description : 2-Butene reacts with HBr to give (a) 1-Bromobutane (b) 2,3-Dibromobutane (c) 2-Bromobutane (d) 2,2-Dibromobutane

Last Answer : 2-Bromobutane

Markovnikov's addition of HBr is not applicable to (a) Propene (b) 1-butene (c) 1-pentene (d) 2-butene

Description : Markovnikov's addition of HBr is not applicable to (a) Propene (b) 1-butene (c) 1-pentene (d) 2-butene

Last Answer : 2-butene

(a) What are fuel cells? Explain the electrode reactions involved in the working of H2 – O2 fuel cell. (b) Represent the galvanic cell in which the reaction Zn (s) + Cu2+ (aq) → Zn2+ (aq) + Cu (s) takes place. -Chemistry

Description : (a) What are fuel cells? Explain the electrode reactions involved in the working of H2 – O2 fuel cell. (b) Represent the galvanic cell in which the reaction Zn (s) + Cu2+ (aq) → Zn2+ (aq) + Cu (s) takes place. -Chemistry

Last Answer : (a) Fuel cells : These cells are the devices which convert the energy produced during combustion of fuels like H2, CH4, etc. directly into electrical energy. The electrode reaction for H2 – O2 fuel cell : (b) The galvanic cell may be represented as Zn (s) | Zn2+ (1M) || Cu2+ (1M) | Cu (s)

Which of the following produces H2 gas, when reacts with acid? (1) Zn (2) S (3) C (4) O

Description : Which of the following produces H2 gas, when reacts with acid? (1) Zn (2) S (3) C (4) O

Last Answer : (1) Zn Explanation: As, Zinc is a metal so it will produce H2 gas when reacts with acid. Active metals react with acids to produce hydrogen because they are above hydrogen in the activity series.

Zn + 2 HCl = H2 + ZnCl, is an example of which type of reaction? (1) Double displacement reaction (2) Combination reaction (3) Single displacement reaction (4) Decomposition reaction

Description : Zn + 2 HCl = H2 + ZnCl, is an example of which type of reaction? (1) Double displacement reaction (2) Combination reaction (3) Single displacement reaction (4) Decomposition reaction

Last Answer : (3) Single displacement reaction Explanation: This reaction is an example of single displacement reaction. In Substitution or Single Replacement Reactions, a single free element replaces or is substituted for one of the elements in a compound.

What information do you get from the following chemical equation: Zn(s) + 2HCl (dil) → ZnCl2 (aq) + H2(g)

Description : What information do you get from the following chemical equation: Zn(s) + 2HCl (dil) → ZnCl2 (aq) + H2(g)

Last Answer : This gives zinc chloride and hydrogen. The word equation is: Zinc + Hydrochloric acid → Zinc chloride + Hydrogen Formulae for the products are ZnCl2 and H2

Naphthalene undergoes reduction with H2 in the presence of Ni catalyst at high temperature and pressure to give (a) Phthalic acid (b) Decalin (c) Benzoic acid (d) Tetralin

Description : Naphthalene undergoes reduction with H2 in the presence of Ni catalyst at high temperature and pressure to give (a) Phthalic acid (b) Decalin (c) Benzoic acid (d) Tetralin

Last Answer : Decalin

Benzene reacts with H2 at 150°C at 30 atm in the presence of Ni catalyst to give (a) Cyclohexane (b) Cyclohexene (c) n-Hexane (d) No reaction occurs

Description : Benzene reacts with H2 at 150°C at 30 atm in the presence of Ni catalyst to give (a) Cyclohexane (b) Cyclohexene (c) n-Hexane (d) No reaction occurs

Last Answer : Cyclohexane

Reduction of acetaldehyde with H2/Ni gives (a) Ethyl alcohol (b) Acetic acid (c) Ethylene (d) Ethane

Description : Reduction of acetaldehyde with H2/Ni gives (a) Ethyl alcohol (b) Acetic acid (c) Ethylene (d) Ethane

Last Answer : Ethyl alcohol

The correct order of spin-only magnetic moments among the following is : (Atomic number : Mn=25,Co=27,Ni=28,Zn=30)

Description : The correct order of spin-only magnetic moments among the following is : (Atomic number : Mn=25,Co=27,Ni=28,Zn=30)

Last Answer : The correct order of spin-only magnetic moments among the following is : (Atomic number : Mn=25,Co=27,Ni=28,Zn=30) ... (4)]^(2-) gt [ZnCl_(4)]^(2-)`

The geometries of the ammonia complexes of `Ni^(2+),Pt^(2+) and Zn^(2+)`, respectively, are

Description : The geometries of the ammonia complexes of `Ni^(2+),Pt^(2+) and Zn^(2+)`, respectively, are

Last Answer : The geometries of the ammonia complexes of `Ni^(2+),Pt^(2+) and Zn^(2+)`, ... planar and octahedral D. octahedral , tetrahedral and square planar

What are half reactions for a galvanic cell with Zn and Ni electrons?

Description : What are half reactions for a galvanic cell with Zn and Ni electrons?

Last Answer : What is the answer ?

German Silver is an alloy of------? A. Zn + Ni B. Cu + Zn C. Cu + Ni (Answer) D. Cu + Sn E. None of these

Description : German Silver is an alloy of------? A. Zn + Ni B. Cu + Zn C. Cu + Ni (Answer) D. Cu + Sn E. None of these

Last Answer : C. Cu + Ni (Answer)

The trace metal present in insulin is (A) Cu (B) Zn (C) Fe (D) Ni

Description : The trace metal present in insulin is (A) Cu (B) Zn (C) Fe (D) Ni

Last Answer : (B) Zn

Carbon tetrachloride (CCl4 ) is the starting raw material for the manufacture of (A) Trichloroethylene (B) Perchloroethylene (C) Parathion (D) Methanol

Description : Carbon tetrachloride (CCl4 ) is the starting raw material for the manufacture of (A) Trichloroethylene (B) Perchloroethylene (C) Parathion (D) Methanol

Last Answer : (B) Perchloroethylene

What of the following reactions demonstrates a synthesis reaction A) Mg plus H2SO4 and gt MgSO4 plus H2 B) 2NaCl and gt 2Na plus Cl2 C) C plus O2 and gt CO2 D) Zn plus 2HCl and gt ZnCl2 plus H2?

Description : What of the following reactions demonstrates a synthesis reaction A) Mg plus H2SO4 and gt MgSO4 plus H2 B) 2NaCl and gt 2Na plus Cl2 C) C plus O2 and gt CO2 D) Zn plus 2HCl and gt ZnCl2 plus H2?

Last Answer : C+O2 →CO2

As the surface area of the Zn(s) used in the reaction Zn(s) + 2HCl(aq)--> ZnCl2(aq) + H2(g) is increased, the rate of the reaction willIncreaseDecreaseRemain the Same?

Description : As the surface area of the Zn(s) used in the reaction Zn(s) + 2HCl(aq)--> ZnCl2(aq) + H2(g) is increased, the rate of the reaction willIncreaseDecreaseRemain the Same?

Last Answer : An increase in surface area means an increase in the rate of reaction.

The metal that does not give H2 on treatment with dilute HCl is (a) Zn (b) Fe (c) Ag (d) Ca

Description : The metal that does not give H2 on treatment with dilute HCl is (a) Zn (b) Fe (c) Ag (d) Ca

Last Answer : Ans:(c)

Identify the compound X and A on the basis of the reaction given below. X +Zn A + H2 (a)X is Sodium hydroxide and A is sodium zincate (b)X is Sodium hydroxide and A is sodium chloride©X is sodium hyroxide and A is sodium ethanoate (d)Both a and c

Description : Identify the compound X and A on the basis of the reaction given below. X +Zn A + H2 (a)X is Sodium hydroxide and A is sodium zincate (b)X is Sodium hydroxide and A is sodium chloride©X is sodium hyroxide and A is sodium ethanoate (d)Both a and c

Last Answer : (a)X is Sodium hydroxide and A is sodium zincate

Starting raw material for the manufacture of Maleic anhydride is (A) n-butene (B) Benzene (C) Either (A) or (B) (D) Neither (A) nor (B)

Description : Starting raw material for the manufacture of Maleic anhydride is (A) n-butene (B) Benzene (C) Either (A) or (B) (D) Neither (A) nor (B)

Last Answer : (C) Either (A) or (B)

Match the following: Column I(reaction) (a) `H_(2)O_(2)+underset("2moles")(ClSO_(3)H) rarr` (b)`SO_(3)+HClrarr` c) `SO_(3)+HBr rarr` (d) `underset(("c

Description : Match the following: Column I(reaction) (a) `H_(2)O_(2)+underset("2moles")(ClSO_(3)H) rarr` (b)`SO_(3)+HClrarr` c) `SO_(3)+HBr rarr` (d) `underset(("c

Last Answer : Match the following: Column I(reaction) (a) `H_(2)O_(2)+underset("2moles")(ClSO_(3) ... chloride t)Hydrogen halide is obtained as the product.

Which alkyne yields propanoic acid as the only product upon treatment with ozone followed by hydrolysis? (a) 1-Butyne (b) 2-Hexyne (c) 1-Pentyne (d) 3-Hexyne

Description : Which alkyne yields propanoic acid as the only product upon treatment with ozone followed by hydrolysis? (a) 1-Butyne (b) 2-Hexyne (c) 1-Pentyne (d) 3-Hexyne

Last Answer : 3-Hexyne

Ozonolysis of 2-butyne gives (a) Formic acid (b) Propanoic acid (c) Acetic acid (d) Butanoic acid

Description : Ozonolysis of 2-butyne gives (a) Formic acid (b) Propanoic acid (c) Acetic acid (d) Butanoic acid

Last Answer : Acetic acid

Which of the following compounds does not react with ammoniacal AgNO3 solution? (a) Acetylene (b) 1-Butyne (c) Propyne (d) 2-Butyne

Description : Which of the following compounds does not react with ammoniacal AgNO3 solution? (a) Acetylene (b) 1-Butyne (c) Propyne (d) 2-Butyne

Last Answer : 2-Butyne

Among the compounds water, 1-butyne, 2-butyne, and ethane, which are stronger acids than ammonia? (a) 1-butyne and ethane (b) water and 1-butyne (c) water and ethane (d) 1-butyne and 2-butyne

Description : Among the compounds water, 1-butyne, 2-butyne, and ethane, which are stronger acids than ammonia? (a) 1-butyne and ethane (b) water and 1-butyne (c) water and ethane (d) 1-butyne and 2-butyne

Last Answer : water and 1-butyne

(a) Write the essential condition for the following reaction to take place: 2AgBr—-> 2Ag + Br2 Write one application of this reaction. (b) Complete the following chemical equation of a chemical reaction 2FeS04 — chemical-reactions-and-equations-chapter-wise-important-questions-class-10-science-5 (c) What happens when water is added to quick line. Write chemical equation. -Chemistry

Description : (a) Write the essential condition for the following reaction to take place: 2AgBr--> 2Ag + Br2 Write one application of this reaction. (b) Complete the following chemical equation of a chemical ... science-5 (c) What happens when water is added to quick line. Write chemical equation. -Chemistry

Last Answer : Answer. This reaction is used in photography. (c) Slaked lime is formed with hissing sound and lot of heat is envolved.