995 + Interview Questions in HYDROCARBONS IN GENERAL AWARENESS Page 3 InterviewSolution

101.	Define: Polymerization
Answer» The process in which large number of small molecules join together and form very large molecules with repeating units is called polymerization.

Discussion

102.	During clhorination of methane to methyl chloride, the propagation step is represented byA. `Cl-Cl rarr overset(.)(C)l+overset(.)(C)l`B. `Coverset(.)(H)_(3)+overset(.)(C)lrarrCH_(3)Cl`C. `CH_(4)+overset(.)(C)l rarr Coverset(.)(H)_(3)+HCl`D. `overset(.)(C)l+overset(.)(C)lrarr Cl-Cl`
Answer» Correct Answer - c c

Discussion

103.	Explain the mechanism of chlorination of methane, according to Free Radical.
Answer» Mechanism of chlorination of methane involves three types. Step 1. Initiation: Chlorine absorbs energy and undergoes homolysis to give chlorine free radicals. Cl - Cl \(\overset{hy}{\longrightarrow}\) 2Cl^• Step 2 : Propagation: Chlorine free radical reacts with methane to give methyl free radical. Cl^• + CH₄ → CH₃^• + HCl The methyl free radical reacts with chlorine to form methyl chloride and chlorine free radical. CH₃^• + Cl₂ → CH₃Cl + Cl^• Step 3 : Termination: Free radials combine to form stable products. Cl^• + Cl^• → Cl₂(Chlorine) CH₃^• + CH₃^• → C₂H₆(Ethane) CH₃^• + Cl^• → CH₃Cl (Methyl Chloride)

103.

Explain the mechanism of chlorination of methane, according to Free Radical.

Answer»

Mechanism of chlorination of methane involves three types.

Step 1. Initiation: Chlorine absorbs energy and undergoes homolysis to give chlorine free radicals.

Cl - Cl \(\overset{hy}{\longrightarrow}\) 2Cl^•

Step 2 : Propagation: Chlorine free radical reacts with methane to give methyl free radical.

Cl^• + CH₄ → CH₃^• + HCl

The methyl free radical reacts with chlorine to form methyl chloride and chlorine free radical.

CH₃^• + Cl₂ → CH₃Cl + Cl^•

Step 3 : Termination: Free radials combine to form stable products.

Cl^• + Cl^• → Cl₂(Chlorine)

CH₃^• + CH₃^• → C₂H₆(Ethane)

CH₃^• + Cl^• → CH₃Cl (Methyl Chloride)

Discussion

104.	Arrange the correct sequence for mechanism of chlorination of methane. I. `CH_(4)+Cl^() overset(hv)rarroverset()CH_(3)+H-Cl` II. `Cl-Cl overset(hv)rarr 2overset()Cl` III. `overset()CH_(3)+Cl_(2)rarrCH_(3)-Cl+Cl^()` (IV) `overset()Cl+overset()Cl rarrCl-Cl` `overset()CH_(3)+overset(*)CH_(3) rarr CH_(3)-CH_(3)` Choose the correct option isA. II, I, III and IVB. I, II, III and IVC. IV, III, II and ID. II, III, I and IV
Answer» Correct Answer - A

Discussion

105.	Which of the following cannot be considered as a step of mechanism in chain reaction of methane with `Cl_(2)`?A. `Cl_(2) rarr Cl^(.)`B. `CH_(4)+Cl^(.) rarr CH_(3)Cl+H^(.)`C. `Cl^(.) +CH^(4) rarr CH_(3)^(.)+HCl`D. `Cl^(.)+CH_(3)^(.)rarr CH_(3)Cl`
Answer» Correct Answer - b b

Discussion

106.	1,1-Dibromoethane when heated with zinc dust producesA. Ethyl bromideB. EtheneC. Vinyl bromideD. 2-Butene
Answer» Correct Answer - D `underset("1-1-Dibromoethane")(CH_(3)-underset(Br)underset(\|)overset(H)overset(\|)(C)-Br)+underset("1-1-Dibromoethane")(2Zn+Br-underset(Br)underset(\|)overset(H)overset(\|)(C)-CH_(3))` `underset(Delta)to underset("2-Butene")(CH_(3)-overset(H)overset(\|)(C)=-overset(H)overset(\|)(C)-CH_(3)) underset(-H_(3)BO_(3))overset(+3H_(2)O_(2)//OH^(-))to underset("1-Propanol")(3CH_(3)-CH_(2)-CH_(2)-OH)`

Discussion

107.	Which of the following has maximum boiling point ?A. `n-`octaneB. iso`-` octaneC. `2,2,3,4-`tetramethyl butaneD. `n-`butane
Answer» Correct Answer - a `n-` octane Boiling point depends on molecular mass. Greater the molecular mass, higher will be boiling point Boiling point also depends on the structure. If two compounds have same molecular mass, then straight chain or linear compound has higher boiling point.

Discussion

108.	Ethylene reacts with `Br_(2)` to give 1,2-dibromoethane.The anti addition takes place due to the formation of which intermediate?A. `CH_(2)Br-overset(+)CH_(2)`B. C. `BrCH-CH^(+)`D.
Answer» Correct Answer - D Hologenation at alkene proceed through cyclic holonium ion.

Discussion

109.	Formation of free radical tkes place with absorption of minium energy in th formation of :A. B. C. D.
Answer» Correct Answer - D Compound can give `3^(@)` radical Which is highly stabilise

Discussion

110.	A mixture of ethyl bromide and methyl bromide is subjected to Wurtz reaction. The mixture of alkanes so formed, consists ofA. propane and butaneB. ethane and propaneC. ethane, propane and butaneD. ethane and butane
Answer» Correct Answer - C `CH_(3)CH_(2)BR+2Na+BrCH_(3) overset("Dry ether")rarr underset("Propane")(CH_(3)CH_(2)CH_(3))+2NaBr` `CH_(3)CH_(2)Br+2Na+BrCH_(2)CH_(3) overset("Dry ether")rarr underset("Butane")(CH_(3)CH_(2)CH_(2)CH_(3))+2NaBr` `CH_(3)Br+2Na+BrCH_(3) overset("Dry ether")rarr underset("Ethane")(CH_(3)CH_(3))+2NaBr`

Discussion

111.	Assertion: Wurtz reaction is not preferred for the preparation of alkanes containing odd number of carbon atoms. Reason: It is not possible to prepare alkanes with odd number of carbon atoms through wurtz reaction.A. If both assertion and reson are true and reason is the correct explanation of assertionB. If both assertion and reason are true but reason is not the correct explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false.
Answer» Correct Answer - C Wurtz reaction is not preferred for the preparation of alkanes containing odd number of carbon atoms since many side products are formed and a mixture of alkanes is formed because both alkyl halides react with each other and also with themselves.

Discussion

112.	Electrolysis of a concentrated aqueous solution of a compound gave `C_2H_6` on anode. The compound isA. `CH_3COOK`B. `CH_3CH_2COOK`C. `CH_3COOC_2H_5`D. `CH_3OCH_3`
Answer» Correct Answer - A `2CH_3COOK+2H_2Ooverset"Electrolysis"to ubrace(CH_3-CH_3+2CO_2)_"Anode"+ubrace(2KOH+H_2)_"Cathode"`

Discussion

113.	Electrolysis of an aqueous solution of sodium butanoate gives main product-A. octaneB. heptaneC. hexaneD. butane
Answer» Correct Answer - C

Discussion

114.	What is the chief product obtained when `n-`butane is treated with `Br_(2)` in the presence of light at `130^(@)C`?A. `CH_(3)-CH_(2)-CHBr-CH_(3)`B. `(CH_(3))_(2)CHCH_(2)Br`C. `(CH_(3))_(3)CBr`D. `CH_(3)-CH_(2)-CH_(2)-CH_(2)-Br`
Answer» Correct Answer - a `Br_(2)` has a much regioselectivity so chief product formed is `2-`bromobutane.

Discussion

115.	In Wurtz reaction if we take `CH_(3)Cl &C_(2)H_(5)Cl` then product will beA. propane+ethaneB. propaneC. propane+Ethane+Butane+EtheneD. Propane+Butane
Answer» Correct Answer - C

Discussion

116.	Which of the following should be subjected to Wurtz reaction to obtain the best yield of n-hexane?A. Ethyl chloride and n-butyl chlorideB. Methyl bromide and n-propyl bromideC. n-Propyl bromideD. Ethyl bromide and n-butyl bromide
Answer» Correct Answer - C

Discussion

117.	Butane cannot be obtained by-A. Action of soda lime on sodium butanoateB. Clemmensen reduction (Zn amalgam in conc. HCl) of butanoneC. Action of wter on butyl magnesium iodideD. sabatier senderens hydrogenation of butene.
Answer» Correct Answer - A

Discussion

118.	`C_(2)H_(6)+SO_(2)+Cl_(2)overset("U.V. Light")to` product. In this reaction product will be-A. `C_(2)H_(4)`B. `CH_(3)CH_(2)Cl`C. `CH_(3)CH_(2)SO_(2)Cl`D. `C_(2)H_(2)`
Answer» Correct Answer - C

Discussion

119.	The reaction conditions leading to the best yield of `C_(2)H_(5)Cl` areA. `C_(2)H_(6)("excess")+Cl_(2)overset("u.v. light")to`B. `C_(2)H_(6)+Cl_(2)overset("dark room temp.")to`C. `C_(2)H_(6)+Cl_(2)("Excess")overset("u.v. light")to`D. `C_(2)H_(6)+Cl_(2)overset("u.v. light")to`
Answer» Correct Answer - A

Discussion

120.	The reaction conditions leading to the best yield of `C_(2)H_(5)Cl` areA. `C_(2)H_(6)("excess")+Cl_(2)overset("UV light")to`B. `C_(2)H_(6)+Cl_(2)underset("room temperature")overset("dark")to`C. `C_(2)H_(6)+Cl_(2)("excess") overset("UV light")to`D. `C_(2)H_(6)+Cl_(2) overset("UV light")to`
Answer» Correct Answer - A To get best yeild of `C_(2)H_(5)Cl, C_(2)H_(6)` should be in excess and the reaction is carried out in the presence of u.v. light.

Discussion

121.	2-Methylbutane on reaction with bromine in the presence of sunlight gives mainly-A. 1-bromo-2-methylbutaneB. 2-bromo-2-methylbutaneC. 2-bromo-3-methylbutaneD. 1-bromo-3-methylbutane
Answer» Correct Answer - B `CH_(3)-overset(CH_(3))overset(\|)(CH)-CH_(2)CH_(3)-Br_(2) overset(hv)to` `CH_(3)-underset(Br)underset(\|)overset(CH_(3))overset(\|)(C)-CH_(2)CH_(3)("tertiary product")`

Discussion

122.	`HBr` reacts with `CH_(2)=CH-OCH_(3)` under anhydrous conditions at room temperature to give:A. `CH_(3)CHO` and `CH_(3)OH`B. `BrCH_(2)CHO` and `CH_(3)OH`C. `BrCH_(2)-CH_(2)-O-CH_(2)`D. `H_(3)C-CHBr-OCH_(3)`
Answer» Correct Answer - D

Discussion

123.	Number of isomers which can be theoreticaly obtained on monochlorination of `2-` methylbutane is `:`A. 1B. 2C. 3D. 4
Answer» Correct Answer - d d

Discussion

124.	Assertion `:` `1,3-` Butadiene is the monomer for natural rubber. Reason `:` Natural rubber is formed though anionic addition polymerization.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true.
Answer» Correct Answer - c Natural rubber is polymer of isoprene. Thus assertion is false. Further the reason is also false because `1,3-` butadine undergoes free radical polymerisation rather than anionic.

Discussion

125.	Match the hydrocarbons in Column I with the boiling points given in Column II.Column IColumn II(i) n–Pentane(a) 282.5 K(ii) iso-Pentane(b) 309 K(iii) neo-Pentane(c) 301 K
Answer» (i) → (b) (ii) → (c) (iii) → (a)

Discussion

126.	LPG containsA. methaneB. ethaneC. butaneD. None of these
Answer» Correct Answer - C LPG (Liquified petroleum gas) contains almost 96% n-butane.

Discussion

127.	What are the main components of LPG?
Answer» Butane and isobutene.

Discussion

128.	What are the main constituent of LPG?
Answer» Butane and isobutane . Both these isomers can be easily liquified and hence can be conveniently transported in iron cylinder.

Discussion

129.	Assertion `:` Iodination of alkane is carried out in presence of iodic acid. Reason`:` Iodine is an oxidizing agent.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true.
Answer» Correct Answer - a Assertion and Reason are true and Reason is the correct explanation of Assertion.

Discussion

130.	In the alkane H3C – CH2 – C(CH3)2 – CH2 – CH(CH3)2, identify 1°,2°,3° carbon atoms and give the number of H atoms bonded to each one of these.
Answer» 15 H attached to five 1⁰ carbon. 4H attached to ten 2⁰ carbons 1H attached to one 3⁰ carbon.

130.

In the alkane H3C – CH2 – C(CH3)2 – CH2 – CH(CH3)2, identify 1°,2°,3° carbon atoms and give the number of H atoms bonded to each one of these.

Answer»

15 H attached to five 1⁰ carbon.

4H attached to ten 2⁰ carbons

1H attached to one 3⁰ carbon.

Discussion

131.	Which alyne yields butanoic acid `(CH_(3)CH_(2)CH_(2)CO_(2)H)` as the only organic product on treatment with ozone followed by the hydrolysis?A. 1-ButyneB. 4-OctyneC. 1-PentyneD. 2-Hexyne
Answer» Correct Answer - b Symmetrical alkyne will give aicd only. (i.e.,4-octyne)

Discussion

132.	Assertion: Sodium salt of butanoic acid on heating with soda lime gives butane. Reason: Decarboxylation reaction yields alkanes having same number of carbon atoms as the parent acid.A. If both assertion and reson are true and reason is the correct explanation of assertionB. If both assertion and reason are true but reason is not the correct explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false.
Answer» Correct Answer - D Decarboxylation reaction gives alkanes having one carbon atom less than the carboxylic acid. Therefore, sodium salt of butanoic acid on heating with soda lime gives propane.

Discussion

133.	Which of the following compounds on decarboxylation with soda-lime will give toluene ?A. Phenylacetic acidB. o-Toluic acidC. m-Toluic acidD. p-Toluic acid
Answer» Correct Answer - A::B::C::D

Discussion

134.	Ethylene combines with sulphur monochloride to form.A. mustard gasB. saccharineC. lewsiteD. none of these
Answer» Correct Answer - C `underset("Mustard gas")((CH_(2)-CH_(2)-Cl)_(2)S`

Discussion

135.	Westrosol has the following formulaA. `CHCl=C Cl_(2)`B. `C Cl_(2)-C Cl_(3)`C. `Cl_(2)CF_(2)`D. `Cl_(3)C-NO_(2)`
Answer» Correct Answer - A

Discussion

136.	The correct order of increasing basicity of the given conjugate bases `(R=CH_3)` isA. `RCOO^(-) lt HC -=C^(-) lt NH_2^(-) lt R^(-)`B. `RCOO^(-) lt HC -=C^(-) lt R^(-) lt NH_2^-`C. `R^(-) lt HC-=C^(-) lt RCOO^(-) lt NH_2^(-)`D. `RCOO^(-) lt NH_2^(-) lt HC -=C^(-) lt R^(-)`
Answer» Correct Answer - A

Discussion

137.

You are given jars containing ethane, ethylene and acetylene. How will you identify each by chemical tests?

Answer»

S. No.	Test	Ethane	Ethane	Acetylene
1.	Add bromine water	No effect	Decolorised	Decolorised
2.	Add ammonical silver nitrate solution.	No effect	No effect	White ppt. of silver acetylide (AgC ≡ CAg is formed.
3.	Add ammonical cuprous chloride solution	No effect	No effect	Red precipitate of cuprous (acetylide) (CuC ≡ CCu is formed.

Discussion

138.	The chemical and the reaction conditions required for the preparation of ethane areA. `C_(2)H_(5)I,Zn-Cu,C_(2)H_(5)OH`B. `CH_(3)Cl,Na,H_(2)O`C. `KOOC-CH=CH-COOK,"electrolysis"`D. `CH_(3)CO_(2)Na, NaOH,CaO,Delta`
Answer» Correct Answer - A `CH_(3)CH_(2)-I overset(Zn-Cu,C_(2)H_(5)OH)to CH_(3)CH_(3)+HI`

Discussion

139.	Match the reaction given in Column-I to its name in Column-II
Answer» Correct Answer - A::B::C::D

Discussion

140.	Match the given compound in Column -I to their total possible monohalogenated product (number) in Column-II (excluding stereoisomers)
Answer» Correct Answer - A::B::C::D

Discussion

141.	The conversion of 2,3-dibromobutane to 2-butene with Zn isA. Redox reactionB. `alpha`-EliminationC. `beta`-EliminationD. Both `alpha`-elimination and redox reaction
Answer» Correct Answer - A `CH_(3)-overset(Br)overset(\|)(CH)-overset(Br)overset(\|)(CH)-CH_(3)+Zn to ZnBr_(2)+CH_(3)-CH=CH-CH_(3)` It is an example of redox reaction.

Discussion

142.	4-Pentenoic acid when treated with `I_(2)` and `NaHCO_(3)` gives:A. 4,5-diiodopentanoic acidB. 5-iodomethyl-dihydrofuran-2-oneC. 5-iodo-tetrahydropyran-2-oneD. 4-pentenolyiodide
Answer» Correct Answer - b Iodo lactonization.

Discussion

143.	Bromination of (E)-2-butenedioic acid givesA. (2R, 3S)-2, 3-dibromosuccinic acidB. (2R, 3R)-2, 3-dibromosuccinic acidC. a mixture of (2R, 3R) and (2S, 3S)-2,3-dibromosuccinic acidD. (2S, 3S)-2,3-dibromosuccinic acid
Answer» Correct Answer - a Anti-addtion take place.

Discussion

144.	The major product formed during the reaction of 1-methyl cyclopentene with `CH_(3)CO_(3)H` isA. B. C. D.
Answer» Correct Answer - c Exoxide will form.

Discussion

145.	The number of chain isomers possible for hydrocarbon `C_(5)H_(12)` isA. 3B. 5C. 4D. 6
Answer» Correct Answer - A `C_(5)H_(12): underset("n-Pentane")(CH_(3)CH_(2)CH_(2)CH_(2)CH_(3))` `underset("2-Methylbutane (iso-Pentane)")(CH_(3)-underset(CH_(3))underset(\|)(C)H-CH_(2)-CH_(3))" "underset("2,2-Dimethylpropane (neo-Pentane)")(CH_(3)-underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)(C)-CH_(3))`

Discussion

146.	How many geometrical isomers are possible for the given compound? `CH_(3)-CH=CH-CH=CH-C_(2)H_(5)`A. FourB. ThreeC. TwoD. Five
Answer» Correct Answer - A

Discussion

147.	The potential energy difference between the staggered and eclipsed conformation of ethane is…………
Answer» The potential energy difference between the staggered and eclipsed conformation of ethane is 12.5 kJ /mol.

Discussion

148.	Assertion: Staggered conformation of ethane is most stable while eclipsed conformation is least stable. ltbr. Reason: Staggered form has the least torsional strain and the eclipsed form has the maximum torsional strain.A. If both assertion and reson are true and reason is the correct explanation of assertionB. If both assertion and reason are true but reason is not the correct explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false.
Answer» Correct Answer - A

Discussion

149.	How many bonds are there in A. `14 sigma,8pi`B. `18 sigma,8pi`C. `19 sigma,4pi`D. `14 sigma,2pi`
Answer» Correct Answer - C

Discussion

150.	Of the five isomeric hexanes, the isomer which can give two monochlorinated compounds isA. n-HexaneB. 2,3-dimethyl-butaneC. 2,2-dimethyl-butaneD. 2-methyl pentane
Answer» Correct Answer - B

Discussion

Explore topic-wise InterviewSolutions in .

Define: Polymerization

During clhorination of methane to methyl chloride, the propagation step is represented byA. `Cl-Cl rarr overset(.)(C)l+overset(.)(C)l`B. `Coverset(.)(H)_(3)+overset(.)(C)lrarrCH_(3)Cl`C. `CH_(4)+overset(.)(C)l rarr Coverset(.)(H)_(3)+HCl`D. `overset(.)(C)l+overset(.)(C)lrarr Cl-Cl`

Explain the mechanism of chlorination of methane, according to Free Radical.

Which of the following cannot be considered as a step of mechanism in chain reaction of methane with `Cl_(2)`?A. `Cl_(2) rarr Cl^(.)`B. `CH_(4)+Cl^(.) rarr CH_(3)Cl+H^(.)`C. `Cl^(.) +CH^(4) rarr CH_(3)^(.)+HCl`D. `Cl^(.)+CH_(3)^(.)rarr CH_(3)Cl`

1,1-Dibromoethane when heated with zinc dust producesA. Ethyl bromideB. EtheneC. Vinyl bromideD. 2-Butene

Which of the following has maximum boiling point ?A. `n-`octaneB. iso`-` octaneC. `2,2,3,4-`tetramethyl butaneD. `n-`butane

Ethylene reacts with `Br_(2)` to give 1,2-dibromoethane.The anti addition takes place due to the formation of which intermediate?A. `CH_(2)Br-overset(+)CH_(2)`B. C. `BrCH-CH^(+)`D.

Formation of free radical tkes place with absorption of minium energy in th formation of :A. B. C. D.

A mixture of ethyl bromide and methyl bromide is subjected to Wurtz reaction. The mixture of alkanes so formed, consists ofA. propane and butaneB. ethane and propaneC. ethane, propane and butaneD. ethane and butane

Electrolysis of a concentrated aqueous solution of a compound gave `C_2H_6` on anode. The compound isA. `CH_3COOK`B. `CH_3CH_2COOK`C. `CH_3COOC_2H_5`D. `CH_3OCH_3`

Electrolysis of an aqueous solution of sodium butanoate gives main product-A. octaneB. heptaneC. hexaneD. butane

What is the chief product obtained when `n-`butane is treated with `Br_(2)` in the presence of light at `130^(@)C`?A. `CH_(3)-CH_(2)-CHBr-CH_(3)`B. `(CH_(3))_(2)CHCH_(2)Br`C. `(CH_(3))_(3)CBr`D. `CH_(3)-CH_(2)-CH_(2)-CH_(2)-Br`

In Wurtz reaction if we take `CH_(3)Cl &C_(2)H_(5)Cl` then product will beA. propane+ethaneB. propaneC. propane+Ethane+Butane+EtheneD. Propane+Butane

Which of the following should be subjected to Wurtz reaction to obtain the best yield of n-hexane?A. Ethyl chloride and n-butyl chlorideB. Methyl bromide and n-propyl bromideC. n-Propyl bromideD. Ethyl bromide and n-butyl bromide

Butane cannot be obtained by-A. Action of soda lime on sodium butanoateB. Clemmensen reduction (Zn amalgam in conc. HCl) of butanoneC. Action of wter on butyl magnesium iodideD. sabatier senderens hydrogenation of butene.

`C_(2)H_(6)+SO_(2)+Cl_(2)overset("U.V. Light")to` product. In this reaction product will be-A. `C_(2)H_(4)`B. `CH_(3)CH_(2)Cl`C. `CH_(3)CH_(2)SO_(2)Cl`D. `C_(2)H_(2)`

The reaction conditions leading to the best yield of `C_(2)H_(5)Cl` areA. `C_(2)H_(6)("excess")+Cl_(2)overset("u.v. light")to`B. `C_(2)H_(6)+Cl_(2)overset("dark room temp.")to`C. `C_(2)H_(6)+Cl_(2)("Excess")overset("u.v. light")to`D. `C_(2)H_(6)+Cl_(2)overset("u.v. light")to`

The reaction conditions leading to the best yield of `C_(2)H_(5)Cl` areA. `C_(2)H_(6)("excess")+Cl_(2)overset("UV light")to`B. `C_(2)H_(6)+Cl_(2)underset("room temperature")overset("dark")to`C. `C_(2)H_(6)+Cl_(2)("excess") overset("UV light")to`D. `C_(2)H_(6)+Cl_(2) overset("UV light")to`

2-Methylbutane on reaction with bromine in the presence of sunlight gives mainly-A. 1-bromo-2-methylbutaneB. 2-bromo-2-methylbutaneC. 2-bromo-3-methylbutaneD. 1-bromo-3-methylbutane

`HBr` reacts with `CH_(2)=CH-OCH_(3)` under anhydrous conditions at room temperature to give:A. `CH_(3)CHO` and `CH_(3)OH`B. `BrCH_(2)CHO` and `CH_(3)OH`C. `BrCH_(2)-CH_(2)-O-CH_(2)`D. `H_(3)C-CHBr-OCH_(3)`

Number of isomers which can be theoreticaly obtained on monochlorination of `2-` methylbutane is `:`A. 1B. 2C. 3D. 4

Match the hydrocarbons in Column I with the boiling points given in Column II.Column IColumn II(i) n–Pentane(a) 282.5 K(ii) iso-Pentane(b) 309 K(iii) neo-Pentane(c) 301 K

LPG containsA. methaneB. ethaneC. butaneD. None of these

What are the main components of LPG?

What are the main constituent of LPG?

In the alkane H3C – CH2 – C(CH3)2 – CH2 – CH(CH3)2, identify 1°,2°,3° carbon atoms and give the number of H atoms bonded to each one of these.

Which alyne yields butanoic acid `(CH_(3)CH_(2)CH_(2)CO_(2)H)` as the only organic product on treatment with ozone followed by the hydrolysis?A. 1-ButyneB. 4-OctyneC. 1-PentyneD. 2-Hexyne

Which of the following compounds on decarboxylation with soda-lime will give toluene ?A. Phenylacetic acidB. o-Toluic acidC. m-Toluic acidD. p-Toluic acid

Ethylene combines with sulphur monochloride to form.A. mustard gasB. saccharineC. lewsiteD. none of these

Westrosol has the following formulaA. `CHCl=C Cl_(2)`B. `C Cl_(2)-C Cl_(3)`C. `Cl_(2)CF_(2)`D. `Cl_(3)C-NO_(2)`

The correct order of increasing basicity of the given conjugate bases `(R=CH_3)` isA. `RCOO^(-) lt HC -=C^(-) lt NH_2^(-) lt R^(-)`B. `RCOO^(-) lt HC -=C^(-) lt R^(-) lt NH_2^-`C. `R^(-) lt HC-=C^(-) lt RCOO^(-) lt NH_2^(-)`D. `RCOO^(-) lt NH_2^(-) lt HC -=C^(-) lt R^(-)`

You are given jars containing ethane, ethylene and acetylene. How will you identify each by chemical tests?

The chemical and the reaction conditions required for the preparation of ethane areA. `C_(2)H_(5)I,Zn-Cu,C_(2)H_(5)OH`B. `CH_(3)Cl,Na,H_(2)O`C. `KOOC-CH=CH-COOK,"electrolysis"`D. `CH_(3)CO_(2)Na, NaOH,CaO,Delta`

Match the reaction given in Column-I to its name in Column-II

Match the given compound in Column -I to their total possible monohalogenated product (number) in Column-II (excluding stereoisomers)

The conversion of 2,3-dibromobutane to 2-butene with Zn isA. Redox reactionB. `alpha`-EliminationC. `beta`-EliminationD. Both `alpha`-elimination and redox reaction

4-Pentenoic acid when treated with `I_(2)` and `NaHCO_(3)` gives:A. 4,5-diiodopentanoic acidB. 5-iodomethyl-dihydrofuran-2-oneC. 5-iodo-tetrahydropyran-2-oneD. 4-pentenolyiodide

Bromination of (E)-2-butenedioic acid givesA. (2R, 3S)-2, 3-dibromosuccinic acidB. (2R, 3R)-2, 3-dibromosuccinic acidC. a mixture of (2R, 3R) and (2S, 3S)-2,3-dibromosuccinic acidD. (2S, 3S)-2,3-dibromosuccinic acid

The major product formed during the reaction of 1-methyl cyclopentene with `CH_(3)CO_(3)H` isA. B. C. D.

The number of chain isomers possible for hydrocarbon `C_(5)H_(12)` isA. 3B. 5C. 4D. 6

How many geometrical isomers are possible for the given compound? `CH_(3)-CH=CH-CH=CH-C_(2)H_(5)`A. FourB. ThreeC. TwoD. Five

The potential energy difference between the staggered and eclipsed conformation of ethane is…………

How many bonds are there in A. `14 sigma,8pi`B. `18 sigma,8pi`C. `19 sigma,4pi`D. `14 sigma,2pi`

Of the five isomeric hexanes, the isomer which can give two monochlorinated compounds isA. n-HexaneB. 2,3-dimethyl-butaneC. 2,2-dimethyl-butaneD. 2-methyl pentane