995 + Interview Questions in HYDROCARBONS IN GENERAL AWARENESS Page 12 InterviewSolution

551.	To prepare a pure sample of n-hexane, using sodium metal as one reactant, the other reactant or reactants will be:A. ethyl bromide and n-butyl chlorideB. methyl bromide and n-pentyl bromideC. n-propyl chlorideD. ethyl bromide and n-butyl bromide
Answer» Correct Answer - C

Discussion

552.	Choose the correct reagent used in the conversion. A. `p-Br_(2),q-"alc. "KOH, r-NaOH,s-Al_(2)O_(3)`B. `p-HB r , "alc. "KOH, r-CaC_(2), s-KMnO_(4)`C. `p-HBr,q-"alc. "KOH,r-NaNH_(2),s-"red hot iron tube"`D. `p-Br_(2),q-"alc. "KOH, r-NaNH_(2),s-"red hot iron tube"`
Answer» Correct Answer - D

Discussion

553.	At room temperature , the eclipsed and staggered forms of ethane cannot be isolated becauseA. they interconvert rapidlyB. both the conformers are equally stableC. the energy difference between the conformers is largeD. there is a large energy barrier of rotation about the `sigma`-bond
Answer» Correct Answer - A

Discussion

554.	Nucleophiles and electrophiles are reaction intermediates having electron rich and electron deficient centres respectively. Hence, they tend to attack electron deficient and electron rich centres respectively. Classify the following species as electrophiles and nucleophiles. (i)`H_3CO^-` , (ii)`H_3C-oversetoverset(O)(\|\|)C-O^-` , (iii)`oversetdot(Cl)` , (iv)`Cl_2C` , (v) `(H_3C)_3C^+` , (vi)`Br^-` , (vii)`H_3COH` , (viii)`R-NH-R`
Answer» Nucleophiles are electron-rich species . They may be neutral or negatively charge , i.e., (i)`H_3CO^-` , (ii)`H_3C-oversetoverset(O)(\|\|)C-O^-` , (vi)`Br^-` , (vii)`H_3C-underset(ddot)overset(ddot) O-H`, (viii)`R-oversetddot(NH)-R` Electrophiles are electron-deficient species. They may be neutral or positively charged, i.e., (iii)`oversetddot(Cl)` , (iv)`Cl_2C` : , (v)`(H_3C)_3C^+`

Discussion

555.	Benzene is obtained by fractional distillation ofA. Heavy oilB. anthracene oilC. Middle oilD. Light oil
Answer» Correct Answer - D Benzene is obtained by the fractional distillation of light oil.

Discussion

556.	The IUPAC name if the compound having the formula `(CH_(3)_(3)-C-CH=CH_(2)` isA. 1,1-Dimethyl-3-buteneB. 1,1,1-Trimethyl-3-propeneC. 3,3-Dimetyl-1-buteneD. 3,3,3-Triemthyl1,1-propene.
Answer» Correct Answer - C `overset(4)(CH_(3))-underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)(overset(3)C)-overset(2)(CH)=overset(1)(CH_(2))`

Discussion

557.	Which among the following represents the correct reaction of general combusition?A. `C_(x)H_(y)+(x+(Y)/(4))O_(2)rarrxCO_(2)+(Y)/(2)H_(2)O`B. `C_(x)H_(y)+(2x+(y)/(4))O_(2)rarrxCO_(2)+(Y)/(2)H_(2)O`C. `C_(x)H_(y)+(x+(Y)/(2))O_(2)rarrsCO_(2)+(Y)/(2)H_(2)O`D. `C_(x)Y_(y)+(x+(Y)/(4))O_(2)rarrxCO_(2)+(Y)/(4)H_(2)O`
Answer» Correct Answer - A

Discussion

558.	Carbide which react with water to give propyne isA. `CaC_(2)`B. `Mg_(2)C_(3)`C. `SiC`D. `Al_(4)C_(3)`
Answer» Correct Answer - b `Mg_(2)C_(2)+4H_(2)O rarrCH_(3)C-=CH+2Mg(OH)_(2)`

Discussion

559.	Why do the C-C bonds rather than C-H bonds break during cracking of alkanes?
Answer» Since the bond dissociation energy of C-C bonds (348kj /mol) is lower than bond dissociation energy of C-H bonds (414kj/mol), therefore, during cracking of alkanes, C-C bonds break more early than C-H bonds.

Discussion

560.	Which of the following is not a petroleum product?A. GasolineB. Cooking gasC. Bees waxD. All are petroleum producers
Answer» Correct Answer - C

Discussion

561.	Whch of the following product is formed when acetylene is passed into a solution of curpours chloride in ammonium chloride?A. Vinyl acetyleneB. BenzeneC. CyclooctatetraeneD. Toulene
Answer» Correct Answer - A Acetylene polymerises in `Cu_(2)Cl_(2)//NH_(4)Cl` solution `CH-=CH+H-C-=CH overset(Cu_(2)Cl_(2))to underset("Vinyl acetylene")(CH_(2)=H-C-=C)`

Discussion

562.	Which of the following can be obtained from napth?A. Parffin waxB. NapthaleneC. Petroleum etherD. All
Answer» Correct Answer - C

Discussion

563.	Define the following terms with example.A. Wurtz Reaction. B. Chain Isomerism. C. Dihedral Angle.
Answer» (a) Wurtz Reaction: When alkyl halides react with sodium metal in the presence of dry ether the product obtained is alkanes with more no. of carbon atoms. E.g. CH₃ – Cl + 2Na +Cl – CH3 --------> 2NaCl + CH₃ – CH₃ (b) Chain Isomerism: The isomers which differ with respect to the nature of the carbon atom which may be either straight chain or branched chain. E.g. For C₄H₁₀ butane the two isomers obtained are CH₃CH₂CH₂CH₃ (c) Dihedral Angle:- The angle between the two non bonded hydrogen atoms of the two neighbouring carbon atoms in ethane is called Dihedral Angle.

563.

Define the following terms with example.A. Wurtz Reaction. B. Chain Isomerism. C. Dihedral Angle.

Answer»

(a) Wurtz Reaction: When alkyl halides react with sodium metal in the presence of dry ether the product obtained is alkanes with more no. of carbon atoms.

E.g. CH₃ – Cl + 2Na +Cl – CH3 --------> 2NaCl + CH₃ – CH₃

(b) Chain Isomerism: The isomers which differ with respect to the nature of the carbon atom which may be either straight chain or branched chain.

E.g. For C₄H₁₀ butane the two isomers obtained are

CH₃CH₂CH₂CH₃

(c) Dihedral Angle:- The angle between the two non bonded hydrogen atoms of the two neighbouring carbon atoms in ethane is called Dihedral Angle.

Discussion

564.	Gasoline contains hydrocarbons in the rangeA. C-7 to C-12B. C-12 to C-15C. C-4 to C-6D. C-5 to C-8
Answer» Correct Answer - A Factual questions.

Discussion

565.	The homolytic fission of hydrocarbons in the rangeA. Free radicalsB. CarbocationsC. CarbanionsD. Carbenes
Answer» Correct Answer - A Homolytic fission results in the formation of free radicals.

Discussion

566.	The principle constituents of petroleum areA. phenolsB. alcoholsC. hydrocarbonsD. unsaturated hydrocarbons only
Answer» Correct Answer - C

Discussion

567.	What do you mean by cracking?
Answer» The thermal decomposition of higher hydrocarbons into lower hydrocarbons in the presence or absence of a catalyst is called cracking.

Discussion

568.	What are the chief constituents of light oil fraction?
Answer» Benzene, toluene and xylenes.

Discussion

569.	The substance which has been assigned octane number of -45 isA. n-octaneB. n-heptaneC. n-nonaneD. none of these
Answer» Correct Answer - C

Discussion

570.	What type of hydrocarbons are present in high octane gasoline?
Answer» Branched chain aliphatic and/or aromatic hydrocarbons.

Discussion

571.	Anti knocking character of gasoline can be improved by the addition ofA. lead sulphhateB. lead bromideC. tetraethyl leadD. diethyl cadium
Answer» Correct Answer - C

Discussion

572.	1-Pentyne reacts with:A. SodiumB. sodamideC. Ammonical silver nitrateD. Ammonical cuprous chloride
Answer» Correct Answer - A::B::C::D

Discussion

573.	Which among the following is deactivating group ?A. `-Cl`B. `-OR`C. `-NH_(2)`D. `-NHR`
Answer» Correct Answer - a a

Discussion

574.	Which metal is used in wurtz reaction?
Answer» Sodium is used in wurtz reaction.

Discussion

575.	The rotation of C – C single bond leads to different isomenc structure called as ………
Answer» The rotation of C – C single bond leads to different isomenc structure called as conformers.

Discussion

576.	Which catalyst is used in Friedel’s craft reaction?
Answer» Anhydrous aluminium chloride.

Discussion

577.	Statement-I: Product of pyrolysis of Statement-II: C-H bond is weaker than C-D bond.A. If both statement-1 & statement-2 are true & the statement-II is a correct explanation of the statement-IB. If both statement-I & statement-II are true but statement-II si not a correct explanation of the statement-IC. If statement-I is true but the statement-II is false.D. If statement-I is false but the statement-II is true.
Answer» Correct Answer - B Pyrolysis of ester is syn elimination so the bond energy of C-H and C-D is not the reason.

Discussion

578.	Which of the following gieves `CH_(4)` when treated with water ?A. Aluminium carbideB. Calcium carbideC. Silicon carbideD. Iron carbide
Answer» Correct Answer - a `underset("Aluminium carbide")(Al_(4)C_(3)+6H_(2)O) rarrunderset("Methane")(3CH_(4)+2Al_(2)O_(3))`

Discussion

579.	Four structures are given in options (a) to (d) . Examine them and select the aromatic structures .A. B. C. D.
Answer» Correct Answer - A::C Cyclopropenyl cation (a) has completely delocalized `2pi`-electrons. Therefore , in accordance with Huckel rule, it is aromatic. Cyclooctatetraene is not planar and also it has `8pi`-electrons. Therefore, in accordance with Huckel rule , it is not aromatic. (c )Diphenyl has two benzene rings each one of which is planar and has 6 `pi`-electrons . Therefore, like benzene, it is also aromatic. (d)Cyclopropenyl anion although planar has only 4 `pi`-electron. Therefore, in accordance with Huckel rule, it is not aromatic.

Discussion

580.	Four structures are given in options (i) to (iv). Examine them and select the aromatic structures.
Answer» The correct answer is (i), (iii)

Discussion

581.	Define Aromatic Compounds.
Answer» The Compounds which gives pleasant smell.

Discussion

582.	Four structures are given in options (a) to (d). Examine them and select the aromatic structures(a)(b)(c)(d)
Answer» a and c, in both these options, rings are planar and follow (4n+ 2) pi electron rule.

Discussion

583.	Write IUPAC names of the following compounds :(i) (CH3)3CCH2C(CH3)3(ii) (CH3)2 C(C2H5)2(iii) tetra – tert-butylmethane
Answer» (i) 2,2,4,4-tetramethylpentane (ii) 3, 3-Dimethylpentane (iii) 3,3-Di-tert-butyl -2, 2, 4, 4 - tetramethylpentane

583.

Write IUPAC names of the following compounds :(i) (CH3)3CCH2C(CH3)3(ii) (CH3)2 C(C2H5)2(iii) tetra – tert-butylmethane

Answer»

(i) 2,2,4,4-tetramethylpentane

(ii) 3, 3-Dimethylpentane

(iii) 3,3-Di-tert-butyl -2, 2, 4, 4 - tetramethylpentane

Discussion

584.	n-propyl bromide on treatment with ethanolic potassium hydroxide producesA. propanol-1B. propeneC. propanol-2D. ethyl propyl ether
Answer» Correct Answer - B `underset("n-propyl bromide")(CH_(3)CH_(2)CH_(2)Br)underset(Alc.KOH)rarrunderset("Propene")(CH_(3)CH=CH_(2))`

Discussion

585.	Write IUPAC names of the following:(i) (CH3)3CCH2C(CH3)(ii) (CH3)2C(C2H5)2(iii) Tetra – tert – butyl methane
Answer» (i) 2, 2, 4, 4-Tetramethylpentane (ii) 3, 3-Dimethylpentane (iii) 2, 2, 4, 4-Tetramethyl-3, 3-di (2-methylpropyl) pentane

585.

Write IUPAC names of the following:(i) (CH3)3CCH2C(CH3)(ii) (CH3)2C(C2H5)2(iii) Tetra – tert – butyl methane

Answer»

(i) 2, 2, 4, 4-Tetramethylpentane

(ii) 3, 3-Dimethylpentane

(iii) 2, 2, 4, 4-Tetramethyl-3, 3-di (2-methylpropyl) pentane

Discussion

586.	How will you demonstrate that double bonds of benzene are somewhat different from that of olefins?
Answer» The double bonds of olefins decolorize bromine water and discharge the pink colour of Bayer's reagent while those of benzene not.

Discussion

587.	How will you separate propene from propyne?
Answer» By passing the mixture through ammonical silver nitrate solution when propyne reacts while propene passes over.

Discussion

588.	How will you demonstrate that double bonds of benzene are somewhat different from that of olefins?
Answer» The double bonds of olefins decolorize bromine water and discharge the pink colour of Bayer‘s reagent while those of benzene not.

Discussion

589.	What is Grignard reagent?
Answer» Alkyl magnesium halides

Discussion

590.	When acetylene is treated with `HBr` the pruduct isA. `CICH=CHAsCl_(2)`B. `CH_(2)=CHAsCl_(2)`C. `CH_(2)=CAsCl_(3)`D. `AsCl_(3)`
Answer» Correct Answer - A

Discussion

591.	Will the main product in the above reaction show geometrical isomerism?
Answer» No, the major product, i.e., 2-methylbut-2-ene does not show geometrical (or cis-trans) isomerism.

Discussion

592.	Which one of these will react with sodium metal-A. EthyneB. EtheneC. EthaneD. Ether
Answer» Correct Answer - A `CH-=CH+NatoCH-=C^(-)Na^(+)+1//2H_(2)uarr` ltBrgt Ethylene is more acidic there ethene, ethane and ether.

Discussion

593.	Amongst the given options, the compound in which all the atoms are in one plane in all the possible conformations (if any ), is (are)A. B. C. `H_2C=C=O`D. `H_2C=C=CH_2`
Answer» Correct Answer - B::C Along C-C single bond, numerous conformations are possible in 1,3-butadiene (a) . In some of these conformations , all the atoms may not lie in the same plane. In `CH_2=C=CH_2` (d), due to sp-hybridization of the central carbon, H-atoms on the terminal `CH_2` groups lie in perpendicular planes . However, in `CH_2=C=O` (c ), due to replacement of `CH_2` by O the two H-atoms on the `sp^2`-hybridized `CH_2` group lie in the same plane in which the two carbon and the oxygen atoms lie. In compound (b), due to linear structure of H-C`-=`C- portion of the molecule , the three H-atoms on -HC =`CH_2` portion always lie in the same plane. Thus, options (b) and (c ) are correct.

Discussion

594.	Consider the following reaction the major alkene product is `(CH_(3))_(3)C CH_(2)-underset(Br)underset(\|)(C(CH_(3))_(2)overset(base)to` the major alkene product is -A. `(CH_(3))_(3)C CH=C(CH_(3))_(2)`B. `(CH_(3))_(3)C CH_(2)overset(CH_(3))overset(\|)(C)=CH_(2)`C. `(CH_(3))_(2)C=overset(CH_(3))overset(\|)(C)-CH(CH_(3))_(2)`D. `CH_(2)=overset(CH_(3))overset(\|)(C)-overset(CH_(3))overset(\|)(C)HCH(CH_(3))_(2)`
Answer» Correct Answer - A More stable alkene will formed

Discussion

595.	Which of the following compound can be prepared from acetylene by carbonylation ?A. `CH_(3)-COOC_(2)H_(5)`B. `CH_(2)=CH-COOH`C. `CH_(3)CH_(2)-COOH`D. `CH_(3)-CH_(2)-COOCH_(3)`
Answer» Correct Answer - b The compound which can be prepared from acetylene by carbonylation is `CH_(2)=CH-COOH` `underset(acetyl en e)(H-C-=C-H)+CO+H_(2)O overset(BF_(3))underset(Ni(CO)_(4))rarr underset(acrylic acid)(CH_(2)=CH-COOH)`

Discussion

596.	Acetylene is prepared in the industry by the action of water on …………. (A) calcium carbonate (B) calcium carbide (C) mercuric chloride (D) calcium oxide
Answer» Correct option is: (B) calcium carbide \(\underset {Calcium\, Carbide}{CaC_2 + H_2O} \rightarrow HC \equiv \underset {Acetylene} {CH + Ca (OH)_2} \) (B) calcium carbide

596.

Acetylene is prepared in the industry by the action of water on …………. (A) calcium carbonate (B) calcium carbide (C) mercuric chloride (D) calcium oxide

Answer»

Correct option is: (B) calcium carbide

\(\underset {Calcium\, Carbide}{CaC_2 + H_2O} \rightarrow HC \equiv \underset {Acetylene} {CH + Ca (OH)_2} \)

(B) calcium carbide

Discussion

597.	From which one of the following both ethylene and acetylene could be prepared in a single step reaction ?A. `CH_3CH_2OH`B. `Br-CH_2-CH_2-Br`C. `CH_3CH_2Br`D. `Br-CH_2-CH_2-OH`
Answer» Correct Answer - B `BrCH_2-CH_2Br underset((-ZnBr_2))overset(Zn//CH_3OH, Delta)to CH_2=CH_2` `BrCH_2-CH_2Br overset(NaNH_2 "in liq."NH_3)to HC-=CH`

Discussion

598.	Which of the following is not an endothermic reaction ?A. Combustion of propaneB. Ethane to etheneC. DehydrogenationD. Change of chloring molecule into chlorine atoms.
Answer» Correct Answer - a The enthalpy of combustion, `i.e. Delta H` is always negative. It means combustion is an exothermic reaction.

Discussion

599.	Pick out the alkane while differs from the other members of the group.A. 2,2-dimethylpropaneB. pentaneC. 3-methylbutaneD. 2,2-dimethylbutane
Answer» Correct Answer - D (a),(b) and (c ) are all isomers but (d) is not .

Discussion

600.	Benzenesulphonic acid when heated with steam gives benzene but nitrobenzene does not. Why so ?
Answer» Sulphonation is a reversible reaction. When heated with excess of conc. `H_2SO_4`, the reaction moves in the forward direction giving benzenesulphonic acid and `H_2O`. However, when benzenesulphonic acid is heated with excess of steam , the reaction moves in the backward direction giving benzene and `H_2SO_4`. `underset"Benzene"(C_6H_6)+H_2SO_4 overset"Heat"to underset"Benzenesulphonic acid"(C_6H_5SO_3H)+H_2O` `underset"Benzenesulphonic acid"(C_6H_5SO_3H)+underset"Steam"(H_2O) overset"Heat"to underset"Benzene"(C_6H_6)+ H_2SO_4` In contrast, nitration is an irreversible reaction. Therefore, when nitrobenzene is heated with steam, backward reaction does not occur and hence nitrobenzene is recovered . `underset"Benzene"(C_6H_6)+underset"Conc."(HNO_3) overset(Conc. H_2SO_4)to underset"Nitrobenzene"(C_6H_5NO_2)+H_2O`

Discussion

Explore topic-wise InterviewSolutions in .

To prepare a pure sample of n-hexane, using sodium metal as one reactant, the other reactant or reactants will be:A. ethyl bromide and n-butyl chlorideB. methyl bromide and n-pentyl bromideC. n-propyl chlorideD. ethyl bromide and n-butyl bromide

Choose the correct reagent used in the conversion. A. `p-Br_(2),q-"alc. "KOH, r-NaOH,s-Al_(2)O_(3)`B. `p-HB r , "alc. "KOH, r-CaC_(2), s-KMnO_(4)`C. `p-HBr,q-"alc. "KOH,r-NaNH_(2),s-"red hot iron tube"`D. `p-Br_(2),q-"alc. "KOH, r-NaNH_(2),s-"red hot iron tube"`

At room temperature , the eclipsed and staggered forms of ethane cannot be isolated becauseA. they interconvert rapidlyB. both the conformers are equally stableC. the energy difference between the conformers is largeD. there is a large energy barrier of rotation about the `sigma`-bond

Benzene is obtained by fractional distillation ofA. Heavy oilB. anthracene oilC. Middle oilD. Light oil

The IUPAC name if the compound having the formula `(CH_(3)_(3)-C-CH=CH_(2)` isA. 1,1-Dimethyl-3-buteneB. 1,1,1-Trimethyl-3-propeneC. 3,3-Dimetyl-1-buteneD. 3,3,3-Triemthyl1,1-propene.

Carbide which react with water to give propyne isA. `CaC_(2)`B. `Mg_(2)C_(3)`C. `SiC`D. `Al_(4)C_(3)`

Why do the C-C bonds rather than C-H bonds break during cracking of alkanes?

Which of the following is not a petroleum product?A. GasolineB. Cooking gasC. Bees waxD. All are petroleum producers

Whch of the following product is formed when acetylene is passed into a solution of curpours chloride in ammonium chloride?A. Vinyl acetyleneB. BenzeneC. CyclooctatetraeneD. Toulene

Which of the following can be obtained from napth?A. Parffin waxB. NapthaleneC. Petroleum etherD. All

Define the following terms with example.A. Wurtz Reaction. B. Chain Isomerism. C. Dihedral Angle.

Gasoline contains hydrocarbons in the rangeA. C-7 to C-12B. C-12 to C-15C. C-4 to C-6D. C-5 to C-8

The homolytic fission of hydrocarbons in the rangeA. Free radicalsB. CarbocationsC. CarbanionsD. Carbenes

The principle constituents of petroleum areA. phenolsB. alcoholsC. hydrocarbonsD. unsaturated hydrocarbons only

What do you mean by cracking?

What are the chief constituents of light oil fraction?

The substance which has been assigned octane number of -45 isA. n-octaneB. n-heptaneC. n-nonaneD. none of these

What type of hydrocarbons are present in high octane gasoline?

Anti knocking character of gasoline can be improved by the addition ofA. lead sulphhateB. lead bromideC. tetraethyl leadD. diethyl cadium

1-Pentyne reacts with:A. SodiumB. sodamideC. Ammonical silver nitrateD. Ammonical cuprous chloride

Which among the following is deactivating group ?A. `-Cl`B. `-OR`C. `-NH_(2)`D. `-NHR`

Which metal is used in wurtz reaction?

The rotation of C – C single bond leads to different isomenc structure called as ………

Which catalyst is used in Friedel’s craft reaction?

Which of the following gieves `CH_(4)` when treated with water ?A. Aluminium carbideB. Calcium carbideC. Silicon carbideD. Iron carbide

Four structures are given in options (a) to (d) . Examine them and select the aromatic structures .A. B. C. D.

Four structures are given in options (i) to (iv). Examine them and select the aromatic structures.

Define Aromatic Compounds.

Four structures are given in options (a) to (d). Examine them and select the aromatic structures(a)(b)(c)(d)

Write IUPAC names of the following compounds :(i) (CH3)3CCH2C(CH3)3(ii) (CH3)2 C(C2H5)2(iii) tetra – tert-butylmethane

n-propyl bromide on treatment with ethanolic potassium hydroxide producesA. propanol-1B. propeneC. propanol-2D. ethyl propyl ether

Write IUPAC names of the following:(i) (CH3)3CCH2C(CH3)(ii) (CH3)2C(C2H5)2(iii) Tetra – tert – butyl methane

How will you demonstrate that double bonds of benzene are somewhat different from that of olefins?

How will you separate propene from propyne?

How will you demonstrate that double bonds of benzene are somewhat different from that of olefins?

What is Grignard reagent?

When acetylene is treated with `HBr` the pruduct isA. `CICH=CHAsCl_(2)`B. `CH_(2)=CHAsCl_(2)`C. `CH_(2)=CAsCl_(3)`D. `AsCl_(3)`

Will the main product in the above reaction show geometrical isomerism?

Which one of these will react with sodium metal-A. EthyneB. EtheneC. EthaneD. Ether

Amongst the given options, the compound in which all the atoms are in one plane in all the possible conformations (if any ), is (are)A. B. C. `H_2C=C=O`D. `H_2C=C=CH_2`

Which of the following compound can be prepared from acetylene by carbonylation ?A. `CH_(3)-COOC_(2)H_(5)`B. `CH_(2)=CH-COOH`C. `CH_(3)CH_(2)-COOH`D. `CH_(3)-CH_(2)-COOCH_(3)`

Acetylene is prepared in the industry by the action of water on …………. (A) calcium carbonate (B) calcium carbide (C) mercuric chloride (D) calcium oxide

From which one of the following both ethylene and acetylene could be prepared in a single step reaction ?A. `CH_3CH_2OH`B. `Br-CH_2-CH_2-Br`C. `CH_3CH_2Br`D. `Br-CH_2-CH_2-OH`

Which of the following is not an endothermic reaction ?A. Combustion of propaneB. Ethane to etheneC. DehydrogenationD. Change of chloring molecule into chlorine atoms.

Pick out the alkane while differs from the other members of the group.A. 2,2-dimethylpropaneB. pentaneC. 3-methylbutaneD. 2,2-dimethylbutane

Benzenesulphonic acid when heated with steam gives benzene but nitrobenzene does not. Why so ?