Hydrocarbons Chemistry NEET Questions 2024

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Hydrocarbons Chemistry NEET Practice Questions

1 / 40

In commercial gasoline, the type of hydrocarbons which are more desirable is

(b) toluene

(d) straight-chain hydrocarbon

(a) linear unsaturated hydrocarbon

2 / 40

Consider the nitration of benzene using mixed conc. H₂SO₄ and HNO₃. If a large amount of KHSO₄ is added to the mixture, the rate of nitration will be

(d) slower

(a) unchanged

(b) doubled

3 / 40

Which reagent converts propene to 1-propanol?

(d) Aq. KOH

(b) B₂H₆, H₂O₂, OH^–

(a) H₂O, H₂SO₄

4 / 40

Which is the maximum stable?

(b) cis-2-Butene

(d) All have the same stability

(a) 1-Butene

5 / 40

Reduction of 2-butyne with sodium in liquid ammonia gives predominantly

(a) cis-2-butene

(b) no reaction

(d) n-butane

6 / 40

Geometrical isomers differ in

(d) length of the carbon chain.

(b) position of atoms

(a) position of functional group

7 / 40

The alkane that gives only one monochloride product on chlorination with Cl₂ in presence of diffused sunlight is

(a) 2,2-dimethylbutane

(b) neopentane

(d) isopentane

8 / 40

With respect to the conformers of ethane, which of the following statements is true?

(a) Bond angle changes but bond length remains the same

(d) Bond angle remains the same but bond length changes

(b) Both bond angle and bond length change.

9 / 40

The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is

(a) the eclipsed conformation of ethane is more stable than staggered conformation even though the eclipsed conformation has the torsional strain

(d) the eclipsed conformation of ethane is more stable than staggered conformation because eclipsed conformation has no torsional strain.

(c) the staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has a torsional strain

(b) the staggered conformation of ethane is more stable than eclipsed conformation, because staggered conformation has no torsional strain

10 / 40

The most stable conformation of n-butane is

(d) eclipsed

(a) gauche

(b) staggered

11 / 40

2-Bromopentane is heated with potassium ethoxide in ethanol. The major product obtained is

(b) 1-pentene

(a) trans-2-pentene

(d) 2-cis-pentene

12 / 40

The cylindrical shape of an alkyne is due to

(d) three p C – C bonds

(b) one sigma C – C and two p C – C bonds

(a) two sigmas C – C and one p C – C bonds

13 / 40

In Friedel-Crafts reaction, toluene can be prepared by

(b) C₆H₅Cl + CH₄

(a) C₆H₆ + CH₃Cl

(d) C₆H₆ + CH₃COCl

14 / 40

Which of the following has zero dipole moment?

(a) 1-Butene

(b) 2-Methyl-1-propene

(d) trans-2-Butene

15 / 40

Which of the following organic compounds has the same hybridization as its combustion product (CO₂)?

(b) Ethyne

(d) Ethanol

(a) Ethane

16 / 40

Liquid hydrocarbons can be converted into a mixture of gaseous hydrocarbons by

(b) cracking

(a) oxidation

(d) hydrolysis

17 / 40

The oxidation of benzene by V₂O₅ in the presence of air produces

(b) benzoic acid

(a) maleic anhydride

(d) benzoic anhydride

18 / 40

Benzene reacts with CH₃Cl in the presence of anhydrous AlCl₃ to form

(b) benzyl chloride

(d) toluene

(a) chlorobenzene

19 / 40

Nitrobenzene can be prepared from benzene by using a mixture of conc. HNO₃ and conc. H₂SO₄. In the mixture, nitric acid acts as an

(b) base

(d) reducing agent

(a) acid

20 / 40

The restricted rotation of carbon double bond in 2-butene is due to

(d) sideways overlap of two p-orbitals

(a) overlap of one s and sp²-hybridized orbitals

(b) overlap of two sp²-hybridized orbitals

21 / 40

Dihedral angle in the staggered form of ethane is

(a) 0°

(d) 180°

(b) 120°

22 / 40

Which of the following can be used as the halide component for Friedel–Crafts reaction?

(a) Chlorobenzene

(d) Isopropyl chloride

(b) Bromobenzene

23 / 40

Reactivity of hydrogen atoms attached to different carbon atoms in alkanes has the order

(d) tertiary > secondary > primary

(a) tertiary > primary > secondary

(b) primary > secondary > tertiary

24 / 40

2-Butene shows geometrical isomerism due to

(d) chiral carbon.

(a) restricted rotation about the double bond

(b) free rotation about the double bond

25 / 40

In preparation of alkene from alcohol using Al₂O₃ which is the effective factor?

(b) Temperature

(d) Surface area of Al₂O₃

(a) Porosity of Al₂O₃

26 / 40

One of the following which does not observe the anti-Markownikoff’s addition of HBr, is

(a) pent-2-ene

(b) propene

(d) but-1-ene

27 / 40

Reaction of HBr with propene in the presence of peroxide gives

(b) 3-bromopropane

(a) isopropyl bromide

(d) n-propyl bromide.

28 / 40

A compound is treated with NaNH₂ to give sodium salt. Identify the compound.

(d) C₂H₄

(a) C₂H₂

(b) C₆H₆

29 / 40

Which of the compound with molecular formula C5H10 yields acetone on ozonolysis?

(d) 2-Methyl-2-butene

(a) 3-Methyl-1-butene

(b) Cyclopentane

30 / 40

Which of the following reagents will be able to distinguish between 1-butyne and 2-butyne?

(d) Br₂

(a) NaNH₂

(b) HCl

31 / 40

The shortest C–C bond distance is found in

(d) acetylene

(b) ethane

(a) alcohol

32 / 40

Acetylenic hydrogens are acidic because

(d) acetylene belongs to the class of alkynes with the molecular formula, CnH_2n–2

(b) acetylene has only open hydrogen in each carbon

(a) sigma electron density of the C – H bond in acetylene is nearer to carbon, which has 50% s-character

33 / 40

Among the following compounds the one that is most reactive toward electrophilic nitration is

(b) nitrobenzene

(a) benzoic acid

(d) benzene

34 / 40

Which of the following compounds will not undergo Friedel-Crafts reaction easily?

(d) Xylene

(b) Toluene

(a) Nitrobenzene

35 / 40

The compound that will react most readily with gaseous bromine has the formula

(b) C₂H₂

(d) C₂H₄

(a) C₃H₆

36 / 40

When acetylene is passed through dil. H₂SO₄ in the presence of HgSO₄, the compound formed is

37 / 40

Which one of these is not compatible with arenes?

(d) Resonance

(b) Delocalization of p-electrons

(a) Electrophilic additions

38 / 40

Which of the following alkane cannot be made in good yield by the Wurtz reaction?

(b) 2, 3-Dimethylbutane

(a) n-Hexane

(d) n-Butane

39 / 40

In Friedel-Crafts alkylation, besides AlCl₃ the other reactants are

(b) C₆H₆ + CH₄

(d) C₆H₆ + CH₃COCl

(a) C₆H₆ + CH₃Cl

40 / 40

Which of the following is used as an anti-knocking material?

(d) Ethyl alcohol

(a) Glyoxal

(b) Freon

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Hydrocarbon Chemistry NEET Questions

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