Class 11 Hydrocarbon MCQs with Answer

NCERT MCQ Questions for Class 11 Chemistry Chapter with Answers PDF free download. MCQ Questions for Class 11 Chemistry with Answers were prepared based on the latest exam pattern. Class 11 chemistry MCQs with answers are provided here for Hydrocarbons. These MCQs are based on the CBSE board curriculum and correspond to the most recent Class 11 chemistry syllabus. 

Class 11 chemistry chapter Hydrocarbon MCQs with Answer

Q1. Homolyte fission leads to formation of:

1. Nucleophile.
2. Carbanion.
3. Free radical.
4. Arbocation.

Q3. The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are
generally insoluble in water at room temperature but are miscible with water vapour in vapour phase. A suitable method for
the extraction of these oils from the flowers is:

1. Distillation.
2. Crystallisation.
3. Distillation under reduced pressure.
4. Steam distillation.

Q4. Which type of bond is formed between carbon atom and nitrogen atom?

1. Covalent bond.
2. Ionic bond.
3. Dative bond.
4. None of these

Q5. The IUPAC name of iso-octane is:

1. 2, 2-dimethylpentane.
2. 2, 3-dimethylpentane.
3. 2, 3, 3-trimethylpentane.
4. 2, 2, 4-trimethylpentane

Q6. What is the name of tube in which a known mass of an organic compound is heated for the quantitative analysis of sulphur?

1. Borosil tube.
2. Carius tube.
3. Kjeldahl tube.
4. None of these.

Q7. Which of the following compounds will exhibit geometrical isomerism?

1. 1-phenyl-2-butene.
2. 3-phenyl-1-butene.
3. 2-phenyl-1-butene.
4. 1, 1-diphenyl-1-propane.

Q8. Which of the following method is used to purify liquids having very high boiling points and those which decompose at or
below their boiling points?

1. Simple distillation.
2. Fractional distillation.
3. Distillation under reduced pressure.
4. None of the above.

Q9.

Q10.

Q11. In which of the following ways the structure(s) of organic compounds is/ are represented?

1. Lewis or dot structure.
2. Dash structure.
3. Condensed and bond-line structure.
4. All of the above.

Q12. Look at the figure below and find the hybridisation of carbon atom.
Image

1. sp³
2. sp²
3. sp
4. None of these.

Q13. The technique in which extraction of compound takes place on the basis of more solubility of one compound in another
solvent, is:

1. Differential extraction.
2. Chromatography.
3. Sublimation.
4. Crystallisation.

Q14. For the purification, isolation and separation of organic compounds, the latest technique is:

1. Chromatography.
2. Steam distillation.
3. Fractional crystallization.
4. Sublimation.

Q15. Which techniques is based on the difference in the solubilities of the compound and the impurities in a suitable solvent?

1. Sublimation.
2. Crystallisation.
3. Distillation.
4. None of these.

Q16. Which of the following best describe the given statement “an atom or group of atoms joined in a specific manner which is
responsible for the characteristic chemical properties of the organic compounds?

1. Heteroatom.
2. Functional group.
3. Aromatic group.
4. Non-aromatic group.

Q17. In paper chromatography, chromatography paper contains water trapped in it, which acts as the:

1. Mobile phase.
2. Stationary phase.
3. Stationary medium.
4. None of these.

Q18.In Duma’s method for estimation of nitrogen, 0.3g of an organic compound gave 50 mL of nitrogen collected at 300K
temperature and 715 mm pressure. The percentage composition of nitrogen in the compound (Aqueous tension at 300K =
15mm) is:

1. 15.46%
2. 17.46%
3. 18.36%
4. 28%

Q19. Glycerol is purified by:

1. Vacuum distillation.
2. Simple distillation.
3. Steam distillation.
4. Fractional distillation.

Q20

Q21. The elements always present in organic compounds are C and H. In addition to these, name the other elements that may be
present in it:

1. Oxygen and nitrogen.
2. Sulphur and halogens.
3. Phosphorus.
4. All of these.

Q22. During the fusion of an organic compound with sodium metal, nitrogen of the organic compound is converted into:

1. NaNO₂
2. NaNH₂
3. NaCN
4. NaNC

Q23. Acidified sodium fusion extract on addition of ferric chloride solution gives blood red colouration. This confirms the presence
of which of the following element(s)?

1. Both S and cl.
2. Both N and S.
3. Only N.
4. Only S

Q24. Which of the following is the correct IUPAC name?

1. 3-Ethyl-4, 4-dimethylheptane.
2. 4, 4-Dimethyl-3-ethylheptane.
3. 5-Ethyl-4, 4-dimethylheptane.
4. 4, 4-Bis (methyl)-3-ethylheptane.

Q25. During hearing of a court case, the judge suspected that some changes in the documents had been carried out. He asked the
forensic department to check the ink used at two different places. According to you which technique can give the best
results?

1. Column chromatography.
2. Solvent extraction.
3. Distillation.
4. Thin layer chromatography.

Q26. In the Kjeldahl’s method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75g of sample
neutralised 10mL of 1M H₂SO. The percentage of nitrogen in the soil is:

1. 37.33
2. 45.33
3. 35.33
4. 45.33

Q27. Nucleophile is a species that should have:

1. A pair of electrons to donate.
2. Positive charge.
3. Negative charge.
4. Electron deficient species.

Q28. In Carius method of estimation of halogens, 250mg of an organic compound gave 141mg of AgBr. The percentage of bromine
in the compound is (atomic mass Ag = 108 and Br = 80)

1. 24
2. 36
3. 48
4. 60

Q29. What is the technological applications of fractional distillation?

1. To separate different fractions of crude oil in petroleum industry.
2. To separate different fractions of volatile and non-volatile solvents.
3. To separate mixture of amino acids.
4. No technological application of fractional distillation.

Q30. Glycerol can be separated from spent-lye in soap industry by:

1. Chromatography.
2. Sublimation.
3. Fractional distillation.
4. Distillaltion under reduced pressure.