Carbon and its Compounds Questions

 📝 Carbon and its Compounds

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Multiple Choice Questions 

1. Carbon exists in the atmosphere in the form of

(a) carbon monoxide only

(b) carbon monoxide in traces and carbon dioxide

(c) carbon dioxide only

(d) coal

Ans: (b)

 2. Which of the following statements are usually correct for carbon compounds? These

(i) are good conductors of electricity

(ii) are poor conductors of electricity

(iii) have strong forces of attraction between their molecules

(iv) do not have strong forces of attraction between their molecules

(a) (i) and (iii) 

(b) (ii) and (iii)

(c) (i) and (iv)

(d) (ii) and (iv)

Ans: (d)

3. Which of the following is the correct representation of the electron dot structure of nitrogen?

Ans: (d)

4. The correct electron dot structure of a water molecule is

Ans: (c)

5. Which of the following are correct structural isomers of butane?

(a) (i) and (iii) 

(b) (ii) and (iv)

(c) (i) and (ii) 

(d) (iii) and (iv)

Ans: (c)

6. Structural formula of ethyne is

Ans: (a)

7. A molecule of ammonia (`NH_3`) has

(a) only single bonds

(b) only double bonds

(c) only triple bonds

(d) two double bonds and one single bond

Ans: (a)

8. Identify the unsaturated compounds from the following

(i) Propane

(ii) Propene

(iii) Propyne

(iv) Chloropropane

(a) (i) and (ii)

(b) (ii) and (iv)

(c) (iii) and (iv) 

(d) (ii) and (iii)

Ans: (d)

9. Pentane has the molecular formula `C_5 H_12`. It has

(a) 5 covalent bonds

(b) 12 covalent bonds

(c) 16 covalent bonds

(d) 17 covalent bonds

Ans: (c)

10. Which of the following is not a straight-chain hydrocarbon?

Ans: (d)

11. In which of the following compounds, — OH is the functional group?

(a) Butanone

(b) Butanol

(c) Butanoic acid

(d) Butanal

12. The correct structural formula of butanoic acid is

13. The name of the compound `CH_3 — CH_2 — CHO` is

(a) Propanal

(b) Propanone

(c) Ethanol

(d) Ethanal

14. The heteroatoms present in `CH_3 — CH_2 — O — CH_2— CH_2 Cl`  are

(i) oxygen

(ii) carbon

(iii) hydrogen

(iv) chlorine

(a) (i) and (ii) 

(b) (ii) and (iii)

(c) (iii) and (iv) 

(d) (i) and (iv)

15. The first member of alkyne homologous series is

(a) ethyne

(b) ethene

(c) propyne

(d) methane

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Q. In the electron dot structure, the valence shell electrons are represented by crosses or dots.

(a) The atomic number of chlorine is 17. Write its electronic configuration

(b) Draw the electron dot structure of the chlorine molecule.

Q. How many structural isomers can you draw for pentane?

Q. What will be the formula and electron dot structure of cyclopentane?

Q. Write the structural formulae of all the isomers of hexane. Also, name them. 

Ans:

a)

IUPAC Name: Hexane
Common Name: n-Hexane 

b)

IUPAC Name: 2-methylpentane
Common Name: iso-hexane

c) 

IUPAC Name: 2,2-dimethylbutane 
Common Name: neo-hexane

d) 

IUPAC Name: 2,3-dimethylbutane 

e) 

IUPAC Name: 3-methylpentane 

Q. Draw the structures for the following compounds.

(i) Ethanoic acid 

(ii) Bromopentane

(iii) Butanone 

(iv) Hexanal.

Are structural isomers possible for bromopentane?

Q. How would you name the following compounds?

Q. Write the names of the following compounds

Q. Identify and name the functional groups present in the following compounds.

Q. Name the functional groups present in the following compounds

Q. An organic compound `A` on heating with concentrated `H_2SO_4`  forms a compound `B` which on addition of one mole of hydrogen in presence of `Ni` forms a compound `C`. One mole of compound `C` on combustion forms two moles of `CO_2`  and 3 moles of `H_2O`. Identify the compounds `A`, `B` and `C` and write the chemical equations of the reactions involved.

Q. Look at Figure and answer the following questions

 (a) What change would you observe in the calcium hydroxide solution taken in tube B? 

(b) Write the reaction involved in test tubes A and B respectively. 

(c) If ethanol is given instead of ethanoic acid, would you expect the same change? 

(d) How can a solution of lime water be prepared in the laboratory?

Q. How would you bring about the following conversions? Name the process and write the reaction involved. 

(a) ethanol to ethene. 

(b) propanol to propanoic acid. Write the reactions.

Q. A salt X is formed and a gas is evolved when ethanoic acid reacts with sodium hydrogencarbonate. Name the salt X and the gas evolved. Describe an activity and draw the diagram of the apparatus to prove that the evolved gas is the one which you have named. Also, write chemical equation of the reaction involved.