AMAZING WORLD OF CARBON COMPOUNDS
Fill in the blanks :
1. The number of valence electrons in carbon are ....................... .
2. The property of direct bonding between atoms of the same element to form
chain is known as ....................... .
3. In saturated hydrocarbons two carbon atoms are linked by ....................... .
4. ....................... is an alkyne.
5. Ethene has ....................... .
6. The molecular mass of two adjacent members in homologous series of
alkane differs by ....................... .
7. ....................... is the first member of alkane family.
8. There are ....................... carbon atoms in butane.
9. ....................... gas is called marsh gas.
10. ....................... is first homolog of alkene series.
11. Vinegar is ....................... .
12. Molecular formula of benzene is ....................... .
13. In the earlier days, the compounds obtained from animal or plant kingdom
were called as ....................... .
14. Atomic number of carbon is ....................... .
15. An organic compound containing only carbon and hydrogen elements is
called ....................... .
*16. General molecular formula of alkane is ....................... .
17. Molecular formula of ethane is ....................... .
18. The general molecular formula of alkene is ....................... .
19. Hydrocarbons in which two carbon atoms are linked by triple bond is called
....................... .
20. The general formula for alkyne is ....................... .
21. Organic compounds with same general molecular formula are known as
....................... .
*22. The organic compounds having double or triple bond in them are termed as
....................... .
*23. ....................... are known as parent organic compound.
*24. Covalent compounds are generally soluble in ....................... solvents.
*25. Triple bond can be obtained by sharing ....................... pairs or .......................electrons.
*26. Hydrocarbons necessarily contain ....................... and ....................... .
27. Methane is also called ....................... .
28. The electronic configuration of carbon is ....................... .
29. Carbon has ....................... electrons in its outermost orbit, hence it is
....................... .
30. Bond formed by sharing of electrons are known as ....................... .
31. All hydrocarbons burn in air to form ....................... and ....................... .
32. Ethanol is called ....................... or ....................... .
33. Ethanol has a formula ....................... .
34. When sodium comes in contact with ethyl alcohol it gives .......................gas.
35. Ethanoic acid is commonly known as ....................... acid.
36. Acetic acid has the formula .......................
37. Below 290k acetic acid solidifies to an ice like mass called .......................
A. Answers.
1. 4
2. Catenation
3. Single bond
4. Ethyne
5. Double bond
6. 14
7. Methane
8. 4
9. Methane
10. Ethene
11. Acetic acid
12. C6H6
13. Organic compound.
14. 6
15. hydrocarbon
16. CnH2n+2
17. C2H4
18. CnH2n
19. Alkyne
20. CnH2n-2
21. Homolog
22. Unsaturated hydrocarbon
23. Hydrocarbon
24. Organic
25. 3,6
26. Hydrogen, carbon
27. Marsh gas
28. 2,4
29. 4, tetravalent
30. Covalent bond
31. CO2, H2O
32. Ethyl alcohol, spirit
33. C2H5OH
34. Hydrogen
35. Acetic acid
36. C2H4O2
37. Galcial acietic acid.
