1. What are hydrocarbons? Give examples.
2. How does carbon attain noble gas configuration?
3. Why are covalent compounds generally poor
conductors of electricity?
4. Why homologous series of carbon compounds
are called so? Write chemical formula of two
consecutive members of a homologous series and
state the part of these compounds that determine
their-
i) physical properties and ii) chemical properties
5. Write three characteristics of the compounds of
a homologous series.
6. Why carbon is unique in nature?
7. C3H6 , C4H8 , C5H10 belong to same
homologous series.
i) Arrange the hydrocarbons in order of increasing
boiling points.
ii) Why melting point and boiling point of C5H10
are higher than C4H8
iii) Write the names of the given compounds.
8. Explain the two properties of carbon which lead
to the large number of carbon compounds. we see
around us?
Answers
Answer:
found in petrol or coal or in natural gas
1) A hydrocarbon is a molecule whose structure includes only hydrogen and carbon atoms. ... Examples of Hydrocarbons: 1. Natural gas and fuels - Many of the natural fuel sources we use are hydrocarbons. Compounds like methane, butane, propane, and hexane are all hydrocarbons.
2)Carbon has four electron in its valence shell orbital. So, it can neither accept nor gain four electron. ... So, carbon forms covalent bond to complete its octet.
3)Covalent Compounds Are Poor Conductors
Ionic compounds are great conductors of electricity when dissolved or melted. ... Electricity is not able to conduct efficiently through covalent compounds because there are no ions to move the electrical charge.
5)Characteristics are :
The members of the homologous series have same functional group.
Members have the same general formula.
Members have the almost same chemical properties due to same functional group.
Members have common general method of preparation.
6)What makes carbon unique is its ability in forming covalent bonds which are very strong in nature. The small size of the carbon atom makes the compounds of Carbon exceptionally stable. Hence carbon as an element has the ability to form a variety of stable compounds, which can exist freely in nature.
8)The two features of carbon that give rise to a large number of compounds are as follows: (i) Catenation: It is the ability to form bonds with other atoms of carbon. (ii) Tetravalency: With the valency of four, carbon is capable of bonding with four other atoms.