Page 2 - HA

iii). Lewis structures of Common covalent compounds.
10. Draw the Dot Structures of the following molecules - . H 2, O 2, N 2, Cl 2, Br 2, F 2,
S 8, HBr, H 2S, CCl 4, PH 3.
B] Versatile nature of carbon.

i)Catenation & Tetravalency
1. What do you understand by the term Catenation?

2. What do you mean by Tetravalency?

3. Identify the characteristic features of the element Carbon, which is
responsible for the existence of a very large no. of Carbon compounds.

4. Due to tetravalency, carbon atoms can form bond with 4 different atoms at a
time. What are the different types of structures possible in case of carbon
compounds.
ii).Examples of elements exhibiting catenation
5. A single C- atom can bond with how many C-atoms at a time?

6. Two carbon atoms cannot get bonded to each other by sharing 4 electrons
each and forming 4 bonds between the two participating atoms. Justify your
answer.

7. Name an element which exhibits catenation the most.

8. Name two elements other than carbon, which exhibit catenation.

9. Name an element, which exhibits Catenation the most, next to Carbon.

10. Why does Carbon exhibit catenation the most?
Ans. Due to its very small atomic radius, the C-C bonds are very strong.
This makes the carbon chains very strong. So a large variety of carbon
compounds exist in nature.
11. Compare Catenation exhibited in Carbon & Silicon.

C] Difference between saturated hydrocarbons and unsaturated hydrocarbons.

i). Hydrocarbons- Definition & Types of Hydrocarbons.
1. What are Hydrocarbons?

2. Give one important difference between the two types of Hydrocarbons.

3. Which of the following are saturated/unsaturated- C 6H 12, C3H 6, CH 4,
C 4H 10,C 2H 4, C 5H 10.

2