Question

03 Explain the covalent bond in triple bonded compounds
04 Describe the main features of Homologous series.
05 Draw the Bondline structures of Methanol and 2-Butene
06 Explain : "Drinking alcohol is injurious to health".
07 Why Oxyacetylene flame is used for Welding purposes
08 What is displacement reaction? Explain.
09 What is combustion? Explain with example.
10 Write the structural formulas of Isomers of pentane.
Chap - 5 Periodic Classification of Elements
01 Write detail note on Dobereiner's classification of elements
02 Answer the following
a) name the element having atomic number 18.
b) To which period does this element is belong.
c) Write the electronic confirguation of this element.
03 Write the limitations of Mendeleevs periodic table.
04 Phosphorus has atomic number 15 and is sorrounded by elements
having atomic number 7, 14, 16 and 33. Among these elements
which one would have physical and chemical properties simlilar
to phosphorus? Why?
05 How does the modern periodic table remove the anomalies of
Mendeleev's periodic table.
06 Explain the trends of metallic property in a group.
07 What is valency? Explain the trends in valency in a period and
in a group
08 How are modern periodic table and Mendeleev's periodic table
different from each other.
09 Write short note on modern periodic table.
10 In morden periodic table two elements X and Y belonging to
second period are in second and seventeenth group respectively,
then write about the following properties of X and Y.
a) Atomic radius b) Metalic property c) valency
Chap - 7 Control and Coordination
01 Draw the diagram of neuron and explain its structure
function​

Answer 1

Answer:

) The two features of carbon which lead to form huge number of compounds are:

1) Catenation - It is the linkage of atoms of the same element into longer chains. Catenation occurs most readily in carbon, which forms covalent bonds with other carbon atoms to form longer chains and structures. This is the reason for the presence of the vast number of organic compounds in nature.

2) Tetravalency -A tetravalence is the state of an atom with four electrons available for covalent chemical bonding in its valence (outermost electron shell).

Organic compounds have covalent bonds in their structure.

b) C3H8{ C }_{ 3 }{ H }_{ 8 }C3​H8​ and C4H10{ C }_{ 4 }{ H }_{ 10 }C4​H10​ which are propane and butane respectively are two higher homologues of ethane.

(c) Electron dot structure as shown in image.

solution

Explanation: