Write Structural Formula of Methane. - Science and Technology 2


Write structural formula of Methane.



structural formula of Methane:






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2012-2013 (March)


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What are covalent compounds?

Why covalent compounds are different from ionic compounds?

List three characteristic properties of covalent compounds.

Explain why carbon forms compounds mainly by covalent bond.

Write any three features and give two examples of covalent compounds

Fill in the blanks in the following sentence:

In forming oxygen molecule, .............. electrons are shared by each atom of oxygen.

Compare the properties of ionic compounds and covalent compounds.

 Why is diamond used for making cutting tools (like glass cutters) but graphite is not?

 How will you find out which of the water soluble compound A or B is ionic?

Draw the electron-dot structure of  CO2  compound and state the type of bonding.

Explain why, diamond can be used in rock drilling equipment but graphite cannot.

what substance is graphite made?

The solution of one of the following compounds will not conduct electricity. This compounds is:
(a) NaCl
(b) CCl4
(c) MgCl2
(d) CaCl2

One of the following compounds is not ionic in nature. This compound is:
(a) Lithium chloride
(b) Ammonium chloride
(c) Calcium chloride
(d) Carbon tetrachloride

One of the following contains a double bond as well as single bonds. This is:
(a) CO2
(b) O2
(c) C2H4
(d) C2H2

Which of the following has a triple bond as well as single bonds?
(a) ethene
(b) methane
(c) ethyne
(d) nitrogen

The organic compound prepared by Wohler from an inorganic compound called ammonium cyanate was:
(a) glucose
(b) urea
(c) uric acid
(d) vinegar

A saturated hydrocarbon has fifty hydrogen atom in its molecule. The number of carbon atoms in its molecule will be
(a) twenty five
(b) twenty four
(c) twenty six
(d) twenty seven

The number of isomers formed by the hydrocarbon with molecular formula C5H12 is:
(a) 2
(b) 5
(c) 3
(d) 4

Give two example in following case:

Co-ordinate bond compounds

Give two example in following case:
solid covalent compounds

Give two example in following case:
Gaseous non polar compounds

Draw an electron dot structure of the following molecule. (Without showing the circle) :

Explain the following term with example.
Covalent bond

Explain the following term with example.
Hetero atom in a carbon compound

Explain the following term with example.

Explain the following term with example.
Unsaturated hydrocarbon

Explain the following term with example.


Observe the straight chain hydrocarbons given below and answer the following
questions :
i) Which of the straight chain compounds from A and B is saturated and  unsaturated straight chains?
ii) Name these straight chains.
iii) Write their chemical formulae and number of – CH2 - units.

Molecular formula of Propane is C3H8 , write the structural formula of propane.

Choose and write the correct option.

Which type of carbon-carbon bonds are present in Vanaspati ghee?

The carbon compound is used in daily life is ______.

Give examples for the following:
Two gaseous polar compounds.

Explain the following:
Covalent compounds are generally gases or liquids or soft solids.

Explain the bonding in methane molecule using electron dot structure.

Explain why carbon tetrachloride does not dissolve in water.

Draw the electron dot diagram and structure of :

nitrogen molecule

Explain the following : 

Polar covalent compounds conduct electricity ?

Covalent bonds can be single, double or triple covalent bonds. How many electrons are shared in each? Give an example of each type.

Taking MgCl2 as an electrovalent compound, CCl4 as a covalent compound, give four difference between electrovalent and covalent compounds

Potassium chloride is an electrovalent compound, while hydrogen chloride is a covalent compound, But, both conduct electricity in their aqueous solutions. Explain.

Name two compounds that are covalent when taken pure but produce ions when dissolved in water.

Define a covalent bond.

Give an example of the covalent bond formed by

(i) Similar atoms (ii) Dissimilar atoms 

In the formation of electrovalent compounds, electrons are transferred from one element to another. How are electrons involved in the formation of a covalent compound?


Greenish-yellow gas which also bleaches.

What are Allotropes? Name any two allotropic forms of carbon. Give one use of it.

Fill in the blank and rewrite the completed statement:
Covalent compounds are generally soluble in _________ solvents.

Define the functional group and complete the following table. 

S.I. No. Functional Group Compound Formula
(1) ______________ _______________


(2) _______________ _______________ CH3CHO

Name the types of Hydrocarbons.

Name two carbon compounds used in day-to-day life.

Number of valence electrons in a carbon atom is _______.

Write the molecular formula of the given compound.


Write an Explanation.


Write an Explanation.


Write scientific reason.

Carbon has the property of forming many compounds.

Complete the following activity.

Write the names of the hydrocarbons for the following structural formula.

(isobutylene, cyclohexane, propene, cyclohexene, cyclopentane, benzene, propyne, isobutane, propane)

\ce{H - C ≡ C - C - H}\\

Complete the following activity.

Write the names of the hydrocarbons for the following structural formula.

(isobutylene, cyclohexane, propene, cyclohexene, cyclopentane, benzene, propyne, isobutane, propane)


Considering MgCl2 as ionic compound and CH4 as covalent compound give any two differences between these two compounds.

Give an example for each of the following statement

A compound in which two Covalent bonds are formed. 

Give an example for each of the following statement.

Formation of coordinate covalent bond between NH3 ➝ BF3 molecules

Give an example for each of the following statement.

A compound in which three covalent bonds are formed.

Identify the incorrect statement and correct them.

  1. Like covalent compounds, coordinate compounds also contain charged particles (ions). So they are good conductors of electricity. 
  2. Ionic bond is a weak bond when compared to Hydrogen bond.
  3. Ionic or electrovalent bonds are formed by mutual sharing of electrons between atoms. 
  4. Loss of electrons is called Oxidation and gain of electron is called Reduction.
  5. The electrons which are not involved in bonding are called valence electrons.

Discuss in brief about the properties of coordinate covalent compounds.

The number of pi-bonds present in benzoic acid molecule are ______.

Consider the coordination compound, K2[Cu(CN)4]. A coordinate covalent bond exists between:

When ethyl alcohol and acetic acid are mixed, the resulting ester has a chemical formula ______.

`"CH"_3 - "CH"_2 - "OH" overset("Alkaline""KMnO"_4 + "Heat")(->) "CH"_3 - "COOH"`

In the above given reaction, alkaline KMnO4 acts as 

Which of the following compound(s) possesses a high melting point?

In covalent bond formation, the sharing of ______ electrons takes place in their outermost shell.

Molecular reactions are ______ in the covalent compound.

Statement (A): Covalent compounds are bad conductors of electricity.
Reason (B): Covalent compounds contain charged particles (ions)

Assertion (A): Melting point and boiling point of ethanol are lower than that of sodium chloride.

Reason (R): The forces of attraction between the molecules of ionic compounds are very strong. 


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