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प्रश्न
Fill in the blank in the following sentence:
The number of single covalent bonds in C2H2 molecule are ...........
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उत्तर
The number of single covalent bonds in a C2H2 molecule is two.
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संबंधित प्रश्न
Explain why carbon forms compounds mainly by covalent bond.
Give one example of a molecule containing a triple covalent bond.
Explain why covalent compounds have generally high melting points?
Why is graphite a good conductor of electricity but diamond is a non-conductor of electricity?
The atomic numbers of four elements P, Q, R and S are 6, 10, 12 and 17 respectively. Which two elements can combine to form a covalent compound?
(a) P and R
(b) Q and S
(c) P and S
(d) R and S
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
Which of the following has a triple bond as well as single bonds?
(a) ethene
(b) methane
(c) ethyne
(d) nitrogen
Draw all possile structural formulae of compound from their molecular formula given below.
C3H4
Explain the following briefly:
Sodium chloride dissolves in water but carbon tetra chloride is insoluble in water.
Explain the bonding in methane molecule using electron dot structure.
Give an example of the covalent bond formed by
(i) Similar atoms (ii) Dissimilar atoms
Answer the following question.
What is methane? Draw its electron dot structure. Name the type of bonds formed in this compound. Why are such compounds:
(i) poor conductors of electricity? and
(ii) have low melting and boiling points? What happens when this compound burns in oxygen?
Generally, the melting and boiling point of carbon compounds are found to be less than _______ °C.
Write the molecular formula of the given compound.
Propylene
Complete the following activity.
Write the names of the hydrocarbons for the following structural formula.
(isobutylene, cyclohexane, propene, cyclohexene, cyclopentane, benzene, propyne, isobutane, propane)
| \[\begin{array}{cc}\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H}\\ |\phantom{....}|\phantom{....}|\\\ce{H - C - C - C - H}\\ |\phantom{....}|\phantom{....}|\\\ce{H}\phantom{...}\ce{H}\phantom{...}\ce{H} \end{array}\] |
Which of the following statements are usually correct for carbon compounds? These
- are good conductors of electricity
- are poor conductors of electricity
- have strong forces of attraction between their molecules
- do not have strong forces of attraction between their molecules.
Cation is formed when ______.
The table shows the electronic structures of four elements.
| Element | Electronic Structure |
| P | 2, 6 |
| Q | 2, 8, 1 |
| R | 2, 8, 7 |
| S | 2, 8, 8 |
- Identify which element(s) will form covalent bonds with carbon.
- “Carbon reacts with an element in the above table to form several compounds.” Give suitable reason.
In covalent bond formation, the sharing of ______ electrons takes place in their outermost shell.
