Chemistry Class-11: Chapter –4. Chemical Bonding and Molecular Structure Part-6

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I. Multiple Choice Questions (Type-I)

Question: 37

In both water and dimethyl ether , oxygen atom is central atom, and has the same hybridisation, yet they have different bond angles. Which one has greater bond angle? Give reason.

Answer:

[Hint: Dimethyl ether will have larger bond angle. There will be more repulsion between bond pairs of groups attached in ether than between bond pairs of hydrogen atoms attached to oxygen in water. The carbon of in ether is attached to three hydrogen atoms through bonds and electron pairs of these bonds add to the electronic charge density on carbon atom. Hence, repulsion between two groups will be more than that between two hydrogen atoms.]

Question: 38

Write Lewis structure of the following compounds and show formal charge on each atom.

Answer:

Question: 39

The energy of molecular orbital is greater than and molecular orbitals in nitrogen molecule. Write the complete sequence of energy levels in the increasing order of energy in the molecule. Compare the relative stability and the magnetic behavior of the following species:

Question: 40

What is the effect of the following processes on the bond order in ?

(i)

(ii)

Answer:

Question: 41

Give reasons for the following :

(i) Covalent bonds are directional bonds while ionic bonds are nondirectional.

(ii) Water molecule has bent structure whereas carbon dioxide molecule is linear.

(iii) Ethyne molecule is linear.

Answer:

Question: 42

What is an ionic bond? With two suitable examples explain the difference between an ionic and a covalent bond?

Answer:

Question: 43

Arrange the following bonds in order of increasing ionic character giving reason

Answer:

Question: 44

Explain why cannot be represented by a single Lewis structure. How can it be best represented?

Answer:

Question: 45

Predict the hybridisation of each carbon in the molecule of organic compound given below. Also indicate the total number of sigma and bonds in this molecule.

Answer:

Question: 46

Group the following as linear and non-linear molecules:

Answer:

Question: 47

Elements X, Y and Z have 4, 5 and 7 valence electrons respectively. (i) Write the molecular formula of the compounds formed by these elements individually with hydrogen. (ii) Which of these compounds will have the highest dipole moment?

Answer:

Question: 48

Draw the resonating structure of

(i) Ozone molecule

(ii) Nitrate ion

Answer: