Chemistry Class-11: Chapter –4. Chemical Bonding and Molecular Structure Part-5

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III. Short Answer Type

Question: 31

Explain the non linear shape of and non planar shape of using valence shell electron pair repulsion theory.

Answer:

Question: 32

Using molecular orbital theory, compare the bond energy and magnetic character of and species.

Answer:

According to molecular orbital theory electronic configurations of and species are as follows:

Bond order of

Bond order of

Higher bond order of shows that it is more stable than . Both the species have unpaired electrons. So both are paramagnetic in nature.

Question: 33

Explain the shape of .

Answer:

Question: 34

Structures of molecules of two compounds are given below:

Structure of two compounds

Structure of Two Compounds

Structure of two compounds

(a) Which of the two compounds will have intermolecular hydrogen bonding and which compound is expected to show intermolecular hydrogen bonding.

(b) The melting point of a compound depends on, among other things, the extent of hydrogen bonding. On this basis explain which of the above two compounds will show higher melting point.

(c) Solubility of compounds in water depends on power to form hydrogen bonds with water. Which of the above compounds will form hydrogen bond with water easily and be more soluble in it.

Answer:

(a) Compound (I) will form intermolecular hydrogen bond because and group are close together in comparison to that in compound (II).

Intermolecular hydrogen bond

Intermolecular Hydrogen Bond

Intermolecular hydrogen bond

(b) Compound (II) will have higher melting point because it forms intermolecular hydrogen bonds. Thus, more and more molecules are joined together through hydrogen bond formation.

(c) Due to intermolecular hydrogen bonding compound (I) will not be able to form hydrogen bonds with water thus will be less soluble in it while compound (II) can form hydrogen bond with water more easily and will be soluble in water.

Question: 35

Why does type of overlap given in the following figure not result in bond formation?

Bond overlap

Bond Overlap

Bond overlap

Answer:

Question: 36

Explain why is trigonal bipyramidal whereas is square pyramidal.

Answer: