Question

9. What is the difference between the hydride compounds of group 14 and 15 elements on the basis of lewis structure?​

Answer 1

Answer:

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

B is group 13 element. It forms hydride B

2

H

6

which is electron deficeint. The central B atom has 6 valence electrons and can accept 2 electrons ( a lone pair, from a base) to complete its octet. Hence, boron forms hydride which is Lewis acid. N is group 15 element. It forms hydride NH

3

which is electron rich. The central N atom has a lone pair of electrons that can be donated to a suitable Lewis acid. Hence, nitrogen forms hydride which is Lewis base.

Note: Lewis acid is electron pair acceptor and Lewis base is electron pair donor.

Answer 2

Answer:

The hydride compounds of group 15 elements have a lone pair of electrons while the hydride compounds of group 14 elements do not have any electron lone pairs.

Explanation:

• Group 14 elements have 4 valence electrons and need 4 more electrons to fulfil their octet
• Group 15 elements have 5 valence electrons and need 3 more electrons to fulfil their octet
• An example of a hydride compound in group 14 is CH₄ and that in group 15 is NH₃
• In NH₃ there are 3 N-H bonds and one lone pair of electrons, there are a total of 8 electrons in the valence shell

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