Question

which of the following molecule does not obey octet rule and also has lone pair on central atom. 1) CCL4. 2) PCL3. 3)NH3. 4)SCL4

Answer 1

NH3   does not obey octet rule and also has lone pair on central atom.

Answer 2

Concept

The valence electrons are the electrons which are in the outer most shell associated with an atom.

Explanation

As per the given options ,

Sulfur has the six valence electrons and clorine hai seven valence electrons

So, The total number number of electrons should be of electrons in noble gas configuration to follow the octet rule.

Therefore Valence electrons in sulphur + valence electrons in clorine*4

= 6 + (4*7)

= 6 + 28

= 34

But noble gases near to this has 36 electrons

Hence SCL4 does not follow octet rule

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