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Assertion. Elementary phosphorus exists in three principal allotropic forms, i.e., white (yellow), red (or violet) and black. Reason. Of the three forms, white phosphorus is the most important and most reactive.

Answer»

If both assertion and reason are true, and reason is the correct explanation of the assertion.
If both assertion and reason are ture, but reason is not the correct EXPLANANTION of the assertion.
If assertion is true, but reason is false.
If both assertion and reason are false

Solution :Correct explanation. Depending UPON whether `P_(4)` molecules EXIST as discrete molecules h eld together by weak van der waals forces or are covalently bonded with one another to form polymeric structures, phosphorus exists in three allotropic FORMS.


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