Given below are two statements :
Statement I : The halogen that makes longest bond with hydrogen in HX, has the smallest covalent radius in its group.
Statement II : A group 15 element’s hydride has the lowest boiling point among corresponding hydrides of other group 15 elements. The maximum covalency of that element E is 4.
In the light of the above statements, choose the correct answer from the options given below.
- A
Both Statement I and Statement II are true.
- B
Statement I is false but Statement II is true.
- C
Both Statement I and Statement II are false.
- D
Statement I is true but Statement II is false.
Statement I — bond-length order is . The longest H–X bond is to iodine, which has the largest covalent radius in the group, not the smallest. Statement I is false.
Statement II — among group-15 hydrides, the boiling-point order is ( is anomalously high because of H-bonding). So the lowest BP belongs to , and the element is phosphorus. Phosphorus shows a maximum covalency of 6 (it uses 3d orbitals, e.g. in , expanded octet), not 4. Statement II is false.
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