Assertion : Boron forms only covalent compounds. Reason : Due to sm...

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Assertion : Boron forms only covalent compounds.
Reason : Due to small size of boron, the sum of its first three ionisation enthalpies very high.
(1) If both assertion and reason are true and reason is the correct explanation of assertion.
(2) If both assertion and reason are true but reason is not the correct explanation of assertion.
(3) If Assertion is true but reason is false.
(4) If both assertion and reason are false.
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