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Group 13 of periodic table consists of b...

Group 13 of periodic table consists of boron or aluminium family. Boron being the first member, shows anomalous behaviour due to its small size and high nuclear charge/size ratiom high electrone gastivity and non availability of d-electrons. All the group 13 members forms hydrides, hydroxides, halides showing +3 covalency, however boron forms electron deficient species.
Which of the following statement(s) is/are correct.
(I) Both B and Al forms anionic hydrides
(II) Both form alkaline hydroxide of formula `M(OH)_(3)`
(III) Both B and Al forms a series of polymeric hydrides
(IV) Both forms monoeric halides `MX_(3)`

A

I, IV

B

I, II,III

C

II,III

D

I,II,IV

Text Solution

Verified by Experts

The correct Answer is:
A
`NaBH_(4) and LiAlH_(4)` are ionic hydrides. Al does not form a series of polymeric hydride. Only one hydride of Al is `(AIH_(3))_n` is known. `B(OH)_3` is acid. `AlX_3` , exists as dimer
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