Question

Which of the following is not a characteristic of boranes?



1) They undergo spontaneous combustion in air.


2) Their combustion products are water and crystalline boron.


3) They form borohydride complexes by reaction with alkali metal hydrides.


4) They readily get hydrolysed by liberating H₂ gas​

Answer 1

Explanation:

Answer is 4

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Answer 2

Properties of Boranes

Explanation:

• Boron having strong affinity with $O_{2}$ , it get spontaneously combustion in air

        $B_{2} H_{6} + 3O_{2}$  →  $B_{2} O_{3} + 3H_{2} O$

• Boranes can form borohydride complex by reacting with alkali metal

• Lower boranes get hydrolysed very easily by releasing $H_{2}$ gas While hiher boranes get difficulty in hydrolyse
• All boranes react with ammonia and give different product depend upon the borane
• Boranes also react with halogen and give different product
• Boranes can be used as a reducing agent in reaction