Q.

Hydride of boron occurs as B2H6 but B2Cl6 does not exist. This is because

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a

Boron and chlorine have almost equal atomic sizes

b

- back bonding is possible in B2H6 but not in B2Cl6

c

Small hydrogen atoms can easily fit in between boron atoms but large chlorine atoms do not

d

Boton and hydrogen have almost equal values of electronegativity

answer is D.

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Detailed Solution

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Hydride of boron occurs as B2​H6​ but B2​Cl6​ does not exist. This is because small hydrogen atoms can easily fit in between boron atoms but large chlorine atoms do not.
Note: Instead of B2​Cl6​, the stable compound is BCl3​ which acts as a Lewis acid and accepts a lone pair of electrons from ammonia to form BCl3​←NH3​.

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