Question

Sodium borohydride reacts with iodine in the presence of diglyme to give A. A heated at 388 K give B. A heated at 373 K in sealed tube to form C. A further heated at red hot condition to give element D. Find out A, B, C and D. Give the reactions.

Answer 1

1. Sodium borohydride reacts with iodine in the presence of diglyme to give diborane (A).

2. Diborane (A) heated at 388 K gives pentaborane (11) (B).

3. Diborane (A) heated at 373 K in the sealed tube to form decaborane (14) (C).Diborane (A) heated at red hot conditions to give element boron (D) Diborane B₂H₆

A	Diborane	B2H6
B	Pentaborane-11	B5H11
C	Decaborane-14	B10H14
D	Boron	B