Diborane

Q.

Which one of the following statements is not true regarding diborane?

1. When methylated, the product is Me₄B₂H₂

2. It has two bridging hydrogenes and four perpendicular to the rest

3. The bridging hydrogenes are in a plane perpendicular to the rest.

4. All the B-H bond distances are equal.

Q. Iodine oxidises sodium borohydride to give

AIIMS 2011

1. $HI$
2. $B_2{H}_6$
3. $I_3^{-}$
4. sodium hydride

Q.

In which of the following, a salt of type $KM{O}_2$ (M = Al or B) is obtained?

1. 

2. 

3. 

4. 

Q.

$B_2{H}_6.2N{H}_3\underset{{200}^{\circ }C}{\overset{\Delta }{\to }}A+H_2$. A is as follows

1. 

2. 

3. 

4. 

Q.

Among the following, the correct statement(s) is are:

1. $Al(C{H}_3{)}_3$ has the three-center two-electron bonds in its dimeric structure

2. The Lewis acidity of $BC{l}_3$ is greater than that $AlC{l}_3$

3. $AlC{l}_3$ has the three-center two-electron bonds in its dimeric structure

4. $B{H}_3$ has the three-center two-electron bonds in its dimeric structure

Q.

$2X+B_2{H}_6⟶\left[B{H}_2\right(X{)}_2{]}^{+}[B{H}_4{]}^{-}$ the amine(s) X is/are:

1. $N{H}_3$

2. $C{H}_{3}N{H}_2$

3. $(C{H}_3{)}_{2}NH$

4. $(C{H}_3{)}_{3}N$

Q. The structure of diborane contains:

1. four $2C-2e$ bonds and two $3C-2e$ bonds
2. two $2C-2e$ bonds and four $3C-2e$ bonds
3. two $2C-2e$ bonds and two $3C-2e$ bonds
4. four $2C-2e$ bonds and four $3C-2e$ bonds

Q.

Diborane

1. is electron deficient

2. burns spontaneously in air

3. has 3c-2e bonds

4. all of the above

Q. Which of the following are reducing agents?

1. Diborane
2. $LiB{H}_4$
3. $LiAl{H}_4$
4. $NaB{H}_{3}CN$

Q. $B_2{H}_6+N{H}_3\underset{\text{low temperature}}{\overset{\text{excess of}N{H}_3}{\to }}A$
Compound A is ionic in nature which on strong heating gives a compound which is aromatic in nature. Sum of number of lone pair(s) present in cationic and anionic part of A is