Diborane

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Q. Incorrect statement regarding X in the given reaction is:

B F_{3} + L i A l H_{4} \to (X) + L i F + A l F_{3}

12 electrons are involved in bonding
It has four (2 centre-2 electron) bonds
It has two (three centre-two electron) bonds
X does not react with ammonia

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Q. Diborane undergoes cleavage and gives adduct with
(i) CO
(ii)

H_{2} O

(iii)

N M e_{3}

(iv)

N H_{3}

i, ii
i, iii
ii, iii
i, iv

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Q. On hydrolysis diborane produce?

$H_{3} B O_{2} + H_{2} O_{2}$
$B_{2} O_{3} + O_{2}$
$H_{3} B O_{3} + H_{2}$
$H_{3} B O_{2} + H_{2} O$

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$L i H + B_{2} H_{6} E t h e r - -- \to A .$ A is as follows

$L i B H$
$L i B H_{2}$
$L i B H_{4}$
$None of these$

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Q. By which of the following reactions borazine is prepared?

$B_{2} H_{6} + N H_{3} (excess) low temperature - -------- \to$
$B_{2} H_{6} + N H_{3} (excess) high temperature - ----------------- \to Higher temperature (> 200^{o} C)$
$B_{2} H_{6} + N H_{3} high temperature (200^{o} C) - -------------- \to r a t i o 2 N H_{3} : 1 B_{2} H_{6}$
None of these

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Q. Which of the following statement is correct for diborane?

Small amines like $N H_{3}, C H_{3} N H_{2}$ give unsymmetrical cleavage of diborane
Large amines such as $(C H_{3})_{3} N$ and pyriding gives symmetrical cleavage of diborane
Small as well as large amines both gives symmetrical cleavage of diborane
(A) and (B) both

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Q. Which of the following reaction will give diborane as the product?

$2 N a B H_{4} + I_{2} \to$
$L i A l H_{4} + B F_{3} \to$
Both (A) and (B)
None of these

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Q. Borohydrides are prepared by reaction of metal hydrides with

B_{2} H_{6}

in diethyl ether, select incorrect statement:

Hybridisation of Boron changes
Metal $M$ can be $L i o r N a$
Geometry around boron is tetrahedral in both reactant and product
Boron hydrides are used as reducing agent

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Q. In the given reaction,

B_{2} H_{6} + 2 K O H + 2 X \to 2 Y + 6 H_{2},

X and Y are respectively

$H_{2} O, K B O_{3}$
$H_{2}, H_{3} B O_{3}$
$H_{2} O, K B O_{2}$
$H C l, K B O_{3}$

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Q. The structure of diborane

(B_{2} H_{6})

contains

Four $2 c - 2 e^{-}$ bonds and two $3 c - 2 e^{-}$ bond
Four $2 c - 2 e^{-}$ bonds and four $3 c - 2 e^{-}$ bonds
Two $2 c - 2 e^{-}$ bonds and four $3 c - 2 e^{-}$ bonds
Two $2 c - 2 e^{-}$ bonds and two $3 c - 3 e^{-}$ bond

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Q. A compound of boron X reacts at

200^{\circ} C

temperature with

N H_{3}

to give another compound

Y

which is called as inorganic benzene. The compound

Y

is a colourless liquid and is highly sensitive. Its melting point is

- 57^{\circ} C

. The compound

X

with excess

N H_{3}

and at a still higher temperature gives boron nitride

{(B N)}_{n}

. The compounds

X

and

Y

respectively are:

$B H_{3} and B_{2} H_{6}$
$N a B H_{4} and C_{6} H_{6}$
$B_{2} H_{6} and B_{3} N_{3} H_{6}$
$B_{4} C_{3} and C_{6} H_{6}$

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Q. The structure of diborane

(B_{2} H_{6})

contains

Four $2 c - 2 e^{-}$ bonds and four $3 c - 2 e^{-}$ bonds
Two $2 c - 2 e^{-}$ bonds and two $3 c - 3 e^{-}$ bond
Two $2 c - 2 e^{-}$ bonds and four $3 c - 2 e^{-}$ bonds
Four $2 c - 2 e^{-}$ bonds and two $3 c - 2 e^{-}$ bond

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B - H - B

bridge in

B_{2} H_{6}

is formed by the involvement of:

2 electrons
4 electrons
1 electrons
3 electorns

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Q. On hydrolysis diborane produce?

$H_{3} B O_{2} + H_{2} O_{2}$
$H_{3} B O_{3} + H_{2}$
$B_{2} O_{3} + O_{2}$
$H_{3} B O_{2} + H_{2} O$

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What is an alkyl group?

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N a B H_{4} + I_{2} \to X + Y + Z

B F_{3} + N a H 450 K - -- \to X + P

B F_{3} + L i A l H_{4} \to X + Q

Identify

X, Y, Z, P and Q .

$X - B_{2} H_{6}, Y - B H_{3}, Z - N a I, P - B_{3} N_{3} H_{6}, Q - A l_{2} F_{6}$
$X - N a_{4} B_{4} O_{7}, Y - N a I, Z - H I, P - H F, Q - 3 L i [A l F 4]$
$X - B_{2} H_{6}, Y - N a I, Z - H_{2}, P - N a F, Q - 3 L i [A l F 4]$
$X - B H_{3}, Y - B_{2} H_{6}, Z - H_{2}, P - B_{2} N_{3} H_{6}, Q - 3 L i [A l F 4]$

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Q. By which of the following reactions borazine is prepared?

$B_{2} H_{6} + N H_{3} (excess) low temperature - -------- \to$
$B_{2} H_{6} + N H_{3} (excess) high temperature - ----------------- \to Higher temperature (> 200^{o} C)$
$B_{2} H_{6} + N H_{3} high temperature (200^{o} C) - -------------- \to r a t i o 2 N H_{3} : 1 B_{2} H_{6}$
None of these

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Q. The product obtained in the reaction of diborane with excess of ammonia at low temperature is:

$3 B_{2} H_{6} \cdot 2 N H_{3}$
$(B N)_{2}$
$B_{3} N_{3} H_{6}$
$(B N)_{4}$

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Q. Reaction of ammonia with excess

C l_{2}

gives

 JEE MAINS 2020

$N C l_{3} and N H_{4} C l$
$N C l_{3} and H C l$
$N H_{4} C l and N_{2}$
$N H_{4} C l and H C l$

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Q. Which of the following gives

B_{2} H_{6}

on reaction with

N a B H_{4} .

$L i A l H_{4}$
$O_{2}$
$I_{2}$
$H_{2} O$

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Q. Heating together sodium ethoxide and ethyl chloride will give:

Ethyl alcohol
Ether
Acetic acid
Acetaldehyde

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Q. Diborane is a :
1. Colourless gas
2. Coloured gas
3. Toxic gas
4. Non-toxic gas

1, 2
1, 3
1, 2, 3
2, 4

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In which of the following, a salt of type $K M O_{2}$ (M = Al or B) is obtained?

$B_{2} H_{6} + K O H (a q) \to$
$A l + K O H (a q) \to$
$Both (a) & (b)$
$None of the above$

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Q. Which of the following product(s) may be formed by the reaction of diborane with ammonia?

$(B N)_{x}$
$3 B_{2} H_{6} \cdot 2 N H_{3}$
$B_{3} N_{3} H_{6}$
$B_{2} H_{6} \cdot N H_{3}$

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Q. Borohydrides are prepared by reaction of metal hydrides with

B_{2} H_{6}

in diethyl ether, select incorrect statement:

Hybridisation of Boron changes
Metal $M$ can be $L i o r N a$
Geometry around boron is tetrahedral in both reactant and product
Boron hydrides are used as reducing agent

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Q. Which of the following statements is incorrect regarding diborane?

It has only two bridging hydrogens
When methylated, the product formed is $M e_{4} B_{2} H_{2}$
The bridging hydrogen atoms are in a plane perpendicular to the other ones
All the B-H bonds are of equal lengths

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Q. Diborane is a Lewis acid forming addition compound

B_{2} H_{6} \cdot 2 N H_{3}

with

N H_{3},

a Lewis base. This -

Is ionic and exists as $[B H_{2} (N H_{3})_{2}]^{+}$ and $[B H_{4}]^{-}$ ions
On heating, is converted into borazine, $B_{3} N_{3} H_{6}$ (called inorganic benzene)
Both are correct
None is correct

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Q. Diborane

(B_{2} H_{6})

reacts independently with

O_{2}

and

H_{2} O

to produce, respectively.

$B_{2} O_{3}$ and $H_{3} B O_{3}$
$B_{2} O_{3}$ and $[B H_{4}]^{-}$
$H_{3} B O_{3}$ and $B_{2} O_{3}$
$H B O_{2}$ and $H_{3} B O_{3}$

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$L i H + B_{2} H_{6} E t h e r - -- \to A .$ A is as follows

$L i B H$
$L i B H_{2}$
$L i B H_{4}$
$None of these$

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Q. Which of the following are reducing agents?

Diborane
$L i B H_{4}$
$L i A l H_{4}$
$N a B H_{3} C N$

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