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Diborane

Diborane

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Q. Haloalkanes react with

K C N

to form alkyl cyanides as main product while

A g C N

form isocyanides as the chief product. Explain.

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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.

Write the reaction of ethene with bromine.

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Q. Three moles of

B_{2} H_{6}

are completely reacted with methanol.
The number of moles of boron containing product formed is

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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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Q. Diborane reacts with carbon monoxide forming :

a adduct $2 B H_{3} . C O$
an oxidising product $2 B H_{3} . C O$
an oxidising product $B_{2} O_{3}$
an oxidising product $B H_{3}$

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Q. Draw the gas phase and solid phase structure of

H_{2} O_{2}

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Q. Diborane on hydrolysis gives

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Q. Why hydrogen occurs in diatomic form?

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Q. From the

B_{2} H_{6}

all the following can be prepared except :

$H_{3} B O_{3}$
$[B H_{2} (N H_{3})_{2}]^{+} [B H_{4}]^{-}$
$B_{2} (C H_{3})_{6}$
$N a B H_{4}$

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Q.

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

$A l (C H_{3})_{3}$ has the three-center two-electron bonds in its dimeric structure
The Lewis acidity of $B C l_{3}$ is greater than that $A l C l_{3}$
$A l C l_{3}$ has the three-center two-electron bonds in its dimeric structure
$B H_{3}$ has the three-center two-electron bonds in its dimeric structure

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Q.

Which of the following product is obtained when a mixture of Methane $({CH}_{4})$ and Oxygen $(O_{2})$ is passed through heat Molybdenum $({Mo}_{2} O_{3})$ at $543 K$ and $100$ atm pressure?

Ethanal
Methanol
Methanal
Methanoic acid

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Q. In diborane

4-Bridged hydrogens and two terminal hydrogens are present
2-Bridged hydrogens and four terminal hydrogens are present
None of the above
3-Bridged and three terminal hydrogens are present

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Q.

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

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

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

Identify

X, Y, Z, P and Q .

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

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Q. In the reaction,

2 X + B_{2} H_{6} \to [B H_{2} (X)_{2}]^{+} [B H_{4}]^{-}

the amine(s) X is/are

$N H_{3}$
$C H_{3} N H_{2}$
$(C H_{3})_{2} N H$
$(C H_{3})_{3} N$

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Q. Compound formed when

B_{2} H_{6}

reacts with oxygen is

Hydrogen gas
$B_{2} O_{3}$
No reaction
$B O_{2}$

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Q. The reagent used to convert

C H_{3} C H_{2} C O O H \to C H_{3} C H_{2} C H_{2} O H

is

$N a B H_{4}$
$N a / Dry Ether$
$R M g X, H_{3} O^{+}$
$L i A l H_{4}$

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Q. Low volatile nature of

H_{2} S O_{4}

is due to:

Strong bonds
Hydrogen bonding
Van der Waals' forces
None of these

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Q. Species having same bond order are:

$O_{2}^{-}$
$F_{2}^{+}$
$N_{2}^{-}$
$N_{2}$

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Q. Nickel

(Z = 28)

combines with an uninegative monodentate ligand to form a diamagnetic complex

[N i L_{4}]^{2 -}

. The hybridisation involved and the number of unpaired electrons present in the complex are respectively:

$d s p^{2}$ , one
$s p^{3}$ , two
$d s p^{2}$ , zero
$s p^{3}$ , zero

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Q. Which of the following salt is used in borax bead test?

$K_{2} S O_{4} A l_{2} (S O_{4})_{3} .24 H_{2} O$
$N a_{2} B_{4} O_{7} .10 H_{2} O$
$C a S O_{4} .2 H_{2} O$
None of these

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Q. Diborane (

B_{2} H_{6}

) reacts independently with

O_{2}

and

H_{2} O

to produce, respectively:

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

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Q. Give reasons for the following:

A)

C C l_{4}

is immiscible in water, whereas

S i C l_{4}

is easily hydrolysed

B) Carbon has a strong tendency for catenation compared to silicon.

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Q. Tert-butyl methyl ether on cleavage with one equivalent of

H I

gives:

Tert-butanol + methyl iodide
Tert-butyl iodide + methyl alcohol
Isobutylene + methyl alcohol
Isobutylene + methane

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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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Q. The coordination numbers of

C o

and

A l

in

[C o C l (e n)] C l_{2}

and

K_{3} [A l (C_{2} O_{4})]

, respectively, are (en = ethane-1, 2-diamine):

$5 and 3$
$3 and 3$
$6 and 6$
$5 and 6$

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Q. The major product formed when 1, 1, 1-trichloropropane is slightly heated with aqueous potassium hydroxide is:

Propyne
1-Propanol
2-Propanol
Propanoic acid

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Q.

Write the equation when Ethene reacts with water.

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Q. Number of sigma bonds present in borazine is same as :

Benzene
Toluene
Aniline
Phenol

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Q.

[C o (e n)_{2} (N H_{3}) C l]^{2 +}

is known to be a diamagnetic complex. What is the type of hybridisation it shows ?

$d s p^{2}$
$s p^{3}$
$d^{2} s p^{3}$
$s p^{3} d^{2}$

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