Lewis Bases

Q. In the reaction $I_2+I^{-}\rightleftharpoons I_3^{-},$
Which of the following acts as a Lewis base is:

1. $I_2$
2. $I^{-}$
3. $I_3^{-}$
4. None of these

Q.

Is nucleophile a base or acid?

Q.

Acetic acid is a tribasic acid.

1. True
2. False

Q.

With what neutral molecules is $Cl{O}^{-}$ isoelectronic? Is that molecule a Lewis base?

Q.

Which of the following cannot act as Lewis base?

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

2. $H_{2}O$

3. $B{F}_3$

4. $N{H}_3$

Q.

The correct statements regarding the acids are
A) $N{H}_3$ can act as both bronsted base as well as Lewis base
B) Dry hydrogen chloride is not Arrhenius acid

C) According to Davy, acid must contain oxygen as necessary element

1. A and B

2. A and C

3. B and C

4. A, B and C

Q. In the reaction $I_2+I^{-}\to I_3^{-}$, the Lewis base is

1. $I_2$
2. $I^{-}$
3. $I_3^{-}$
4. None

Q. Which of the following is strongest base?

1. $Be{\left(OH\right)}_2$
2. $Mg{\left(OH\right)}_2$
3. $Al{\left(OH\right)}_3$
4. $Si{\left(OH\right)}_4$

Q.

Water is a:

1. Lewis base due to unshared electron pair on Oxygen.

2. Lewis base due to unshared and shared electron pair on Oxygen.

3. Lewis base due to high electronegativity of Oxygen.

4. Lewis base due to shared electron pair on Oxygen.

Q. which one is correct regarding hemiacetal formation:

1. $NaOH$ act as nucleophile for carbonyl
2. $NaOH$ increase electrophilicity of acetone.
3. $NaOH$ increase nucleophilicity of methanol.
4. None of the above

Q.

What are the basic particles of ice crystals?

1. cations

2. anions

3. atoms

4. molecules

Q. Which of the following is not a Lewis base ?

1. $A{g}^{+}$
2. $C{N}^{-}$
3. $H_{2}O$
4. $C{H}_{3}OH$

Q.

On what basis do you classify bronsted base on anion?

Q.

Which one of the following acts as a Lewis base in complexes?

1. CO${}_2$
2. NH${}_3$
3. BF${}_3$
4. BCl${}_3$

Q. In the reaction $I_2+I^{-}\to I_3^{-}$, the Lewis base is

1. None
2. 
3. 
4. 

Q.

nh3 is good complexing agent

Q. $3CuO+2N{H}_3\to 3Cu+3H_{2}O+N_2$
In this reaction $N{H}_3$:

1. behaves as a base
2. acts as an acid
3. acts as an oxidising agent
4. acts as a reducing agent

Q. Which is more basic $Mg(OH{)}_2$ or $Al(OH{)}_3$?

Q. Which of the following will qualify as Lewis base ?

1. $N{H}_3$
2. $P{H}_3$
3. Both A and B
4. $BC{l}_3$

Q. Which of the following fluoro-compounds is most likely to behave as a Lewis base ?

1. $Si{F}_4$
2. $B{F}_3$
3. $C{F}_4$
4. $P{F}_3$

Q.

Which of the following cannot act as Lewis base?

1. CH₃NH₂

2. H₂O

3. BF₃

4. NH₃

Q. With what neutral molecule is $Cl{O}^{-}$ isoelectronic? Is that molecule a Lewis base?

Q. Which of the following are Lewis acid?

1. $PC{l}_3$
2. $AlC{l}_3$
3. $NC{l}_3$
4. $B{F}_3$

Q.

Give the basicity of

(b) acetic acid.

Q.

All nucleophiles are

1. Arrhenius acid

2. Bronsted bases

3. Lewis acids

4. Lewis bases

Q. Which of the following will qualify as Lewis base ?

1. $BC{l}_3$
2. $N{H}_3$
3. $P{H}_3$
4. Both A and B

Q.

All nucleophiles are

1. Lewis acids

2. Lewis bases

3. Arrhenius acid

4. Bronsted bases

Q. Which of the following species (molecule or ion) can behave both as a Lewis Base as well as a Bronsted base?

1. $B{F}_3$
2. $C{l}^{-}$
   
3. $CO$
   
4. None of the above

Q. Which of the following fluoro-compounds is most likely to behave as a Lewis base ?

1. $C{F}_4$
2. $Si{F}_4$
3. $B{F}_3$
4. $P{F}_3$