Electromeric Effect

Q. The correct order of acidity for the following compounds is:

1. I > II > III > IV
2. III > I > II > IV
3. III > IV > II > I
4. I > III > IV > II

Q.

How hybridisation of [Ti(H₂O)₆]³⁺ is d²sp³ and is paramagnetic?Please explain on the basis of VBT electronic configuration diagram.

Q. The weakest acid among the following is

1. Benzoic acid
2. o-nitrobenzoic acid
3. Cyclohexanecarboxylic acid
4. p-nitrobenzoic acid

Q.

Ortho and para nitrophenols are more acidic than phenol. Draw the resonance structures of the corresponding phenoxide ions.

Q. Which one of the following does not exhibit electromeric effect?

1. Aldehydes
2. Ketones
3. Alkenes
4. Ethers

Q. Which of the following compounds will show the maximum enol content?

1. $C{H}_{3}COC{H}_3$
2. $C{H}_{3}COC{H}_{2}COC{H}_3$
3. $C{H}_{3}COC{H}_{2}COO{C}_2{H}_5$
4. $C{H}_{3}COC{H}_{2}CON{H}_2$

Q. How to find the number of monovalent atom, hybridisation and shape of a molecule easily?

Q. The temporary effect in which there is a complete transfer of shared pair of $\pi -$ electrons to one of the atoms joined in a multiiple bond on the demand of an attacking reagent is called;

1. electromeric effect
2. hyper conjugation
3. negative resonance effect
4. inductive effect

Q. Which of the following is true regarding electromeric effect?

1. Involves complete shifting of $\pi$ electrons.
2. It is a temporary effect.
3. In -E effect , $\pi$ electrons of the multiple bond are transferred to the atom to which the reagent gets attached.
4. It operates in organic compounds having multiple bonds under the influence of an outside attacking species.

Q.

Please explain +E and -E electromeric effects with examples.

Q. Which of the following structure will be produced when a 'ring flip' occurs in the chair form of the following compound ?

1. 
2. 
3. 
4. 

Q.

How do you Add Methyl to Benzene?

Q. Circle represent most acidic hydrogens in these molecules. Which of the following is correct representation?

1. 
2. 
3. 
4. All of these

Q. Which of these will produce the highest yield in Friedel Craft reaction ?

1. 
2. 
3. 
4. 

Q. 8. Osazone formation ?

Q.

Which one of the following is more acidic?

1. Butane

2. 1-Butene

3. 1-Butyne

4. 2-Butyne

Q.

The strongest acid among the following compound is:

1. Acetic acid

2. Formic acid

3. 4-chlorobutanoic acid

4. 2-chlorobutanoic acid

Q. Which of the following(s) is/are an examples of $-E$ effect?

1. 
2. 
3. 
4. 

Q. When a nucleophile attacks a carbonyl compound, the one which is most reactive towards the nucleophile is:

1. $C{H}_{3}COCO{C}_2{H}_5$
2. $C{H}_{3}COC{H}_{2}Cl$
3. $\text{4-Methoxybenzaldehyde}$
4. $C{H}_{3}COC{H}_{2}C{H}_{2}Cl$

Q. Electromeric effect

1. Involves displacement of electrons in a sigma bond
2. Comes into play in the molecule when at least one atom has unshared pair of electrons
3. Involves the distortion of electron cloud
4. Comes into play at the demand of attacking reagent

Q. Assertion. N2O5 is more acidic than N2O3. Reason. Magnitude of positive charge is more on N2O5. 1 Both assertion and reason is true and reason is correct explanation of assertion 2 Both assertion and reason is true and reason is not correct explanation of assertion. 3. Reason is true and assertion is false. 4. Both assertion and reason is false

Q.
Among the given compounds, the increasing order of stability of conjugate base is :

1. $D<C<B<A$
2. $A<B<C<D$
3. $A<D<B<C$
4. $B<C<D<A$

Q.

The charge on C atom in C-Mg bond in Grignard reagent is:

1. Positive

2. Neutral

3. Partial positive

4. Partial negative

Q.

Although both CO₂ and H₂O are triatomic molecules, the shape of H₂O molecule is bent while that of CO₂ is linear. Explain this on the basis of dipole moment.

Q.

Arrange the following according to their increasing order of boiling points.

1. C₂H₅NH₂<C₃H₈<HCOOH<C₂H₅OH

2. C₂H₅OH<C₂H₅NH₂<C₃H₈<HCOOH

3. C₂H₅NH_2<C₃H₈<C₂H₅OH<HCOOH

4. C₃H₈<C₂H₅NH₂<C₂H₅OH<HCOOH

Q. calculate the carbonate conc. in [CO3 ] in a 0.10 M solution of the weak acid, carbonic acid (H2CO3 ). The dissociation constants of carbonic acid are Ka1 =4.5*10^-7 & Ka2*10^-11 and . (1) 4.7 × 10^-4 M (2) 1.0 × 10^-4 M (3) 4.5 × 10^-4 M (4) 2.1 × 10^-4 M

Q. Assertion :When inductive and electromeric effects operate in opposite direction, the inductive effect predominates. Reason: Inductive effect is the complete transfer of shared pair of $\pi$ electrons to one of the atoms.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. 26 : Does [FeCl3(NH3)3] show geometrical isomerism?

Q. 10. What is the function of electrochemical series?

Q. The temporary effect in which there is a complete transfer of shared pair of $\pi -$ electrons to one of the atoms joined in a multiiple bond on the demand of an attacking reagent is called;

1. inductive effect
2. electromeric effect
3. hyper conjugation
4. negative resonance effect