Resonance

Q.

Which of the following will have the maximum Dipole Moment?

1. ${\mathrm{CH}}_3\mathrm{I}$

2. ${\mathrm{CH}}_3\mathrm{F}$

3. ${\mathrm{CH}}_3\mathrm{Br}$

4. ${\mathrm{CH}}_3\mathrm{Cl}$

Q. Molecular orbital diagram of H2

Q.

Which among the following compound is the strongest base?

1. ${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{NH}}_2$

2. ${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{CH}}_2{\mathrm{NH}}_2$

3. $\mathrm{p}-{\mathrm{NO}}_2{\mathrm{C}}_6{\mathrm{H}}_4{\mathrm{NH}}_2$

4. $\mathrm{m}-{\mathrm{NO}}_2{\mathrm{C}}_6{\mathrm{H}}_4{\mathrm{NH}}_2$

Q.

A reagent that can help us to distinguish between alkenes and alkynes.

1. Bromine water

2. Carbon tetrachloride

3. Alkaline ${\mathrm{KMnO}}_4$

4. Ammoniacal Cuprous chloride

Q. Find the number of molecules which are having 3C–2e and which have 2C-2e bond from the following. Al2(CH3)6, Si2H6, B2H6, C2H6, Si2Cl6, Al2Cl6 (Explain with structure of each to clear concept)

Q.

Ab, A₂ And B₂ Are Diatomic Molecules. If The Bond Enthalpies Of A₂, Ab And B₂ Are In The Ratio 1:1:0.5 And Enthalpy Of Formation Of Ab From A ₂ And B₂ Is −100 Kj Mol−1. What Is The Bond Energy Of A₂?

Q. What is resonance ? And why does it occurs ?

Q. All $C-C$ bonds in benzene are equal due to

1. Tautomerism
2. Inductive effect
3. Resonance
4. Isomerism

Q. Dancing resonance??

Q. Which is more acidic p-nitroaniline or aniline

Q. Which of the following is correct regarding the bond order in $S{O}_4^{2-}$ ion?

1. 3/2
2. 5/4
3. 4/3
4. 2

Q.

Why does intramolecular hydrogen bonding decrease the boiling point of the compound?

Q. A gas deviates from ideal behaviour at a high pressure because its molecules:

1. Attract one another
2. Show the Tyndall effect
3. Have kinetic energy
4. Are bound by covalent bonds

Q.

Most stable carbanion is

1. 

2. 

3. 

4. 

Q.

What is a resonance hybrid? Give one example.

Q. Azide ion $\left[N_3^{-}\right]$ exhibits an $(N-N)$ bond order of 2 and may be represented by the resonance structures I, II and III given below:

The most stable resonance structure is

1. I
2. II
3. III
4. All of them have equal stability

Q. Choose the most stable canonical form among the following structures:

1. I
2. II
3. III
4. All the structures are equally stable

Q.

Why does acetylation of $-N{H}_2$ group of aniline reduce its activating effect?

Q.

Which one of the ethane, ethene, and ethyne will form a white precipitate with an ammonical solution of silver nitrate.

Q.

Why is resonance more stable than hyperconjugation?

Q.

Write the resonance structures for $S{O}_3$, $N{O}_2$ and $N{O}_3^{-}$ .

Q.

why Benzylamine is more basic than N-Methylamine

Q.

The correct increasing order of acidity is:

1. $H_{2}O,C_2{H}_2,H_{2}C{O}_3,phenol$

2. $C_2{H}_2,H_{2}O,H_{2}C{O}_3,phenol$

3. $Phenol,C_2{H}_2,H_{2}C{O}_3,H_{2}O$

4. $C_2{H}_2,H_{2}O,phenol,H_{2}C{O}_3$

Q. The boiling point of haloalkanes are higher than the parent hydrocarbon of comparable molecular mass because

1. Addition of the halogen introduces polarity in the molecule
2. Increase in the Vander-Waals forces of attraction
3. Increase in the molecular mass due to the presence of halogen
4. all of the above

Q.

Why is the heat of hydrogenation of benzene less than expected?

Q. A: The presence of nitro group facilitatesnucleophilic substitution reactions in arylhalidesR: The intermediate carbanion is stabilised due tothe presence of nitro group.

Q. Intramolecular hydrogen bonding is found in :

1. Salicyldehyde
2. Water
3. Phenol
4. Acetaldehyde

Q.

What is called no bond Resonance?

Q.

What is delocalisation

Q.

Structural formula of ethyne is-

1. 

2. 

3. 

4.