Huckel's Rule of Aromaticity

Q. Which of the following chemical systems is non-aromatic?

1. 
2. 
3. 
4. 

Q.

Aromatic compounds burn with sooty flame because

1. They have a relatively high percentage of hydrogen

2. They have a relatively high percentage of carbon

3. They have a ring structure

4. They are reluctant to react with atmospheric oxygen.

Q. How do you explain the absence of aldehyde group in the pentaacetate of $D$-glucose?

Q.

Write the chemical equation for each of the following:

Oxidation of ethanol by ${\mathrm{KMnO}}_4$.

Q.

How can you prepare alkenes? Give any two methods of preparations of alkenes with equations.

Q. Among the following, the compound that can be most readily sulfonated is

1. benzene
2. nitrobenzene
3. toluene
4. chlorobenzene

Q.

What is the difference between acyl and alkyl?

Q. Given below are two statements: one is labelled as Assertion A and, the other is labelled as Reason R.
Assertion A: [6] Annulene, [8] Annulene and cis-[10] Annulene, are respectively aromatic, not-aromatic and aromatic.

Reason R: Planarity is one, of the requirements of aromatic systems.
In the light of the above statements, choose the most appropriate answer from the options given below.

1. Both A and R are correct but R is NOT the correct explanation of A
2. A is correct but R is not correct
3. Both A and R are correct and R is the correct explanation of A
4. A is not correct but R is correct

Q.

Why are there only 8 electrons in the outer shell?

Q.

Ethanol on complete oxidation gives

1. carbon dioxide and water

2. acetaldehyde

3. acetic acid

4. acetone

Q. What is the correct order of nitration of the following compounds?
$\underset{a}{C_6{H}_{5}C{H}_3}\underset{b}{C_6{H}_6}\underset{c}{C_6{D}_6}\underset{d}{C_6{T}_6}\underset{e}{C_6{H}_{5}Br}\underset{f}{C_6{H}_{5}N{R}_3^{+}}\underset{g}{C_6{H}_{5}NM{e}_2}$

1. g > a > b = c = d > e > f
2. g > a > b > c = d > e > f
3. g > b > c > d > e > a > f
4. g > a > b > c > d > e > f

Q. Which of the following reactions belong to electrophilic aromatic substitution?

Q. Match List – I with List – II

	List-I		List-II
(A)		(I)	Spiro compound
(B)		(II)	Aromatic compound
(C)		(III)	Non-planar Heterocyclic compound
(D)		(IV)	Bicyclo compound

1. $\left(A\right)–\left(IV\right),\left(B\right)–\left(III\right),\left(C\right)–\left(I\right),\left(D\right)–\left(II\right)$
2. $\left(A\right)–\left(II\right),\left(B\right)–\left(I\right),\left(C\right)–\left(IV\right),\left(D\right)–\left(III\right)$
3. $\left(A\right)–\left(IV\right),\left(B\right)–\left(III\right),\left(C\right)–\left(II\right),\left(D\right)–\left(I\right)$
4. $\left(A\right)–\left(III\right),\left(B\right)–\left(IV\right),\left(C\right)–\left(I\right),\left(D\right)–\left(II\right)$

Q. Which of the following is best method for making isopropyl methyl ether?

1. $C{H}_{3}I+(C{H}_3{)}_{2}CHOH$
2. $C{H}_{3}I+(C{H}_3{)}_{2}CH{O}^{-}$
3. $(C{H}_3{)}_{2}CHCl+C{H}_{3}OH$
4. $(C{H}_3{)}_{2}CHI+C{H}_3{O}^{-}$

Q. Among the following cyclic ions and compounds, aromatic character is shown by:

1. P and S
2. Q and S
3. Q and R
4. P, Q, R and S

Q.
How many of these are anti-aromatic in nature?

Q. How will you convert

$1)$ Benzene into aniline

$2)$ $\text{Benzene into N, N-dimethylaniline}$

$3)$ $\text{Cl-(}C{H}_2{)}_4\text{-Cl into hexan-1, 6-diamine}$

Q.

Which one of the following is aromatic?

1. Cyclopentadienyl cation

2. Cyclooctatetraene

3. Cycloheptatriene

4. Cycloheptatrienyl cation

Q. Why F2 has less Bond Enthalpy than that of F2, O2, N2.

Q.

Which of the following has a conjugated system?

1. 

2. 

3. 

4. 

Q.

What are the necessary conditions for any system to be aromatic?

Q.

Whether the hydrogen bond will occur in Cl-H-O, if it occurs why?

Q. Which is non benzenoid aromatic compound?

1. pyridine
2. toluene
3. phenol
4. benzene

Q. The ring systems having the following characteristics are aromatic.

(i) Planar ring containing conjugated $\pi$ bonds.

(ii) Complete delocalisation of the $\pi$− electrons in ring system i.e., each atom in the ring has unhybridized $p$−orbital, and

(iii) Presence of $(4n+2)\pi$−electrons in the ring where n is an integer $(n=0,1,2,\dots \dots \dots \dots \dots )$ (Huckel rule).
Using this information classify the following compounds as aromatic/nonaromatic

Q. Find whether given compounds are aromatic or non aromatic.

Q. Which of the following options are not in accordace with the property mentioned against them?

1. $HI<HBr<HCl<HF$
   Hydrogen halogen bond strength
2. $F_2>C{l}_2>B{r}_2>I_2$
   Bond dissociation
3. $MI>MBr>MCl>MF$
   Ionic character of metal halide.
4. $F_2>C{l}_2>B{r}_2>I_2$
   Oxidizing power

Q. Aromatic compounds burn with sooty flame because:

1. they have a ring structure of carbon atoms
2. they have a relatively high percentage of hydrogen
3. they resist reaction with oxygen or air
4. they have a relatively high percentage of carbon

Q. Define Benzenoid aromatic compounds with one example.

Q.

Write the formula and name of each product in the following reaction:

(i) Reaction of ethanol with sodium

Q.

What is isomerism? Name the kind of isomerism shown by alkanes