Preparation of Benzene and Homologues

Q.

$224\mathrm{mL}$ of ${\mathrm{SO}}_2\left(\mathrm{g}\right)$ at $298\mathrm{K}$ and $1\mathrm{atm}$ is passed through $100\mathrm{mL}$ of $0.1\mathrm{M}\mathrm{NaOH}$ solution. The non-volatile solute produced is dissolved in $36\mathrm{g}$ of Water. The lowering of vapour pressure of solution (assuming the solution is dilute) $({\mathrm{P}}_{\left(\mathrm{H}2\mathrm{O}\right)}=24\mathrm{mm}\mathrm{of}\mathrm{Hg})$ is $\mathrm{x}\times {10}^{–2}\mathrm{mm}\mathrm{of}\mathrm{Hg}$, the value of $\mathrm{x}$ is _____

Q.

why chloromethane have more dipole moment than fluoromethane?

Q. What happens when sodium benzoate is heated with soda lime?

1. Formation of phenol take place
2. Formation of benzene take place
3. Formation of benzoic acid take place
4. Formation of toluene take place

Q.

What is the bond order in ${{\mathrm{NO}}_2}^{+}$?

Q.

Order by bond length?$\mathrm{NO},{\mathrm{NO}}^{+},{\mathrm{NO}}^{-}$

Q. Assertion (A): Among isomeric pentanes, 2, 2-
dimethylpentane has highest boiling point.

Reason (R): Branching dose not affect the boiling point.

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

Q.

Which of the following reagent is used in Finkelstein reaction?

1. HBr

2. NaI in dry acetone

3. CCl₄

4. HCl, ZnCl₂

Q.

Which of the following has cross-linked polymer chains?

1. Bakelite

2. Polyester

3. PVC

4. Nylon

Q. How many Pi and sigma bond does propane contains

Q.

In the following reaction sequence, structures of A and B, respectively will be:

1. 

2. 

3. 

4. 

Q. The major organic product formed from the following reaction 3-Methylbutan-2-one [ (i)CH3NH2 (ii)LiAlH4 (iii)H2O ] ------> [AIPMT (Prelims)-2005]

Q.

Identify AB and rewrite the following reaction H3C-CH2-CH2-OH-socl2--->(A) -alc. KOH---->(B) .

Q. The correct configuration assigned for compounds (I) and (II) respectively are:

1. R, R
2. S, S
3. R, S
4. S, R

Q. The conversion of phenyl methyl ketone to ethylbenzene in one step is brought about by which reagent?

1. $LiAl{H}_4$
2. $Zn\left(Hg\right)/HCl$
3. $C{H}_{3}MgBr$
4. $NaB{H}_4$

Q. The tests performed on compound $X$ and their inferences are given below:

Test	Inference
(a) 2, 4-DNP test	Coloured precipitate
(b) Idoform test	Yellow precipitate
(c) Azo-dye test	No dye formation

Compound '$X$' is:

1. 
2. 
3. 
4. 

Q.

6(b). List some solvents other than water and state their uses.

Q. 16. In which excited state is Chlorine in ClF3 ? 1) First 2) Second 3) Third 4) Fourth

Q.

Can we use bromine water test to distinguish between phenol and benzoic acid?

Q. 95.What are enolizable hydrogen and alpha carbon?

Q. how do u write electronic configuration of a heteroatomic molecule by Molecular orbital theory?

Q. Aniline reacts with carbonyl chloride and forms.

1. chlorobenzene
2. phenyl cyanate
3. phenyl cyanide
4. phenyl isocyanate

Q.

Which one amongst the following possesses an sp hybridized carbon in its structure

1. 

2. 

3. 

4. 

Q. What are polar and non-polar solvents?

Q. One mole of an organic compound 'A' with the formula $C_4{H}_{10}O$ reacts completely with excess of hot conc. HI to form X and Y. 'X' and 'Y' respond to wurtz reaction. The compound 'A' is____________

1. methoxyethane
2. propan-1-ol
3. ethoxyethane
4. propan-2-ol

Q. Benzene is obtained by

1. Polymerisation of three C₂H₂ molecules
2. Condensation of three C₂H₂ molecules
3. Substitution of three acetylene molecules
4. Addition of three C₂H₂ molecules

Q. Heat of hydrogenation of cyclohexene is $x_1$ and that of benzene is $x_2$. Hence, resonance energy is:

1. $x_1-x_2$
2. $x_1-x_3$
3. $3x_1-x_2$
4. $x_1-3x_2$

Q. STATEMENT-1: The $C-O$ bond length of aliphatic alcohols is less than that of phenols.
STATEMENT-2: In phenols, the $C-O$ bond acquires a π-bond character.

1. Both statements are true and STATEMENT-2 is the correct explanation of STATEMENT-1
2. Both statements are true and STATEMENT-2 is not the correct explanation of STATEMENT -1
3. STATEMENT-1 is true but STATEMENT-2 is false
4. STATEMENT-1 is false but STATEMENT-2 is true

Q. In the below reaction, the product X is:
$\text{Phenol +Zn dust}\stackrel{\Delta }{⟶}X$

1. Benzene
2. Toluene
3. Phenoxide
4. Benzoquinone

Q. The conversion of phenyl methyl ketone to ethylbenzene in one step is brought about by which reagent?

1. $NaB{H}_4$
2. $C{H}_{3}MgBr$
3. $LiAl{H}_4$
4. $Zn\left(Hg\right)/HCl$

Q. What is the priority series of the functional groups exhibiting +I effect ?