Addition Reaction

Q.

Although chlorine is an electron withdrawing group, yet it is ortho-, para- directing in electrophilic aromatic substitution reactions .Its answer is given in NCERT but it doesn't make any sense to me. Please explain it in detail !

Q. the no. of moles of N-atom in 18.066 * 10^23 nitrogen atom is?

Q.

Aldehydes are more reactive toward nucleophilic addition reactions than ketones.

Q.

Why NO2 shows -M effect.

Q.
The major product of the above reactions is :

Q.

Though bromine is less electronegative than fluorine BF₃ is weaker Lewis acid than BBr_3. Explain.

Q.

Classify the following reactions in one of the reaction type studied in this unit.
(a) $C{H}_{3}C{H}_{2}Br+H{S}^{–}\to C{H}_{3}C{H}_{2}SH+B{r}^{–}$
(b) $(C{H}_3{)}_{2}C=C{H}_2+HCl\to (C{H}_3{)}_{2}ClC–C{H}_3$
(c) $C{H}_{3}C{H}_{2}Br+H{O}^{–}\to C{H}_2=C{H}_2+H_{2}O+B{r}^{–}$
(d) $(C{H}_3{)}_{3}C–C{H}_{2}OH+HBr\to (C{H}_3{)}_{2}CBrC{H}_{2}C{H}_3+H_{2}O$

Q.

Acetic acid dissolved in benzene shows a molecular weight of:

1. 60

2. 120

3. 180

4. 240

Q. 1.84 g mixture of CaCO3 and MgCO3 was heated to a constant weight till 0.96g residue formed %MgCO3 in a sample was

Q.

At 300K, when a solute is added to a solvent its vapour pressure over mercury reduces from 50 mm to 45 mm. The value of mole fraction of solute will be:

1. 0.900
2. 0.010
3. 0.100
4. 0.005

Q.

Is NH an electron withdrawing group?

Q. How we will get to know which compound is more stable

Q.

Why the hydroxyl group in phenols acts as a electron donating group?

Q. A and B in the following reactions are:

1. 
2. 
3. 
4. 

Q.

Sodium Argento cyanide is a ____ salt.

1. Acidic

2. Basic

3. Complex

4. Double

Q. Vitamin C $(M=176)$ is a compound of $C,H,O$ found in many natural sources, especially citrus fruits. When a $1.0\text{g}$ sample of vitamin C is placed in a combustion chamber and burned, the following data is obtained.
$\text{Mass of}C{O}_2\text{absorber after combustion}=83.85\text{g}$
$\text{Mass of}C{O}_2\text{absorber before combustion}=82.35\text{g}$
$\text{Mass of}{H}_{2}O\text{absorber after combustion}=37.96\text{g}$
$\text{Mass of}{H}_{2}O\text{absorber before combustion}=37.55\text{g}$
What is the empirical formula of Vitamin C?

1. $C{H}_{2}O$
2. $CHO$
3. $C_3{H}_4{O}_3$
4. $C_2{H}_{2}O$

Q. Compound A of molecular formula $C_4{H}_{10}O$ on treatment with Lucas reagent at room temperature gives compound B. When compound B is heated with alcoholic $KOH$, it gives isobutene. Compound A and B are respectively:

1. Butan-2-ol and 2-Chlorobutane
2. 2-Methyl-1-propanol and 1-Chloro-2-methylpropane
3. 2-Methyl-1-propanol and 2-Methyl-2-chloropropane
4. 2-Methyl-2-propanol and 2-Methyl-2-chloropropane

Q. The following sequence of reactions on A gives

1. 
2. 
3. 
4. 

Q. The option in which all the groups show electron donating nature when attached to a benzene ring are :

1. $-N{O}_2,-Cl,-OH$
2. $-OMe,-CN,-N{H}_2$
3. $-NHCOC{H}_3,-Cl,-COOH$
4. $-NHCOC{H}_3,-C{H}_3,-Br$

Q. Which of the following is an addition reaction ?

1. $C{H}_4\to C{H}_{3}Cl+HCl$

2. Both (a) and (b)
3. None of these

4. $H_{2}C=C{H}_2+X_2\to H-\stackrel{H}{\stackrel{|}{\underset{H}{\underset{|}{C}}}}-\stackrel{H}{\stackrel{|}{\underset{H}{\underset{|}{C}}}}-X$

Q. 1.For symmetrical alkenes/alkynes , we can add the negative and positive part of the reagent to any of the double/triple bonded carbon atoms.Markovnikovs rule does not apply to such alkenes and alkynes.Is this correct?

Q. $1.00g$ of a non-electrolyte solute dissolved in $50g$ of benzene lowered the freezing point of benzene by $0.40K$. The freezing point depression constant of benzene is $5.12Kkgmo{l}^{-1}$. Find the molar mass of the solute.

Q. Write the name of monomers used for getting the following polymers :

(i) Terylene

(ii) Nylon-6, 6

Q. Among the following, which one is not a meta directing group in an electrophilic attack?

1. 
2. 
3. 
4. 

Q.

Name one industrial application of the addition reaction?

Q. Which of the following is not a p-block element?

1. $N$
2. $Ba$
3. $Se$
4. $Cl$

Q. Which of the following aqueous solutions should have the highest boiling point?

1. $1.0MKN{O}_3$
   
2. $1.0MN{H}_{4}N{O}_3$
   
3. $1.0MNaOH$
   
4. $1.0MN{a}_{2}S{O}_4$
   

Q. The number of moles of C02 molecules formed when 2 mol of benzene is burnt with sufficient oxygen is 1.) 6 2.) 8 3.) 10 4.) 12

Q. Which of the following is an addition reaction ?

1. $H_{2}C=C{H}_2+X_2\to H-\stackrel{H}{\stackrel{|}{\underset{H}{\underset{|}{C}}}}-\stackrel{H}{\stackrel{|}{\underset{H}{\underset{|}{C}}}}-X$

2. $C{H}_4\to C{H}_{3}Cl+HCl$

3. Both (a) and (b)
4. None of these

Q. why alkyl groups are less electron withdrawing than H?