Physical Properties

Q. The C - Cl bond length in chlorobenzene is shorter than that in $C{H}_3-Cl$ because

1. Cl is attached to $s{p}^3$ hybridised C atom in $C{H}_3-Cl$ and attached to $s{p}^2$ hybridised C atom in chlorobenzene
2. Cl is attached to $s{p}^2$ hybridised C atom in $C{H}_3-Cl$ and attached to $s{p}^2$ hybridised C atom in chlorobenzene
3. Cl is attached to $s{p}^2$ hybridised C atom in $C{H}_3-Cl$ and attached to $s{p}^3$ hybridised C atom in chlorobenzene
4. Cl is attached to $s{p}^3$ hybridised C atom in $C{H}_3-Cl$ and attached to $s{p}^3$ hybridised C atom in chlorobenzene

Q. 26. Concentrated nitric acid used as a laboratory reagent is usually 69%by mass of nitric acid . Calculate the volume of the solution which contained 23 g of nitric acid . Density of conc. nitric acid is 1.41 g/cm3.

Q.

How would you name the following compounds? (i) ${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{Br}$ (ii) $\mathrm{H}-\mathrm{CHO}$ (ii) ${\mathrm{CH}}_3-{\left({\mathrm{CH}}_2\right)}_3-\mathrm{CH}={\mathrm{CH}}_2$

1. (i) Bromomethane (ii) Methanol (iii) Hexene

2. (i) Bromoethane (ii) Ethanol (iii) Hexene

3. (i) Bromopropane (ii) Methanol (iii) Hexene

4. (i) Bromoethane (ii) Methanal (iii) Hexene

Q.

Although haloalkane are polar in nature, Yet they are slightly soluble in water. Which characteristic behavior is responsible for such kind of property?

1. Attraction between halogen and water is less then the attraction between original water molecules

2. Attraction between halogen and water is morethen the attraction between original water molecules

3. Attraction between halogen and water is same as the attraction between original water molecules

4. Attraction between halogen and water is totally absent

Q.

Pure water boils at 373 k and pure nitric acid boils at 359 K the azeotropic mixture of water and nitric acid boils at T K. T=??

Q. The equivalent mass of KCl.MgCl2.6H2O is (M = Molar mass of salt) (1) M (2) M/6 (3) M/2 (4) M/3

Q.

Arrange each set of compounds in order of increasing boiling points.

(i) Bromomethane, Bromoform, Chloromethane, Dibromomethane.

(ii) 1-Chloropropane, Isopropyl chloride, 1-Chlorobutane.

Q. Arrange in increasing order of basic strength giving reason: C2H5NH2, C6H5NH2, (C2H5)2NH

Q.

The correct order of ${\mathrm{K}}_{\mathrm{b}}$ value of the following is

1. 1 > 2 > 3

2. 1 > 3 > 2

3. 3 > 2 > 1

4. 3 > 1 > 2

Q.

Why are amides weaker bases than amines?

Q. Higher boiling point of water over hydrogen sulphide is due to:

1. Dipole - induced dipole interactions
2. Dispersion forces
3. Hydrogen bonding interactions
4. None of the above

Q. Calculate the mass of 6.002 ×10^23 molecules of NH4cl

Q. Lower alcohols are highly soluble in water due to__.

1. Van der Waal's interaction
2. Dipole dipole interaction
3. Steric hindrance
4. Hydrogen bonding

Q. The given structure of amino acid will exist at which pH?

1. 7
2. 14
3. 2-3
4. 12

Q.

Give plausible explanation for each of the following:

Why do primary amines have higher boiling point that tertiary amines?

Q.

Which of the following statement is not true for halogens

1)chlorine has highest electron gain enthalphy

2)all forms monobasic oxyacids

3)all but flourine shows positive oxidation states

4)all are oxidising agents

Q.

The molecules having dipole moments are __________.

1. $2,2,3,3–Tetramethylbutane$
   
2. $2,2-Dimethylpropane$
3. $cis-Hex-3-ene$
   
4. $trans-Pent-2-ene$
   

Q.

Why do amines have higher boiling point than hydrocarbons?

Q. Why is p toluidine more basic than m toluidine?

Q. Solubility of amines in water with increase in molecular mass due to size of the hydrophobic part.

1. increases
2. decreases
3. smaller
4. higher

Q. Given below are two statements:
Statement I: o-Nitrophenol is steam volatile due to intramolecular hydrogen bonding.
Statement II: o-Nitrophenol has high melting point due to hydrogen bonding.
In the light of the above statements, choose
the most appropriate answer from the
options given below:

1. Both statement I and statement II are true
2. Statement I is false but statement II is true
3. Statement I is true but statement II is false
4. Both statement I and statement II are false

Q.

The order of basic strength among the following amines in benzene will be

1. CH₃NH₂ > (CH₃)₃ N > (CH₃)₂ NH

2. (CH₃)₃ N > (CH₃)₂ NH > CH₃ NH₂

3. CH₃ NH₂ > (CH₃)₂ NH > (CH₃)₃ N

4. (CH₃)₂ NH > CH₃ NH₂ > (CH₃)₃ N

Q. What is the formula of tertiary butyl alcohol?

1. $C{H}_3-CH\left(C{H}_3\right)-C{H}_2-OH$
2. $C{H}_3-(C{H}_2{)}_{2}OH$
3. $C{H}_3-CH\left(OH\right)-C{H}_2-C{H}_3$
4. $(C{H}_3{)}_{3}C-OH$

Q.

Reactivity of alkyl halides towards SN₁ nucleophilic substitution reaction is:

1. 3^o > 2^o > 1^o

2. 3^o < 1^o < 2^o

3. 3^o < 2^o < 1^o

4. 2^o < 1^o < 3^o

Q. (a) Write the structures of main products when benzene diazonium chloride $\left(C_6{H}_5{N}_2^{+}C{l}^{-}\right)$ reacts with the following reagents :
(i) $CuCN/KCN$
$\left(ii\right)H_{2}O$
$\left(iii\right)C{H}_{3}C{H}_{2}OH$

(b) Arrange the following:
$\left(i\right)C_2{H}_{5}N{H}_2,C_2{H}_{5}OH,(C{H}_3{)}_{3}N$ - in the increasing order of their boiling point.
(ii) Aniline, p-nitroaniline, p-methylaniline - in the increasing order of their basic strength.

Q. The decreasing order of boiling points of alkyl halides is

1. RI > RBr > RCl > RF
2. RF > RCl > RBr > RI
3. RBr > RCl > RI > RF
4. RCl > RF > RI > RBr

Q.

Is ammonia more dense or less dense than air?

Q.

The correct order of basic strength of the following is

1. p - chloroaniline> p - methoxy aniline > p - nitro aniline
2. p - methoxy aniline > p - nitro aniline > p - chloroaniline
3. p - chloroaniline> p - nitro aniline > p - methoxy aniline
4. p - methoxy aniline > p - chloroaniline> p - nitro aniline

Q. Which of the following is a secondary alcohol?

1. Butan-2-ol
2. 2-Methylpropan-2-ol
3. 2-Methylpentan-2-ol
4. All of the above

Q. compare masses of pure NaOH in each of the aqueous solution 1)50g of 40%(w/w)NaOH 2) 50mL of 50% (w/v) NaOH (d=1.25/mL)