Melting and Boiling Points

Q.

Which of the following orders regarding the boiling points of the given alkyl chloride is correct?

1. CH₃(CH₂)₃ Cl > CH₃CH₂ CHClCH₃ < (CH₃)₃ CCl

2. CH₃(CH₂)₃ Cl > CH₃CH₂CHClCH₃ > (CH₃)₃ CCl

3. CH₃(CH₂)₃ Cl < CH₃CH₂ CHClCH₃ < (CH₃)₃ CCl

4. CH₃(CH₃)₃ Cl < CH₃CH₂ CHClCH₃ > (CH₃)₃ CCl

Q. Arrange the following compounds in increasing order of their boiling points.
I. $C{H}_{3}C{H}_{2}C{H}_{2}Br$
II. $C{H}_{3}C{H}_{2}C{H}_{2}C{H}_{2}Br$
III.$(C{H}_3{)}_{2}CHC{H}_{2}Br$
IV. $(C{H}_3{)}_{3}CBr$

1. IV < III < II < I
2. I < IV < III < II
3. III < I < IV < II
4. II < I < III < IV

Q.

Assertion : Alkyl halides are soluble in organic solvents.
Reason : p-dichlorobenzene possesses low melting point.

1. If both assertion and reason are true and the reason is the correct explanation of the assertion.

2. If both assertion and reason are true but reason is not the correct explanation of the assertion.

3. If assertion is true but reason is false.
4. If the assertion and reason both are false.

5. If assertion is false but reason is true.

Q. Which of the following isomer has the highest melting point?

1. o-Dichlorobenzene
2. p-Dichlorobenzene
3. m-Dichlorobenzene
4. All have the same melting point

Q. Arrange the following in increasing order of their boiling points.

1. ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{Br}$
2. ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{Br}$
3. $({\mathrm{CH}}_3{)}_2{\mathrm{CHCH}}_2\mathrm{Br}$
4. $({\mathrm{CH}}_3{)}_3\mathrm{CBr}$

Q. Which of the following substrates will give a racemised product?

1. 
2. 
3. 
4. 

Q.

p - dichlorobenzene has higher melting point and lower solubility than those of o - and m-isomers. Discuss. ?

Q.

Which is the correct increasing order of boiling points of the following compounds?

1-iodobutane , 1-bromobutane, 1-chlorobutane, Butane

(a) Butane < 1-chlorobutane < 1-bromobutane < 1-iodobutane

(b) 1-iodobutane < 1-bromobutane < 1-chlorobutane < Butane

(c) Butane < 1-iodobutane < 1-bromobutane < 1-chlorobutane

(d) Butane < 1-chlorobutane < 1-iodobutane < 1-bromobutane

Q.

Which is the correct increasing order of boiling points of the following compounds?

1-bromoethane, 1-bromopropane , 1-bromobutane, Bromobenzene

(a) Bromobenzene < 1-bromobutane < 1-bromopropane < 1-bromoethane

(b) Bromobenzene < 1-bromoethane < 1-bromopropane < 1-bromobutane

(c) 1- bromopropane <1-bromobutane < 1- bromoethane < Bromobenzene

(d) 1-bromoethane < 1-bromopropane < 1-bromobutane < Bromobenze

Q. Ortho, meta & para forms of dihalo benzenes are taken in a single container at $-{25}^0$C. The container is slowly heated up to room temperature and after some time it was found that the container was left with a liquid having some solid residues in it. Solid residue can be:

1. ortho form
2. meta form
3. para form
4. mixture of ortho, meta and para form