Homologous Series

Q.

Name three homologues of aldehyde series.

Q.

Draw formulas for the first five members of each homologous series beginning with the following compounds.

$H-COOH$

$C{H}_{3}COC{H}_3$

$H–CH=C{H}_2$

Q.

Which amongst the following contains a triple bond?

1. ${\mathrm{C}}_2{\mathrm{H}}_3$

2. ${\mathrm{C}}_2{\mathrm{H}}_2$

3. ${\mathrm{C}}_2{\mathrm{H}}_4$

4. ${\mathrm{C}}_3{\mathrm{H}}_4$

Q. The correct combination of names for isomeric alcohols with molecular formula $C_4{H}_{10}O$ is/are:

1. $tert-\text{butanol and 2-methylpropan-2-ol}$
2. $tert-\text{butanol and 1, 1-dimethylethan-1-ol}$
3. $n-\text{butanol and butan-1-ol}$
4. $\text{isobutyl alcohol and 2-methylpropan-1-ol}$

Q. A hydrocarbon of molecular formula c6h14 on monochlorination gives two products . Identify the structure of hydrocarbon

Q. Write any 4 characteristic features of homologous series of organic compounds?

Q.

The general formula of the alkyne is $C_n{H}_{2n+2}$

1. True
2. False

Q.
Product (A) is:

1. 
2. 
3. 
4. 

Q.

Which of the following one is a saturated hydrocarbon?

1. propene

2. propyne

3. ethylene

4. butane

Q. Ethyl alcohol is mainly manufactured by :

1. destructive distillation of wood
2. hydrogenation of $CO$
3. fermentation of sugar
4. catalytic oxidation of ethane

Q.

Assertion (A): Following are the members of a homologous series: CH₃OH, CH₃CH₂OH, CH₃CH₂CH₂OH .

Reason (R): A series of compounds with the same functional group but differing by – CH₂ – unit is called a homologous series.

1. Both (A) and (R) are true and (R) is correct explanation of the assertion

2. Both (A) and (R) are true but (R) is not the correct explanation of the assertion.

3. (A) is true but (R) is false.

4. (A) is false but (R) is true

Q.

Define alkenes. Name the first two members of the series

Q.

In the case homologous series of alkanes, which one of the following statements is incorrect

1. The members of the series are isomers of each other

2. The members of the series have similar chemical properties

3. The members of the series have the general formula $C_{n}H{2}_{n+2}$ where n is an integer

4. The difference between any two successive members of the series corresponds to 14 unit of relative atomic mass

Q. Given

I and II are

1. a pair of conformers
2. a pair of optical isomers
3. a pair of geometrical isomers
4. None of above

Q. What is meant by homologous series of organic compounds? Write the chemical formulae of two members of a homologous series and state which part determines the (i) physical properties, (ii) chemical properties, of these compunds.

Q. $C_n{H}_{2n+2}$ is the general formula of a homologous series of hydrocarbons.
i) Is this series saturated or unsaturated?
ii) Name the series described above. Give the formula and name of the member with two carbon atoms.
iii) Draw the structural formula of the first member of this series.
iv) Define the homologous series and find the common difference between the successive members of this family.
v) Write the formula of n-butane and n-pentane.

Q.

Which of the following do/does not fall under a single homologous series?

1. 1 - Butene

2. 2 - Butyne

3. Propene

4. 2 - Butane

Q. The third member of the homologous series of aliphatic aldehydes has the structure :

1. $C{H}_{3}C{H}_{2}CHO$
2. $C{H}_3(C{H}_2{)}_{2}CHO$
3. $C{H}_{3}COC{H}_{2}C{H}_3$
4. $C{H}_{3}COC{H}_3$

Q. $C_3{H}_6,C_4{H}_8$ and $C_5{H}_{10}$ belong to the same homologous series. Define homologous series.

Q. How many monochlorinated products can be obtained from all the isomeric alkanes having the formula $C_5{H}_{10}$ (excluding stereoisomers)?

1. 16
2. 10
3. 12
4. 14

Q.

Draw the structure for the following compounds

(i) Ethanoic acid (ii) Bromopentane

(Iii) Butanone (iv) Hexanal

Q. Which of the following species is not partial helide ? A)CNO B)RCOO C)OCN D)NNN

Q. An homologue of homologous series with general formula $C_n{H}_{2n}$ is:

1. ethane
2. ethene
3. ethyne
4. ethanol

Q.

Which of the following does not belong to the same homologous series?

(1) $C_4{H}_{10}$ (2) $C_2{H}_6$ (3) $C_3{H}_8$ (4) $C_4{H}_8$

1. 2
2. 3
3. 1
4. 4

Q. (a) How will you convert the following:
(i) Propanone to Propan $-2-ol$
(ii) Ethanal to $2-$hydroxy propanoic acid
(iii) Toluene to benzoic acid
(b) Given simple chemical test to distinguish between:
(i) Pentan-$2$-one and $Pentan-3-one$
(ii) Ethanal and Propanal

Q. Why homologous series of carbon compounds are so called? Write chemical formula of two consecutive members of a homologous series and state the part of these compounds that determines their (i) physical properties, and (ii) chemical properties?

Q. Which of the following pairs of homologous series is represented by the general molecular formula $C_n{H}_{2n-2}$ ?

1. Alkene and alkyne
2. Alkyne and alkadiyne
3. Alkane and alkadiene
4. Alkyne and alkadiene

Q. A molecular formula of cyclo-hydrocarbon is similar as the molecular formula of:

1. alkane
2. alkene
3. alkyne
4. none of these

Q. What are homologous series of carbon compounds? Write the molecular formula of two consecutive members of homologous series of aldehydes. State which part of these compounds determines their (i) physical and (ii) chemical properties.

Q. Write the name and formula of the $2^{nd}$ member of the series of carbon compounds whose general formula is $C_n{H}_{2n+1}OH$.