Write the next homologue of the following: C2H4 - Science


Write the next homologue of the following: C2H4



C2H4 is an alkene consisting of two carbon atoms. Its next  homologue is obtained by adding a −CH2− unit. Thus, the next homologue is propene (C3H6).

  Is there an error in this question or solution?
2015-2016 (March) Delhi Set 1


What is a homologous series?

State any four characteristics of a homologous series

Write the next homologue of the following: C4H6

Write the name and formula of the 2nd member of homologous series having general formula CnH2n + 2.

Give the structural formula for 1, 2-dichloroethane

What is the next higher homologue of methanol (CH3OH)?

The molecular formula of an organic compound is C18H36. Name its homologous series.

Fill in the blank: 

Propane and ethane are ____________ 

Fill in the blank: 

Succeeding members of a homologous series differ by ______________ 

Give the :  abbreviated formula of the third member of the alcohol

What is homologous series ?

Study the different conclusions drawn by students of a class on the basis of observations of preserved/available specimens of plants and animals.

I. Potato and sweet potato are analogous organs in plants.

II. Wings of insects and wings of birds are homologous organs in animals.

III. Wings of insects and wings of bats are analogous organs in animals.

IV. Thorns of citrus and tendrils of cucurbita are analogous organs in plants.

The correct conclusions are:

(A) I, and II

(B) II and IV

(C) I and III

(D) III and IV

Write names of first four homologous series of alcohols

Give three points to differentiate between saturated and unsaturated

Write the name and formula of the fourth member of the following homologous series:

  1. Alkyne
  2. Alcohol

The general formula of Alkane is _________________

Complete the correlation:

Alkene : C = C :: Alkyne: _______.

The phenomenon in which compounds having different structural formulae have the same molecular formula is called _______.

While going in an increasing order there is a rise in the molecular mass of the consecutive members of the homologous series by _______.

The general molecular formula for the homologous series of alkynes is _______.

Cyclohexane : Cyclic hydrocarbon : : Isobutylene : _______

Find the odd one out and give its explanation.

As one ascends in any homologous series, physical properties change gradually.

Write a short note.

Homologous series

Complete the following table for the homologous series of alkanes.

Name Molecular formula Condensed structural formula Number of carbon atom Number of -CH2- units Boiling point °C
Methane CH4 CH4 1 1 -162
Ethane C2H6 CH3–CH3 2 2 -88.5
Propane C3H8 CH3–CH2–CH3 3 3 -42
Butane C4H10 CH3–CH2–CH2–CH3 ______ ______ 0
Pentane C5H12 CH3–CH2–CH2–CH2–CH3 ______ ______ 36
Hexane C6H14 CH3–CH2–CH2–CH2–CH2–CH3 ______ ______ 69

Complete the following table for homologous series of Alkenes.

Name Molecular formula Condensed structural formula Number of carbon atom Number of -CH2- units Boiling point °C
Ethene C2H4 CH2 = CH2 2 0 -102
Propene C3H6 CH3–CH = CH2 3 1 -48
1-Butene C4H8 CH3–CH2–CH = CH2 ______ ______ -6.5
1-Pentene C5H10 CH3–CH2–CH2–CH = CH2 ______ ______ 30

Observe the structural formula and answer the following questions.

  1. Write the name of the given hydrocarbon.
  2. The given hydrocarbon is included in which type of hydrocarbon?
  3. What is the kind of compounds with the above characteristic structure called?

Complete the following chart by using examples given in brackets.

(isobutylene, cyclohexane, propane, cyclohexene, cyclopentane, benzene, propyne, isobutane, propene)

Straight chain hydrocarbons Branched chain hydrocarbons Cyclic hydrocarbons

Which of the following pairs can be the successive members of a homologous series?

What is called homologous series? Give any three of its characteristics?

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

The first member of alkyne homologous series is

Name the following organic compound:

The first homologue whose general formula is CnH2n.

Study and complete the following table:

Homologous series Alkane Alkyne
General formula CnH2n+2 1. ______
IUPAC name 2. ______ Ethyne
Common name Marsh gas 3. ______

Define Homologous series.

Consider the following molecular formulae of carbon compounds:

(i) CH3COOH (ii) CH3OH (iii) C2H6 (iv) C3H4 (v) C4H

  1. Which one of these compounds belongs to homologous series of alcohols?
  2. Identify the compound having triple bond between carbon-carbon atoms.
  3. Write the molecular formula of the first member of the homologous series to which CH3COOH belongs.
  4. Write the general formula of the series to which the compound C4H8 belongs.

Consider the carbon compounds having following molecular formula:

(i) C3H6 (ii) C3H8 (iii) C4H6 (iv) C6H6 (v) C6H12

  1. State the number of double covalent bonds present in C3H8.
  2. Write the formula of first member of the homologous series to which the carbon compound C4H6 belongs.
  3. Which one of the above compounds forms a ring structure of carbon atoms?
  4. Identify, which of the above compounds, is a member of alkane series.

Name the following:

Group of organic compounds where the successive members follow a regular structural pattern, successive compounds differ by a 'CH2' group.


      Forgot password?
Use app×