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. - Science

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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.

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Solution

Molecular formula of two consecutive members of homologous series of aldehydes:-

CH3-CHO and CH3-CH2-CHO

In CH3-CHO compound, -CHO part and in CH3-CH2-CHO, -CH2-CHO part will determine their physical and chemical properties.

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2013-2014 (March) All India Set 1

RELATED QUESTIONS

What is a homologous series?


State any four characteristics of a homologous series


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


Write the molecular formula of first two members of homologous series having functional group – OH


Complete the following table which relates to the homologous series of hydrocarbons.

General

Formula

IUPAC name of the homologous series Characteristic bond type IUPAC name of the first member of the series
`C_nH_(2n-2)` (A)________ (B)______ (C)______
C_nH_(2n+1) (B)________ (E)______ (F)______

What is the difference between two consecutive homologues:
(1) in terms of molecular mass?
(2) in terms of number and kind of atoms per molecule?


Give the molecular formula of one homologue of the following:

C3H6

 


Write the molecular formula of the third member of the homologous series of carbon compounds with general formula CnHO2n+1OH.


Fill in the blank: 

Propane and ethane are ____________ 


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


What is homologous series ?


What is the difference in the molecular formula of any two adjacent homologues in terms of number and kind of atoms per molecule ?

Write the name and molecular formula of the first member of the homologous series of alkynes.


Distinguish between homologous organs and analogous organs. In which category would you place wings of a bird and wings of a bat? Justify your answer giving a suitable reason.


Write names of first four homologous series of alcohols


Give the names of the first four members of the homologous series of
alkynes.


Copy and complete the following table which relates to three homologus series of hydrocarbons:

General formula CnH2n CnH2n-2 CnH2n+2
IUPAC name of the homologus series      
Characteristic bond type     Single bond
IUPAC name of the first member of the series      
Type of reaction with chlorine   Addition  

What is a Homologous series?


What is the difference in the molecular formula of any two adjacent homologues:

(i) In terms of molecular mass

(ii) In terms of number and kind of atoms per molecule?


The general formula of Alkane is _________________


Complete the correlation:

Alkene : C = C :: Alkyne: _______.


The unsaturated hydrocarbons containing a carbon-carbon double bond are called _______.


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 _______.


Cyclohexane : Cyclic hydrocarbon : : Isobutylene : _______


Saturated hydrocarbon : Single bond : : Unsaturated hydrocarbon : _______


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 homologous series of alcohols.

Name Molecular formula Condensed structural formula Number of carbon atom Number of -CH2- units Boiling point °C
Methanol CH4O CH3-OH 1 1 63
Ethanol C2H6O CH3–CH2-OH 2 2 78
Propanol C3H8O CH3–CH2–CH2-OH ______ ______ 97
Butanol C4H10O CH3–CH2–CH2–CH2–OH ______ ______ 118

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?


Name the following organic compound:

The first homologue whose general formula is CnH2n.


Define Homologous series.


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 C3H6.
  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.

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.

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