Advertisements
Advertisements
प्रश्न
Define homologous series of organic compounds. List its two characteristics. Write the name and formula of the first member of the series of alkenes.
Advertisements
उत्तर
A homologous series is a series of carbon compounds that have different number of carbon atoms but contain the same functional group.
For example, methane, ethane, propane, butane, etc. are all part of the alkane homologous series.
Methane CH4
Ethane CH3CH3
Propane CH3CH2CH3
Butane CH3CH2CH2CH3
There is a difference of −CH2 unit between each successive compound.
Characteristics of homologous series:
All the members of the homologous series have same functional groups and hence similar chemical properties.
Two successive members of a homologous series differ by a −CH2 unit and 14u.
The first member of the series of alkenes in ethene. Its formula is C2H4.
APPEARS IN
संबंधित प्रश्न
Write the name and formula of the 2nd member of homologous series having general formula CnH2n.
The following vegetables are kept in a basket :
Potato, Tomato, Radish, Brinjal, Carrot, Bottle-gourd
Which two of these vegetables correctly represent the homologous structures?
(A) Carrot and Tomato
(B) Potato and Brinjal
(C) Radish and Carrot
(D) Radish and Bottle-gourd
Write the molecular formula of the third member of the homologous series of carbon compounds with general formula CnHO2n+1OH.
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
Give three points to differentiate between saturated and unsaturated
hydrocarbons.
Complete the correlation:
Alkene : C = C :: Alkyne: _______.
While going in an increasing order there is a rise in the molecular mass of the consecutive members of the homologous series by _______.
Saturated hydrocarbon : Single bond : : Unsaturated hydrocarbon : _______
As one ascends in any homologous series, physical properties change gradually.
Write a short note.
Homologous series
