English Medium Class 10 - CBSE Question Bank Solutions

Give the molecular formula of one homologue of the following:

C₃H₆

Give the molecular formula of one homologue of the following:

C₂H₆

Write the names and formulae for the first three members of the homologous series of chloroalkanes.

Give the name and structural formula of one homologue of the following:

CH₃OH

Write the molecular formula of the third member of the homologous series of carbon compounds with general formula C_nН_2n+1OН.

What is a homologous series? Explain with an example.

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

The molecular formula of a homologue of butane is ______.

The number of carbon atoms present in the molecule of fifth member of the homologous series of alkynes is ______.

The molecular formula of the third member of the homologous series of ketones is:
(a) C₄H₈O
(b) C₃H₆O
(c) C₅H₁₀O
(d) C₆H₁₂O

An organic compound having the molecular formula C₃H₆O can exist in the form of two isomers A and B having different functional groups. The isomer A is a liquid which is used as a solvent for nail polish. The isomer B is also a liquid. An aqueous solution of one of the lower homologues of B is used for preserving biological specimens in the laboratory
(a) What is compound A?
(b) Write the electron-dot structure of A.
(c) What is compound B?
(d) Write the electron-dot structure of B.
(e) Name the lower homologue of compound B  which is used in preserving biological specimens.

A colourless organic liquid X of molecular formula C₂H₄O₂ turns blue litmus to red. Another colourless organic liquid Y of molecular formula C₃H₆O has no action on any litmus but it is used as a nail polish remover. A yet another colourless organic liquid Z of molecular formula C₂H₆O has also no action on litmus but it is used in tincture of iodine.

(a) Name the liquid X. To which homologous series does it belong? Give the name of another member of this homologous series.
(b) Name the liquid Y. To which homologous series does it belong? Write the name of another member of this homologous series.
(c) Can you name an organic compound having the same molecular formula as liquid Y but which belongs to a different homologous series? What is this homologous series?
(d) Name the liquid Z. To which homologous series does it belong? Write the name of another member of this homologous series.

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

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.

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

Define homologous series of organic compounds. List its two characteristics. Write the name and formula of the first member of the series of alkenes.

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.

Solve the following question:
In an electric circuit, two resistors of 12 0 each are joined in parallel to a 6 V battery. Find the current drawn from the battery.