The structural formula of some organic compounds are given below:

(i) ${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{CO}-{\mathrm{CH}}_3$

(ii) ${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\mathrm{CHO}$

(iii) ${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\mathrm{OH}$

(iv) ${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{CH}}_3$

a. Which of these is an alkane?
b. Write the structural formula of the position isomer of the third compound.
c. Which of the given compounds are functional isomers?
d. Write the structural formula of the chain isomer of the fourth compound.

The structure of a hydrocarbon is given below:

(a) How many C- atoms are there in the main chain? Which is the word root? 
(b) Identify the branch and its position number? 
(c) Write the IUPAC name of this compound. 

The structure of two organic compounds are given below:

(a) Write the molecular formula of these compounds. 
(b) Which type of isomerism do they exhibit? 
(c) Explain the isomerism. 
(d) Write the position isomer of butanol.

Select the structural formula of the given compound from the box.

But-1-yne.

The structural formula of a hydrocarbon is given below.

How many carbons are there in the main chain?

The structural formula of a hydrocarbon is given below.

Identify the position number of branches.

The structural formula of a hydrocarbon is given below.

Write the IUPAC name of this compound.

Some information about an organic compound is given:

(i) it has three carbon atoms in its main chain.

(ii) It has a hydroxyl group $(-\mathrm{OH})$ attached to its second carbon atom.

Write the structural formula of this compound.