Question

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The total number of carbon chains that four carbon atoms form in an alkane is -:

a) 5
b) 4
c) 3
d) 2

Answer 1

ANSWER:- 03



STEP-BY-STEP EXPLANATION

Total number of carbon is 4. Also the type of hydrocarbon is ALKANE.
So,
All the bond between the 4 carbon atoms will be single bond.

Also,

The general expression of ALKANES is as follows:-

$c_nh_{(2n + 2)}$

Now,
Molecular formula of 4 carbon atom alkane will be :-

$c_4h_{10}$



The carbon chains that 4 carbon atoms can form are as follows :-

1) Straight Carbon Chain :-

In this all the carbon atoms will be aligned collinear to each other and will have hydrogen atoms attached with them.

The name of this hydrocarbon will be :-

$butane$

Also,

It is popularly known as N - BUTANE


2) Branched Carbon chain :-

In this the longest carbon chain will be of 3 carbon atoms and the 4th carbon atom will be attached to the 2nd carbon atom forming a Branched chain.
The molecular formula will be same as Butane but the IUPAC name will change.

The name of this hydrocarbon will be :

$2 \: methyl \: propane$

Also,

It is popularly known as ISO-BUTANE

This is because it is an Isomer of the hydrocarbon BUTANE.


3) Ring Carbon chain:-

In this all the four carbon atoms are linked with each other forming a closed ring.

The molecular of this compound is also same as BUTANE. The name of this compound is

$cyclobutane$

For the structure of all of these chains please refer the attachments.