00:01
Okay, so the degree of unsaturation gives an idea about the number of rings and pi bonds present in a molecule.
00:09
And the formula to calculate degree of unsaturation is c minus h over 2 minus x over 2 plus n over 2 plus 1, where c is the number of carbon, h is the number of hydrogens, and x is the number of halogen, and n is the number of nitrogens.
00:27
So the first molecule we have is c4, h4.
00:32
Let us calculate its degree of unsaturation.
00:35
So we have u equals the number of carbon in c4h4 is 4.
00:41
The number of hydrogen is also 4 and the number of halogen is 0.
00:45
The number of nitrogen is also 0.
00:48
So on solving this, the degree of hydrogen of c4h4 we get is 3.
00:53
That is, it may have three double bonds, one triple bond and one single bond, one ring and two double bond.
00:59
Or one ring with a single bond attached with a chain of one double bond.
01:09
So the possible structures are buta -triene...