why in second part i.e. C5H6Br2 there is addition sign inside bracket but in other minus sign

Dear Students,

To calculate the unsaturation formula, firstly, we have to know the molecular formula of the molecule. In this way, we can apply the general formula is:

Degrees of unsaturation=2C+2+N–H–X/2
So as in (I) there is nitrogen whereas in (ii) there is bromine so as per the formula we have to do so there is plus of nitrogen number and minus for halogen number.
Hope this will help to make different uses of the formula as per the compound.
Regards,
 


 

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