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CBSE Class 10 Answered

http://www.topperlearning.com/forums/ask-experts-19/is-the-answer-for-the-1st-one-correct-chemistry-carbon-and-its-compounds-100322/reply
 
in the above query the heteroatom bromine should only be considered as functional group and should be given the least number, why in the case the double bond is given the least number??
i can`t understand. pls explain
Asked by my3shyll | 15 Feb, 2017, 07:51: PM
answered-by-expert Expert Answer

The order of preference of functional groups is as follows:

−SO3H>−COOH>−COOR>−COX>−COCl>−CONH2>−CHO>−CN>>C=O>−OH>−SH>−NH2>C=C>−C≡C−>−NO2>−NO>−X

Answered by Vaibhav Chavan | 16 Feb, 2017, 11:03: AM
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