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  4. The IUPAC name of the compound CNCH2CHCNCH2CN is

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Q. The IUPAC name of the compound $ CNC{{H}_{2}}CHCNC{{H}_{2}}CN $ is

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Solution:

$ \underset{CN}{\mathop{\underset{|}{\mathop{C{{H}_{2}}}}\,}}\,-\underset{CN}{\mathop{\underset{|}{\mathop{CH}}\,}}\,-\underset{CN}{\mathop{\underset{|}{\mathop{C{{H}_{2}}}}\,}}\, $ IUPAC name 1,2.3-tricyanopropane According to modern recommendations, if there are more than two same functional groups in a compound, they are not included in the root chain.