When a reddish-brown bromine solution (the solvent is often carbon tetrachloride

Question

When a reddish-brown bromine solution (the solvent is often carbon tetrachloride) is added to the alkene shown below, the brown color of the bromine solution disappears. This reaction is used as a test reaction for double and triple bonds. Aromatic compounds such as benzene do not react. Remember that this is a stereospecific reaction in which the bromines add on opposite faces of the bond. Write the name of the product for the reaction shown above. Include cis or trans in your name. (e.g. cis-2-butene) http://i45.tinypic.com/2cpp9oh.gif hint: Check the numbering in your answer. You want the total lowest number (1+2+3+3=9). Try re-numbering the ring to give a smaller total number. The bromines will add trans-

Explanation / Answer

when bromine is added to 2,2 di chloro pentene(shown in image) , bromine reacts and saturates the alkene to an alkane and forms strong SIGMA bonds " di bromo 2,2 di chloro pentane assuming it is a hydrocarbon it forms C5H6Br2Cl2 C5H8 +Cl2 --------> C5H6Cl2 +HCl C5H6Cl2 +Br2 --------->C5H6Br2Cl2 this test is used to test wthr* a substance is alkene/alkyne or alkane know as bromine water test

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