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  4. RCH=CH2 xrightarrow[C2H5OH]Na/NH3(l)RCH2CH3 , This reaction is called as:

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Q. $ RCH=C{{H}_{2}}\xrightarrow[{{C}_{2}}{{H}_{5}}OH]{Na/N{{H}_{3}}_{(l)}}RC{{H}_{2}}C{{H}_{3}} $ , This reaction is called as:

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Solution:

$ \underset{Terninal\,alkene}{\mathop{R-CH=C{{H}_{2}}}}\,\xrightarrow[ethanol]{Na/liq\,N{{H}_{3}}} $ $ \underset{Alkane}{\mathop{R-C{{H}_{2}}-C{{H}_{3}}}}\, $ A terminal olefinic bond may be reduced by sodium in-liquid NH3 in the presence of ethanol to give alkane. This reaction is known as Birch reduction.