50. The decreasing order of calorific values is
(2) CH = CH 2 CHỊ > C4Hyo
(1) CH - CHU - CHỊCH
(3) CH. > CsHe > C Ho > C,H, (4) CHg > CHa > Catio > C2Hz
he
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cdf the 2t7wwh the the same time, and a half hours of gwf245
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