А - CH3-CH(CH3)CH2-CH3
B - CH3-C(CH3)-CH2-CH3
⇵
Br
C - CH3-C(CH3)=CH-CH3
Объяснение:1) CH3-CH(CH3)CH2-CH3 + Br₂(hv) → CH3-(Br)C(CH3)-CH2-CH3 + HBr
2) CH3-(Br)C(CH3)-CH2-CH3 + Na(OH)(спирт.) → CH3-(CH3)C=CH-CH3 + NaBr + H₂O
3) 3CH3-C(CH3)=CH-CH3 + 2KMnO4 + 3H₂O → 3CH3-(CH3)C(OH)-CH(OH)-CH3 + 2MnO2 + 2KOH
Ch3 + CBr2 -CH2 -CH3 + 2KOH(спірт) = СH3 - С≡C - CH3 + 2KCl + 2H2O
CH3 - Ch2 - Ch2 - Ch3 = CH3 - C≡C - CH3 + 2H2