To obtain cyclopropane from propylene and the corresponding reagents.

CH2 – propylene.
C3H6 – cyclopropane.
С3H6Cl2 + LiAlH4 = C3H8 (propane)
C3H8 – (catalyst) -> CH3-CH = CH2 (propylene)
CH3-CH = CH2 + HBr -> CH3-CHBr-CH3
CH3-CH2-CH3 + Br2 -> BrCH2CH2CH2Br – (Zn) -> C3H6 (cyclopropane)
CH3-CH = CH2 – (catalyst) -> [CH (CH3) -CH2] n polypropylene

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