Which is composed of alkynes? acetylene margarine rubber tires polystyrene cups

option A acetylene

Explanation: since alkynes are those which have triple bond between carbon atoms with general molecular formula CnH2n-2.

Here acetylene has molecular formula C2H2 which satisfies the alkyne general formula.

Hence A is correct

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer