9.
两种气态烃组成的混合气体,完全燃烧后得到\(\rm{CO_{2}}\)和\(\rm{H_{2}O}\)的物质的量随着混合烃物质的量的变化如图所示,则下列对混合烃的判断正确的是\(\rm{(}\) \(\rm{)}\)
\(\rm{①}\)一定有\(\rm{C}\)\(\rm{{\,\!}_{2}}\)\(\rm{H}\)\(\rm{{\,\!}_{4}}\)
\(\rm{②}\)一定有\(\rm{CH}\)\(\rm{{\,\!}_{4}}\)
\(\rm{③}\)一定有\(\rm{C}\)\(\rm{{\,\!}_{3}}\)\(\rm{H}\)\(\rm{{\,\!}_{8}}\)
\(\rm{④}\)一定无\(\rm{C}\)\(\rm{{\,\!}_{2}}\)\(\rm{H}\)\(\rm{{\,\!}_{6}}\)
\(\rm{⑤}\)可能有\(\rm{C}\)\(\rm{{\,\!}_{2}}\)\(\rm{H}\)\(\rm{{\,\!}_{6}}\)
\(\rm{⑥}\)可能有\(\rm{C}\)\(\rm{{\,\!}_{2}}\)\(\rm{H}\)\(\rm{{\,\!}_{2}}\)