Consider the possible vibration modes in the following linear molecules: (a) CO2(O−C−O)\begin{array}{lll}\text { (a) } \mathrm{CO}_ {2} & (\mathrm{O}-\mathrm{C}-\mathrm{O})\end{array} (a) CO2(O−C−O) (b) C2H2(H−C−C−H)\begin{array}{llll}\text { (b) } & \mathrm{C}_ {2} \mathrm{H}_ {2} & (\mathrm{H}-\mathrm{C}-\mathrm{C}-\mathrm{H})\end{array} (b) C2H2(H−C−C−H)
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