The table lists the molecular formulae for three molecules, P, Q and R. None of these molecules is cyclic. P: CH$_4$O Q: CH$_2$O$_2$ R: CH$_2$O Which of these molecules has a strong absorption in the region from $1610\ \text{cm}^{-1}$ to $1750\ \text{cm}^{-1}$ in its infra-red spectra?
- AQ only
- BR only
- CQ and R only
- DP, Q and R