MCQ
Which of the following is a hydrocarbon
- AUrea
- ✓Benzene
- CAmmonium cyanate
- DPhenol
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(Assume: Momentum is conserved when photon is absorbed. Use: Planck constant $=6.6 \times 10^{-34} J s$, Avogadro number $=6 \times 10^{23} mol ^{-1}$, Molar mass of $He =4 g mol ^{-1}$ )

| List$-I$ Name of oxo acid | List$-II$ Oxidation state of $P$ |
| $(a)$ Hypo phosphorous acid | $(i) +5$ |
| $(b)$ Orthophosphoric acid | $(ii)+4$ |
| $(c)$ Hypo phosphoric acid | $(iii) +3$ |
| $(d)$ Orth phosphorous acid | $(iv)+2$ |
| $(v)+1$ |
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