Identify the final product obtained when a mixture of vapours of phenol and hydrogen is passed over nickel catalyst at $433 \ K$.
- ACyclohexanol
- BCyclohex-$2$-en-$1$-ol
- CCyclohexane
- DBenzene
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The increasing order of $pKa$ values of the following compounds is:
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| Acid | $pK_a$ |
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| $(iv)$ Picric acid | $d. 0.78$ |
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