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In comparision to Clemmensen reduction, both $\ce{Na-Hg}$ and $\ce{Al-Hg}$ cannot be used as direct substitutes for $\ce{Zn-Hg}$. Reaction with $\ce{Na-Hg}$ amalgam: $\ce{Na-Hg}$ amalgam is also a good reducing agent and is capable of reducing ketones/aldehydes to alcohols1. However, Do not use conc. $\ce{HCl}$ with $\ce{Na-Hg}$ amalgam, as there would be a ...

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The correct question (taken from the 2016 JEE Paper is): Lithium Aluminium Hydride reduces epoxides1, hence (A) would not give the required product. LAH also reduces ethers to primary alcohols, which is an easier way of eliminating the option (A). $\ce{BH3}$ in THF can reduce the acid, as explained in this question, hence the requisite product would not be ...

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The inversion takes place at a single carbon inbetween, so 2^1 = 2. Knowing that the mechanism takes place at the carbonyl carbon, the inversion takes place at one point only. It will not form several stereoisomers, only two at the reaction centre.

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The only case I know of where activated carbon causes reduction at room temperature would be filtration of ozone, $\ce{O3}$. Even fluorine will not oxidize plain carbon: Carbon is stable in a fluorine atmosphere up to about $\pu{400 ^\circ C}$ . Oh, well perhaps dioxygen difluoride, $\ce{FOOF}$, could also oxidize carbon (or could be reduced by carbon, ...

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