Lithium reducing agent, acting

Oo In a combination reaction, does metallic lithium act as an oxidizing agent or a reducing agent Explain. 

Lithium aluminium hydride (LiAlH4), a strong reducing agent, reduces alkyl halides to alkanes. Essentially, a hydride ion (H ) acts as a nucleophile displacing the halide. A combination of metal and acid, usually Zn with acetic acid (AcOH), can also he used to reduce alkyl halides to alkanes. 

SnH4) A colorless poisonous gas prepared by the action of lithium tetrahydroalumi-nate(IIl) on tin(ll) chloride. It is unstable, decomposing immediately at 150°C. Stannane acts as a reducing agent. 

PTEE is unique in its corrosion resistance properties. It is virtually inert in the presence of most materials. There are very few chemicals that will attack PTEE at normal use temperatures. Among materials that will attack PTFE are the most violent oxidizing and reducing agents known. Elemental sodium removes fluorine from the molecule. The other alkali metals (potassium, lithium, etc.) act in a similar manner. 

Tropylium salts are also reduced to cycloheptatriene by means of lithium aluminiijm hydride or sodium borohydride. [53,21]. Some alcohols also act as reducing agents, e.g. [54,55]... 

Acetals are extremely useful compounds in synthesis because they can act as protecting groups for aldehydes and ketones. Acetals are less reactive than carbonyl compounds to nucleophiles and reducing agents, such as lithium aluminium hydride (LiAlH4). 

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