Q.Write short notes on the following:

Clemmensen reduction converts an aldehyde or ketone's C=O group completely to CH2 using zinc amalgam and concentrated hydrochloric acid.

In the Clemmensen reduction, the carbonyl compound (aldehyde or ketone) is refluxed with zinc amalgam (Zn-Hg) and concentrated HCl:

R2C=O --(Zn-Hg / conc. HCl)--> R2CH2

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Clemmensen reduction is the reagent combination Zn-Hg (zinc amalgam) with concentrated HCl, used to reduce an aldehyde or ketone's C=O group all the way to CH2 (a strongly acidic reduction, unsuitable for acid-sensitive substrates).

R2C=O --(Zn-Hg / conc. HCl)--> R2CH2 + H2O

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Zn-Hg amalgam with concentrated HCl is the Clemmensen reduction, which converts an aldehyde/ketone carbonyl (C=O) all the way to CH2, i.e. a hydrocarbon.

CH3CHO + 4[H] --(Zn-Hg/HCl)--> CH3-CH3 + H2O …

Zinc amalgam with concentrated HCl is the classic Clemmensen reduction, which reduces a ketone's carbonyl group all the way down to a methylene ($-CH_2-$) group.

2-Butanone (methyl ethyl ketone, $CH_3-CO-CH_2-CH_3$) treated with zinc amalgam ($Zn/Hg$) and concentrated hydrochloric acid undergoes the Clemmensen reduction, which completely deoxygenates the carbonyl carbon, converting $C=O$ directly into $-CH_2-$:

$CH_3-CO-CH_2-CH_3 \xrightarrow{Zn(Hg)/conc.\,HCl} CH_3-CH_2-CH_2-CH_3$

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Clemmensen reduction converts the carbonyl group of an aldehyde or ketone directly into a CH₂ group, giving the corresponding hydrocarbon.

In Clemmensen reduction, an aldehyde or ketone is treated with zinc amalgam (Zn–Hg) and concentrated hydrochloric acid. This reduces the C=O group all the way to CH₂, converting the carbonyl compound into the corresponding alkane (hydrocarbon). It is especially useful for substrates that are stable to strong acid but would be destroyed by other reducing c …

Zinc amalgam and conc. HCl (Clemmensen reduction) convert the carbonyl group $>C=O$ into a $>CH_2$ group, so $A = >CH_2$ (a hydrocarbon).

Concept. Aldehydes and ketones can be reduced all the way to hydrocarbons. Clemmensen reduction uses zinc amalgam ($Zn(Hg)$) and concentrated hydrochloric acid to reduce the carbonyl carbon.

Reaction.

$>C=O \xrightarrow{Zn-Hg,\ conc.\ HCl} >CH_2 + H_2O$

The carbonyl oxygen is removed and replaced by two hydrogen atoms, converting $C=O$ into $CH_2$.

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Zn(Hg)/conc. HCl is the Clemmensen reduction, which reduces an aldehyde or ketone carbonyl completely to a CH2 group (i.e. to the corresponding alkane).

CH3CHO + 4[H] --Zn-Hg/HCl--> CH3-CH3 + H2O

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Clemmensen reduction converts a carbonyl group directly to $-CH_2-$ using zinc amalgam and concentrated hydrochloric acid.

In the Clemmensen reduction, an aldehyde or ketone's carbonyl group ($C=O$) is completely reduced to a methylene group ($-CH_2-$) by treating it with zinc amalgam ($Zn(Hg)$) and concentrated hydrochloric acid:

$R_2C=O \xrightarrow{Zn(Hg)/HCl} R_2CH_2$ …