Stephen reduction is used to prepare aldehyde from:

Alcohol

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Alkyl cyanide

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Alkanone

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Acid chloride

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Solution

The correct option is B Alkyl cyanide
Stephen reaction, also known by the name, Stephen aldehyde synthesis, was discovered by Henry Stephen. This chemical reaction involves the preparation of aldehydes from nitriles using tin(II) chloride, hydrochloric acid and quenching the resulting iminium salt with water. During the synthesis, ammonium chloride is also produced. Hence, the correct answer is option (b).

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