1. Tardigrade
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  3. Chemistry
  4. Ketones react with Mg - Hg over water gives :

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Q. Ketones react with $Mg - Hg$ over water gives :

AFMCAFMC 2005Aldehydes Ketones and Carboxylic Acids

Solution:

Ketones on reduction with magnesium amalgum and water form pinacols
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Ketones upon reaction with Grignard regent from tertiary-alcohol.
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Formaldehyde with Grignard reagent forms primary alcohol, acetaldehyde with Grignard reagent forms secondary alcohol.
$2^{\circ}$ alcohol (except formaldehyde which form $1^{\circ}$ alcohol).