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What is the mechanism behind reduction of carboxylic acids to alcohol?

Important Questions on Aldehydes, Ketones and Carboxylic Acids

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α- chlorosodium acetate on boiling with aqueous sodium nitrite gives
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In the reaction,

CH 3 COOH LiAlH 4 A PCl 5 B Alc. KOH C ,

the product C is :
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The correct structure of the product P in the following reaction is

Asn-Ser+(CH3CO)2O(excess)NEt3P
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In the presence of a small amount of phosphorous, aliphatic carboxylic acid reacts with chlorine or bromine to yield a reaction in which, α-hydrogen is been replaced by halogen. This reaction is known as
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Propanoic acid undergoes HVZ reaction to give chloropropanoic acid. The product obtained is
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How will you bring about the following conversion in not more than two steps? 

Benzoic acid to m-Nitrobenzyl alcohol

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Which of the following derivatives of alcohols is unstable in an aqueous base?
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Give the chemical equation for the reaction of CH3COOH with following:

LiAlH4

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Which of the following acid will form an (a) Anhydride on heating and (b) Acid imide on strong heating with ammonia?
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Which of the following acids, does NOT undergo Hell-Volhard-Zelinsky reaction?
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Name the end product in the following series of reactions S ections

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The major product obtained in the reaction of aniline with acetic anhydride is
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An organic compound A upon reacting with NH3 gives B. On heating, B gives C. C in presence of KOH reacts with Br2 to give CH3CH2NH2. A is :
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With dehydrating agent present which dicarboxylic acid is least reactive towards forming an anhydride?