Write structure of the following : Phenyl hydrazine derivative of benzaldehyde.

Aldehydes and ketones react with phenylhydrazine in presence of dilute mineral acids like HCl forming crystalline phenylhydrazones. Benzaldehyde reacts with phenylhydrazine to form C 6 H 5 HC = N . NHC 6 H 5 . The structure of phenyl hydrazine derivative of benzaldehyde is,

Write structure of the following : Cyclohexanone oxime.

The IUPAC name of cyclohexanone oxime is N-cyclohexylidenehydroxylamine. It is prepared from the condensation reaction between cyclohexanone and hydroxylamine. Cyclohexanone oxime is used primarily as captive intermediate in the synthesis of caprolactam and also in a variety of industrial applications.

Answer the following questions : Write structures of A and B in the following reaction : CH ≡ CH → HgSO 4 H 2 O , H + A → [ O ] B

On passing the vapours of ethyne through 42 % sulphuric acid in the presence of catalyst mercuric sulphate at 333 K , ethanal is formed. CH ≡ CH → HgSO 4 H 2 O , H + CH 3 CHO ( A ) Aldehydes readily gets oxidised to carboxylic acids by mild oxidizing agents. Acetaldehyde undergoes oxidation to give acetic acid. CH ≡ CH → HgSO 4 H 2 O , H + CH 3 CHO → [ O ] CH 3 COOH ( B )

Write a chemical equation for the preparation of Benzamide from Benzoic acid.

Carboxylic acids react with ammonia to form ammonium salts which when heated decompose to give amides. Benzoic acid reacts with ammonia to form ammonium benzoate which undergoes decomposition to give benzamide.

Arrange the following compounds in order of their increasing reactivity towards HCN : CH 3 CHO , HCHO , CH 3 COCH 3 .

Aldehydes are more reactive than ketone towards nucleophilic reagents because the inductive effect in aldehydes is less prominent than that in ketones. The steric hindrance caused by alkyl groups is another reason for less reactivity of ketones and higher aldehydes towards nucleophilic reagents like HCN . Therefore, the increasing order of reactivity towards HCN is, CH 3 COCH 3 < CH 3 CHO < HCHO

Name the product formed when : Acetyl chloride reacts with H 2 in presence of Pd and BaSO 4 .

Aldehyde can be prepared by the reduction of acid chloride with hydrogen in boiling xylene in the presence of palladium catalyst supported on barium sulphate. This reaction is known as Rosenmund's reaction. Acetyl chloride reacts with H 2 in presence of Pd and BaSO 4 to give ethanal. CH 3 COCl Acetyl chloride + H 2 → boiling xylene Pd / BaSO 4 CH 3 CHO + HCl

Name the product formed when : Toluene is oxidised using KMnO 4 , KOH followed by hydrolysis.

When an alkyl benzene is treated with an oxidising agent such as alkaline solution of KMnO 4 , the alkyl group is oxidized to carboxylic group irrespective of its size. Toluene reacts with KMnO 4 , KOH to form potassium salt of benzoic acid which on hydrolysis gives benzoic acid.

E M B I B E

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter -1 - Aldehydes, Ketones and Carboxylic Acids>Goa Board-2018>Q 1

EASY

12th Goa Board

IMPORTANT

Earn 100

Give reason why aromatic carboxylic acids do not undergo friedel-crafts reaction.

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