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NEET Practice Questions (MCQs) with Answers & Solutions

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m-chlorobenzaldehyde on reaction with conc. KOH at room temperature gives:

potassium m-chlorobenzoate and m-hydroxybenzaldehyde

m-hydroxybenzaldehyde and m-chlorobenzylalcohol

m-chlorobenzylalcohol and m-hydroxy benzylalcohol

potassium m-chlorobenzoate and m-chlorobenzylalcohol

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Explanation

(d) Cannizzaro's reaction.

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Formylchloride has not been prepared so far. Which can function as formylchloride in formylation ?

HCHO + HCl

HCOOCH₃ + HCl

CO + HCl

HCONH₂ + HCl

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The major product H of the given reaction sequence is:

CH₃-CH₂-CO-CH₃ $\overset{{}_{-}{CN}}{\to}$ G $\to_{Heat}^{95 % H_{2} {SO}_{4}}$ H

${CH}_{3} - CH = \underset{|}{C} - COOH {CH}_{3}$

${CH}_{3} - CH = \underset{|}{C} - CN {CH}_{3}$

$OH {CH}_{3} - CH - C_{|}^{|} - COOH {CH}_{3}$

${CH}_{3} - CH = \underset{|}{C} - CO - {NH}_{2} {CH}_{3}$

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Acetic acid is obtained when:

glycerol is heated with sulphuric acid

methyl alcohol is oxidized with potassium permanganate

acetaldehyde is oxidized with potassium dichromate and sulphuric acid

calcium acetate is distilled in presence of calcium formate

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Explanation

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Main product of the reaction,

CH₃CONH₂+HNO₂ $\to$ ... is:

CH₃COOH

CH₃CH₂NH₂

CH₃NH₂

CH₃COONH₄

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Explanation

(a) CH₃CONH₂ $\overset{{HNO}_{2}}{\to}$ CH₃COOH+H₂O+N₂; the function of HNO₂ is to convert $—$ NH₂gp. to $—$ OH gp.

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The $-$ COOH group in a carboxylic acid can be replaced by 'H' by heating the acid with:

Zn with HCl

H₂in presence of nickel

sodalime

bromine and concentrated aqueous alkali

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Explanation

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The compound which on reduction with LiAlH₄gives two alcohols:

CH₃COOCH₃

CH₃CO-O-OC₂H₅

CH₃COCH₃

CH₃CHO

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Explanation

(a) CH₃COOCH₃ $\overset{{LiAlH}_{4}}{\to}$ CH₃CH₂OH+CH₃OH

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Acid chlorides react with Grignard reagents to give:

esters

ethers

carbonyl compounds

none of these

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Amides may be converted into amines by reaction named after:

Perkin

Claisen

Hofmann

Kekule

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Explanation

This is Hofmann's bromamide reaction.

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When formic acid reacts with PCl_3,it forms:

formyl chloride

acetyl chloride

methyl chloride

propionyl chloride

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Explanation

(a) 3HCOOH+PCl₃ $\to$ $\underset{(Less stable)}{3 HCOCl}$ +H₃PO₃

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