Chemistry MCQs for NEET — Practice Questions with Answers

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Picric acid and benzoic acid can be distinguished by:

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Explanation

Picric acid has phenolic gp.

Butan-2-ol is:

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Explanation

(b) It contains >CHOH gp.

CH3CH2ClNaCNNi/H2YAcetic anhydrideZ

In the above reaction sequence, Z is

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Explanation

(a) CH3CH2ClNaCNCH3-CH2-CN Ni/H2 CH3-CH2CH2NH2anhydrideacetic                                                                                   X                                      Y                       CH3-CH2-CH2-NHCOCH3

                                                                                                                         Z

               

The commonly used dehydrating agent in the preparation of an ester is :

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Explanation

(d) H2SO4 acts as catalyst as well as dehydrating agent for the reaction,

        CH3COOH+HOC2H5H2SO4CH3COOC2H5

Oxidation of ally alcohol, (CH2=CH-CH2OH) gives a mixture of oxalic acid and formic acid. If this oxidation is done in presence of bromine. One would expect only:

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Explanation

(d) Only CH2OH gp. is oxidized to -COOH; Double bond is not affected.

Consider the following reaction, 

Ethanol PBr3XAlc.KOHY(ii)H2O, heat(i) H2SO4, room temperatureZ

The product Z is

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Explanation

(d) C2H5OH(Ethanol)PBr3C2H5Br β- elimination-K Br    -H2O  Alc. KOHCH2=CH2H2SO4CH3-CH2OSO3H

    

-H2SO4  H2O /CH3CH2OH

                   Ethanol

Which of the following are known as mercaptans?

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Explanation

R-SH are thiols or mercaptans

Identity Z in the sequence of reactions,

CH3CH2CH=CH2HBr2/H2O2C2H5ONaZ

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Explanation

(a) CH3CH2CH=CH2Anti-Markownikoff's ruleHBr2/H2O2 CH3CH2CH2CH2Br Bromo-butanane (1° product)  CH3CH2CH2CH2BrSN2 reaction         ( Williamson's synthesis)C2H5ONaCH3CH2CH2CH2OC2H5  

                                                                              Ethoxy - butane

Salol is used as:

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Explanation

(a) Salol is phenyl salicylate and is used as antiseptic

Ethyl propanoate on reduction with LiAlH4 yields:

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Explanation

(b) C2H5COOC2H5LiAlH4C2H5CH2OH + C2H5OH

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