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Chemistry: CUET Mock Test - 4 - NEET MCQ


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40 Questions MCQ Test Chemistry Practice Tests: CUET Preparation - Chemistry: CUET Mock Test - 4

Chemistry: CUET Mock Test - 4 for NEET 2024 is part of Chemistry Practice Tests: CUET Preparation preparation. The Chemistry: CUET Mock Test - 4 questions and answers have been prepared according to the NEET exam syllabus.The Chemistry: CUET Mock Test - 4 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Chemistry: CUET Mock Test - 4 below.
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Chemistry: CUET Mock Test - 4 - Question 1

The activating effect of -NHCOCH3 group is ______ as compared to -NH2 group.

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 1

The -NHCOCH3 group forms two resonance structures, where the lone pair of nitrogen interacts with the lone pairs on oxygen atom. This makes the lone electron pair on N less available for donation to benzene ring.

Chemistry: CUET Mock Test - 4 - Question 2

Which of the following reactions/tests does not help in the distinction between ethylamine and diethylamine?

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 2

Both ethylamine and diethylamine on reaction with CH3CH2Br eventually gives quaternary ammonium salt. Hence, the alkylation of primary amines cannot be used as a distinction method.

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Chemistry: CUET Mock Test - 4 - Question 3

Which of the following amines, on reaction with benzenesulphonyl chloride, will give a sulphonamide that is insoluble in alkali?

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 3

Secondary amines on reaction with Hinsberg’s reagent produce sulphonamides without any hydrogen atom attached to the nitrogen atom. Hence, it is not acidic and therefore insoluble in alkali. The amide produced in this case is N-ethyl-N-methylbenzenesulphonamide.

Chemistry: CUET Mock Test - 4 - Question 4

Diethylamine reacts with nitrous acid in the cold to form _______

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 4

Secondary amines react slowly with nitrous acid at low temperatures to give yellow oily nitrosoamines. Diethylamine specifically produces N,N-diethylnitrosoamine.

Chemistry: CUET Mock Test - 4 - Question 5

What is the correct order of magnetic strength among the following elements?

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 5

Magnetic strength depends on the number of unpaired electrons possessed by the element. Iron, Cobalt, Nickel and Copper have 4, 3, 2 and 1unpaired electron respectively. Hence, the correct order of magnetic strength is: Fe > Co > Ni > Cu.

Chemistry: CUET Mock Test - 4 - Question 6

Which gas is produced when ethanamine reacts with nitrous acid?

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 6

Nitrogen gas is evolved due to the decomposition of diazonium salts which are formed from the reaction of 1° aliphatic amines with HNO2. This is used in the estimation of amino acids and proteins.

Chemistry: CUET Mock Test - 4 - Question 7

Benzoic acid is obtained from the oxidation of _______ with alkaline KMnO4 followed by treatment with mineral acid.

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 7

Only primary alcohols undergo oxidation in the presence of common oxidising agents followed by reaction with H3O+ to give the respective carboxylic acids. This reaction is proceeded by the removal of both hydrogen atoms from the alpha carbon and formation of a double bond between C and O.

Chemistry: CUET Mock Test - 4 - Question 8

Identify the product B in the reaction chain shown.

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 8

Ethyl bromide on reaction with alc. KCN gives ethyl cyanide by nucleophilic substitution. Nitriles can be hydrolysed to give amides and on further heating give a carboxylic acid which contains one more carbon than the original ethyl bromide. Hence, the acid contains three C atoms, making it propanoic acid.

Chemistry: CUET Mock Test - 4 - Question 9

Which of the following elements have a negative value of magnetic susceptibility?

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 9

Only Diamagnetic substances show a negative value of magnetic susceptibility. In the given list: oxygen and aluminium are paramagnetic, iron is ferromagnetic and nitrogen is diamagnetic. Therefore, Nitrogen has a negative value of magnetic susceptibility.

Chemistry: CUET Mock Test - 4 - Question 10

p-Xylene on reaction with acidified potassium dichromate at high temperature gives ________

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 10

p-Xylene is a dimethyl substituted benzene which on vigorous oxidation, gets oxidised to an aromatic dicarboxylic acid, with the two carboxyl groups at para positions with respect to each other. This compound is called terephthalic acid.

Chemistry: CUET Mock Test - 4 - Question 11

How can methyl magnesium bromide be converted to propanoic acid?

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 11

Methyl magnesium bromide (Grignard reagent) on reaction with CO2 forms an addition product containing an additional C carbon atom. This is decomposed in the presence of mineral acid to form propanoic acid.

Chemistry: CUET Mock Test - 4 - Question 12

Benzoic ethanoic anhydride on hydrolysis gives _______

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 12

Benzoic ethanoic anhydride (C6H5COOCOCH3) is easily hydrolysed with water to give its corresponding acids, benzoic acid (by adding H to C6H5COO) and ethanoic acid (by adding OH to COCH3).

Chemistry: CUET Mock Test - 4 - Question 13

The final product(s) of basic hydrolysis followed by acidification of ethyl butanoate is _______

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 13

Ethyl butanoate (CH3CH2CH2COOC2H5) on basic hydrolysis forms CH3CH2CH2COONa and ethanol. Then this sodium carboxylate compound gets acidified to give butanoic acid.

Chemistry: CUET Mock Test - 4 - Question 14

What is the temperature, above which a ferromagnetic substance shows no ferromagnetism called?

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 14

The Néel temperature or magnetic ordering temperature is the temperature above which an antiferromagnetic material becomes paramagnetic. The Critical temperature of a gas is the temperature above which it cannot be liquefied by pressure alone. The temperature above which a ferromagnetic substance shows no ferromagnetism is called Curie temperature.

Chemistry: CUET Mock Test - 4 - Question 15

Which of the following is known as Jones reagent?

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 15

Chromium trioxide in an aqueous solution with sulphuric acid in known as Jones reagent. It Is an important compound in the preparation of carboxylic acids from alcohols.

Chemistry: CUET Mock Test - 4 - Question 16

Identify the most suitable reagent for the conversion of ethanal to acetic acid.

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 16

Aldehydes are easily oxidized to carboxylic acids having the same number of carbon atoms as the parent aldehyde, when reacted even with mild oxidising agents like Tollen’s reagent.

Chemistry: CUET Mock Test - 4 - Question 17

 Identify X in the following conversion.Benzamide undergoes oxidation to form benzoic acid

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 17

Amides undergo hydrolysis in the presence of heat to give corresponding carboxylic acids along with ammonia gas. In the reaction shown, benzamide undergoes oxidation to form benzoic acid.

Chemistry: CUET Mock Test - 4 - Question 18

Which of the following pairs do not give the same compound on heating with alkaline potassium permanganate?

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 18

All mono-substituted alkyl benzenes, with primary or secondary alkyl groups, on vigorous oxidation give benzoic acid. The entire side chain is oxidised irrespective of the length. In case of o-xylene, there are two methyl groups on the benzene ring and both of them are oxidised to carboxyl group, resulting in phthalic acid.

Chemistry: CUET Mock Test - 4 - Question 19

Which of the following cannot be converted to benzoic acid on reaction with KMnO4-KOH followed by H3O+?

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 19

The ethyl group, acetyl group and ethene group are all oxidised to potassium carboxylate groups which are further oxidised to carboxyl groups. In the case of 4-Methylacetophenone, there are two groups that will be oxidised to carboxyl groups, hence forming terephthalic acid instead of benzoic acid.

Chemistry: CUET Mock Test - 4 - Question 20

3-Chlorophenyl magnesium bromide on reaction with dry ice followed by acidification in mineral acid gives _____

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 20

The MgBr group of 3-Chlorophenyl magnesium bromide (Grignard reagent) will be substituted by COOH group in the above reaction, to give a halogen substituted aromatic carboxylic acid.

Chemistry: CUET Mock Test - 4 - Question 21

Ethanoyl chloride on hydrolysis with aqueous NaOH gives _______

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 21

Acid chlorides are readily hydrolysed with aqueous base to give carboxylate ions which further give corresponding carboxylic acids on acidification. It can be directly obtained by direct hydrolysis with water.

Chemistry: CUET Mock Test - 4 - Question 22

Benzoic acid reacts with ______ to give ammonium benzoate salt, which on further dehydration gives benzamide.

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 22

Benzoic acid reacts with ammonia in a reversible reaction to form ammonium benzoate by addition reaction. This salt then loses water on heating to form benzamide.

Chemistry: CUET Mock Test - 4 - Question 23

Which of the following reagents does not reduce the CO group of carboxylic acids to CH2 groups to form alcohols?

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 23

Carboxylic acids on reduction with LiAlH4, B2H6 or H2 in the presence of suitable medium, are reduced to alcohols. The COOH group is reduced to CH2OH group. Sodium borohydride cannot reduce the carboxyl group.

Chemistry: CUET Mock Test - 4 - Question 24

Sodium acetate on heating with NaOH and CaO (3:1 mixture) gives _______

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 24

Sodium acetate undergoes decarboxylation (loss of CO2) when heated with soda lime. This is proceeded by the loss of COONa from the sodium salt and NaO from sodium hydroxide. They combine to form CH4 and Na2CO3. The hydrocarbon formed has one less carbon atom than the parent acid.

Chemistry: CUET Mock Test - 4 - Question 25

 Identify X in the following reaction.

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 25

Propanoic acid undergoes bromination at alpha-carbon in the presence of red phosphorus to give α-Bromopropanoic acid. This is known as Hell-Volhard-Zelinsky reaction.

Chemistry: CUET Mock Test - 4 - Question 26

What is formed when benzoic acid undergoes nitration in the presence of conc. HNO3 and conc. H2SO4?

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 26

Benzoic acid undergoes ring substitution in which the COOH group acts as a deactivating group and is meta-directing in nature.

Chemistry: CUET Mock Test - 4 - Question 27

Benzoic acid reacts with ______ to give m-Bromobenzoic acid.

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 27

Benzoic acid undergoes electrophilic substitution with bromine at the meta position in the presence of FeBr3 to form 3-bromobenzoic acid and hydrogen bromide as side product.

Chemistry: CUET Mock Test - 4 - Question 28

Ammonium acetate on removal of ______ forms acetamide.

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 28

mmonium acetate (CH3COO-NH4+) is an ammonium salt which on heating at high temperatures, loses a water molecule to give acetamide (CH3CONH2).

Chemistry: CUET Mock Test - 4 - Question 29

The conversion of phthalamide to phthalimide is brought about by the loss of ______ molecule.

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 29

Phthalic acid on reaction with NH3 forms ammonium phthalate, which on heating loses two H2O molecules, one from each COONH4 group, to form phthalamide. This on further strong heating loses one NH3 molecule to form phthalimide, which is an imide derivative of phthalic anhydride.

Chemistry: CUET Mock Test - 4 - Question 30

Soda lime consists of NaOH and CaO respectively, in the ratio of _______

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 30

Soda lime is the 3:1 mixture of sodium hydroxide and calcium oxide, and is used in the decarboxylation reaction (loss of carbon dioxide) of carboxylic acids.

Chemistry: CUET Mock Test - 4 - Question 31

Which of the following acids on Kolbe’s electrolysis gives ethane?

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 31

Aqueous solutions of sodium or potassium salts of carboxylic acids on electrolysis, undergo decarboxylation and form hydrocarbons having twice the number of carbon atoms as present in the alkyl group of the acid. Since ethane has two C atoms, the alkyl group of the acid should be CH3.

Chemistry: CUET Mock Test - 4 - Question 32

In which of the following magnetic properties of elements does the magnetic susceptibility increase on increasing the temperature?

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 32

On increasing the temperature, the magnetic susceptibility of diamagnetic substances do not change, that of paramagnetic and ferromagnetic substances decrease and that of antiferromagnetic substances increase.

Chemistry: CUET Mock Test - 4 - Question 33

Which among the following compounds can show the properties of a Ferroelectric substance?

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 33

At the Curie temperature (around 120 ºC) paraelectric BaTiO3 transforms into a ferroelectric structure. Ferroelectricity is the characteristic of certain substances that possess a spontaneous electric field which can be reversed by applying an external electric field.

Chemistry: CUET Mock Test - 4 - Question 34

Which of the following is not favourable for the proper dehydration of alcohol to form ether?

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 34

Secondary and tertiary alcohols give alkenes as major products during dehydration, because elimination competes over substitution. Hence, this method is mainly used for primary alcohols.

Chemistry: CUET Mock Test - 4 - Question 35

Sodium methoxide on heating with bromoethane gives ______

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 35

This is an example of Williamson synthesis of unsymmetrical ether, where CH3ONa is reacted with CH3CH2Br to form CH3CH2OCH3, which is ethyl methyl ether.

Chemistry: CUET Mock Test - 4 - Question 36

The boiling point of ethers is ______ the boiling point of alcohols of comparable molecular mass.

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 36

The large difference in boiling points of alcohols and ethers is due to the absence of intermolecular bonds in the latter.

Chemistry: CUET Mock Test - 4 - Question 37

 Which among the following compounds is Antiferroelectric?

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 37

In the given list: NiO and V2O3 are antiferromagnetic substances, Fe3O4 is Ferrimagnetic and PbZrO3 is antiferroelectric. Antiferroelectric materials are those materials having ions which can polarize without external field (spontaneous polarization).

Chemistry: CUET Mock Test - 4 - Question 38

One molecule of dialkyl ether produces how many molecules of alkyl halides with excess of halogen acid?

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 38

Dialkyl ethers when treated with excess halogen acid first form an alkyl halide and alcohol. The alcohol further reacts with the excess acid to form the same alkyl halide and a water molecule. Thus, two alkyl halide molecules are produced in the end.

Chemistry: CUET Mock Test - 4 - Question 39

What is the major product of bromination of anisole in ethanoic acid?

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 39

Phenyl alkyl ethers undergo bromination in the benzene ring with bromine in ethanoic acid. This due to the activation of benzene ring by OCH3 group and its ortho, para directing effect. The para isomer is obtained in 90% yield.

Chemistry: CUET Mock Test - 4 - Question 40

4-Nitroanisole is obtained as the major product when anisole reacts with _____

Detailed Solution for Chemistry: CUET Mock Test - 4 - Question 40

Anisole undergoes nitration in the presence of concentrated acids H2SO4 and HNO3 to yield a mixture of ortho and para nitroanisoles.

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