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Chemistry: CUET Mock Test - 5 - NEET MCQ


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Chemistry: CUET Mock Test - 5 for NEET 2024 is part of Chemistry Practice Tests: CUET Preparation preparation. The Chemistry: CUET Mock Test - 5 questions and answers have been prepared according to the NEET exam syllabus.The Chemistry: CUET Mock Test - 5 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Chemistry: CUET Mock Test - 5 below.
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Chemistry: CUET Mock Test - 5 - Question 1

Which of the following is the most suitable requirement for the dehydration of ethanol to form an ether?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 1

Alcohols undergo dehydration in the presence of protic acids to form either alkenes or ethers depending upon the reaction temperature conditions. At 413K, ethanol forms an ether with H2SO4.

Chemistry: CUET Mock Test - 5 - Question 2

What is the major product formed when ethanol is dehydrated with concentrated H2SO4 at 413K?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 2

Symmetrical ethers are formed when alcohols are dehydrated with H2SO4 at controlled temperatures. This is an SN2 reaction involving the attack of alcohol molecule on a protonated alcohol to give ethers.

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Chemistry: CUET Mock Test - 5 - Question 3

The reaction between tert-Butyl chloride and sodium ethoxide gives ____

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 3

The reactant sodium ethoxide is a strong nucleophile as well as a strong base, and hence elimination predominates over SN2 to form alkene as a major product.

Chemistry: CUET Mock Test - 5 - Question 4

What is defined as the concentration of dissolved solute in a solvent beyond which none of it, if added to the solvent, will increase the concentration further more?

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

Solubility is the maximum amount of solute that can be dissolved in a given solvent at a particular temperature and pressure. It is usually expressed in grams of solute dissolved in 100 grams of the solvent. Any more solute added beyond this forms a supersaturated solution as none of the particles dissolve any more.

Chemistry: CUET Mock Test - 5 - Question 5

Which of the following is the least reactive functional group?

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

Explanation: This is because the (-O-) group in ethers does not contain any active site as compared to for example, hydroxyl group (OH) in alcohols. However, they undergo C-O bond cleavage in drastic conditions.

Chemistry: CUET Mock Test - 5 - Question 6

What product(s) are formed when the shown ether is heated with hydrogen iodide?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 6

The C-O bond of the phenol group is stronger than the C-O bond of the ether and alkyl aryl group. This is due to the partial double bond character because of sp2 hybridised C-O cond. Therefore, the weaker C-O bond is broken and two major products, viz., phenol and iodomethyl benzene, are formed.

Chemistry: CUET Mock Test - 5 - Question 7

Identify the major product of Friedel-Crafts acylation of anisole with ethanoyl chloride?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 7

Anisole undergoes Friedel-Crafts acylation where an acyl group is introduced at ortho and para position by reaction with acyl chloride with anhydrous AlCl3 as catalyst. The para isomer will be the major product.

Chemistry: CUET Mock Test - 5 - Question 8

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

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 8

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

Chemistry: CUET Mock Test - 5 - Question 9

Cumene hydroperoxide on hydrolysis with dilute H2SO4 gives _________

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 9

When cumene hydroperoxide is hydrolysed with a solution of dilute acid, it results in the formation of phenol and acetone, of which the latter is obtained in large quantities.

Chemistry: CUET Mock Test - 5 - Question 10

Identify the compound ‘X’.

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 10

Oleum is a mixture of H2SO4 and SO3 that is added to benzene to form benzene sulphonic acid, which on subsequent treatment as shown, gives phenol.

Chemistry: CUET Mock Test - 5 - Question 11

Which of the following is the least soluble in water?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 11

As the size of the alkyl group becomes larger, it prevents the formation of hydrogen bonds with water molecules and hence the solubility goes on decreasing with the increase in the size or mass of the compound.

Chemistry: CUET Mock Test - 5 - Question 12

Phenol is approximately how much times acidic than ethanol?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 12

Phenol is more acidic than alcohols because of their better stability and resonant structures. The pKa values of phenol and ethanol are 10 and 15.9 respectively, which when converted to Ka values gives a ratio of about a million.

Chemistry: CUET Mock Test - 5 - Question 13

What is the correct order of boiling points of alcohols having the same number of carbon atoms?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 13

As the branching in the structure increases, the surface area decreases and hence, the van der Waal forces decrease. This results in the reduction of boiling points of isomeric alcohols from primary to tertiary structures.

Chemistry: CUET Mock Test - 5 - Question 14

If the boiling point of methoxymethane is 248K, predict the boiling point of ethanol.

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 14

Methoxymethane and ethanol are of comparable masses and it can be easily pointed out that ethanol will have a higher boiling point than it because of the presence of intermolecular hydrogen bonding. 455K is very high and is actually the boiling point of phenol.

Chemistry: CUET Mock Test - 5 - Question 15

How does the solubility of gas change in a liquid, as described?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 15

In an equilibrium system of gas dissolved in solvent, when pressure over it is increased more and more gas particles are forced into a smaller volume. This also increases the rate at which they strike the surface of the solvent to enter it. Consequently, more gas dissolves with increasing pressure. In the case of increasing temperature, gas particles gain sufficient energy to escape the solvent and solubility decreases.

Chemistry: CUET Mock Test - 5 - Question 16

If, at 298 K water is the solvent, and Henry’s law constant for CO2 is 1.67 kbar and the constant of argon is 40.3 kbar, which of the following statements is true?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 16

Henry’s law is formulated asp = KH x X (mole fraction). From this, it is seen that as KH increases, mole fraction decreases in order to compensate the increase in partial pressure of the gas. Hence, higher the KH value lower is the solubility. Therefore, argon is less soluble in water than CO2 at 298 K.

Chemistry: CUET Mock Test - 5 - Question 17

Phenol can be obtained by ________ of sodium phenoxide.

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 17

When halobenzene is fused with NaOH at 623K and 320atm with a copper salt as catalyst, sodium phenoxide is produced which on treatment with dilute HCl yields phenol. This is also known as Dow’s process.

Chemistry: CUET Mock Test - 5 - Question 18

 How is carbolic acid prepared from benzene diazonium chloride?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 18

Carbolic acid is another name for phenol. Simply warming an aqueous solution of benzene diazonium chloride salt or treating it with a dilute acid, will result in the formation of phenol.

Chemistry: CUET Mock Test - 5 - Question 19

Which of the following isomeric alcohols is the most soluble in water?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 19

tert-Butyl alcohol is the most heavily branched isomer and is tightly packed compared to the others. This decreases the effective surface area of the alkyl part which is hydrophobic in nature.

Chemistry: CUET Mock Test - 5 - Question 20

Which of the following is necessary for the bromination of phenol?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 20

FeBr3, AlCl3 and BF3 are Lewis acids, that are required for the substitution in benzene. Phenol has an OH group that activates the aromatic ring and requires the presence of only slightly or non-polar solvents for its halogenation.

Chemistry: CUET Mock Test - 5 - Question 21

Phenols are not soluble in which of the following?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 21

Phenols are almost insoluble in water because of the presence of a very large non-polar aryl group which overcomes the polar character of the OH group.

Chemistry: CUET Mock Test - 5 - Question 22

our compounds A, B, C and D having similar molecular masses were tested for their boiling points. It was found that compound C has the highest boiling point of all four. What is the compound C most likely to be?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 22

Of compounds having similar molecular masses, alcohols will certainly have the highest boiling point due to the presence of intermolecular hydrogen bonding which is lacking in hydrocarbons, haloalkanes and ethers.

Chemistry: CUET Mock Test - 5 - Question 23

Which of the following has the highest boiling point?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 23

As the size the molecule increases, the number of carbon atoms increases and the van der Waal forces increase, resulting in an increase in boiling points.

Chemistry: CUET Mock Test - 5 - Question 24

Which of the following process do not yield alcohols?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 24

Alkanes on free radical halogenation produce a mixture of haloalkanes and not alcohols. Alcohols can be prepared from alkenes by acid catalysed hydration and hydroboration-oxidation or from reduction of aldehydes.

Chemistry: CUET Mock Test - 5 - Question 25

Propene when reacted with water in the presence of H2SO4 gives _________

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 25

Since propene is an unsymmetrical alkene, the given hydration reaction takes place in accordance to Markovnikov’s rule, to form propan-2-ol. The double bond is broken and the OH group attaches at the second carbon.

Chemistry: CUET Mock Test - 5 - Question 26

Identify the nucleophile that attacks the carbocation in the second step of acid catalysed hydration of alkenes?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 26

Nucleophiles are electron rich species that attack the part of the structure that is electron deficient. In this step, the H2O nucleophile attacks the carbocation forming a protonated alcohol.

Chemistry: CUET Mock Test - 5 - Question 27

Which compound reacts with propene to form tripropyl borane?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 27

Diborane (B2H6) reacts with alkenes to give trialkyl boranes as a product of successive addition. Firstly, CH3CH2CH2(BH2) is formed which reacts with propene to give (CH3CH2CH2)2BH, which further reacts with propene to finally give (CH3CH2CH2)B, which is tripropyl borane.

Chemistry: CUET Mock Test - 5 - Question 28

What is the concentration of N2 in a fresh water stream in equilibrium with air at 298 K and 1 atmosphere? Given the value of KH for N2 = 0.00060 mole/kgbar.

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 28

Given,
KH = 0.00060 mole/kgbar
PN2 = mole fraction of N2 x Pair (from Dalton’s law)
Air consists of 79 mole% N2 and 21 mole% O2.
PN2 = 0.79 x 1 bar= 0.79 bar
Henry’s law –PN2x KH= solubility of N2
0.79 bar x 0.00060 (mole/kgbar) = solubility of N2
Solubility of N2 = 4.74 x 10-4 moles of N2/kg water
Converting moles of N2 to kg of N2 :
Solubility of N2 = 4.74 x 10-4 mole x 28 kg/mole = 0.0133 kg N2/kg water = 13.3 g N2/kg water.

Chemistry: CUET Mock Test - 5 - Question 29

Which carbonyl compound yields secondary alcohols when treated with LiAlH4?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 29

Ketones react with reducing agents LiAlH4 or NaBH4 to get reduced to alcohol where the OH group is formed at the C of the C-O group. This results in the C being bonded to two alkyl groups apart from the OH and H atom.

Chemistry: CUET Mock Test - 5 - Question 30

Hydrolysis of the adduct formed form the reaction of ________ with methyl magnesium bromide gives 2-Methylpropan-2-ol.

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 30

2-Methylpropan-2-ol is a tertiary alcohol which is produced from the hydrolysis of the adduct formed between a ketone and a Grignard reagent.

Chemistry: CUET Mock Test - 5 - Question 31

How are alcohols prepared from haloalkanes?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 31

Haloalkanes when heated with aqueous NaOH or KOH give respective alcohols. This is a nucleophilic substitution reaction where the halide group is replaced by the OH nucleophile.

Chemistry: CUET Mock Test - 5 - Question 32

Identify the catalyst in the hydration of alkenes to produce alcohols.

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 32

Alkenes react with water in the presence of a mineral acid as a catalyst to form alcohols. The H+ ion from the acid helps to form a carbocation for nucleophilic attack.

Chemistry: CUET Mock Test - 5 - Question 33

The first step of the acid catalysed hydration of alkenes, involves the protonation of alkene to form a carbocation by electrophilic attack of _______

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 33

The water reacts with the H+ ion of the mineral acid to form a hydronium ion (H3O+). This ion attacks the carbon double bond to form a carbocation and give a water molecule.

Chemistry: CUET Mock Test - 5 - Question 34

Name the following step from the mechanism of acid catalysed hydration of ethene.

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 34

In this step, the electron pair of water attack the protonated alcohol, resulting in the loss of H+ from oxygen (deprotonation) to form an alcohol.

Chemistry: CUET Mock Test - 5 - Question 35

Which of the following is not required for the conversion of trialkyl borane to an alcohol?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 35

Trialkyl boranes are oxidised by hydrogen peroxide in the presence of aqueous NaOH to form alcohols. Diborane is not required for this conversion but is essential in the production of trialkyl boranes.

Chemistry: CUET Mock Test - 5 - Question 36

What happens when an aldehyde is treated with lithium aluminium hydride?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 36

LiAlH4 acts as a reducing agent which reduces an aldehyde by adding hydrogen atoms to it result in the formation of a primary alcohol.

Chemistry: CUET Mock Test - 5 - Question 37

What characteristic of water accounts for its unique properties as a solvent?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 37

Water is a universal solvent. It has the ability to dissolve the greatest number of substances than any other solvent. The highly polar nature accounts for this special feature as the water molecule bears a slightly positively charged hydrogen ion and two highly negatively charged oxygen ions. Since, it becomes attracted to many different types of molecules it is known as the ‘universal solvent’.

Chemistry: CUET Mock Test - 5 - Question 38

Which of the following aldehydes can produce 1o alcohols when treated with Grignard reagent?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 38

Methanal on treatment with Grignard reagent forms an adduct which has only one alkyl group attached to the C atom along with two hydrogens and one O-Mg-X (X=halogen) group. This on hydrolysis will form a primary alcohol where the OH group will replace the O-Mg-X group.

Chemistry: CUET Mock Test - 5 - Question 39

Which of the following haloalkanes exist as liquids at room temperature?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 39

The lower members like methyl chloride, methyl bromide and ethyl chloride exist as gases at room temperature. The higher members exists as liquids or solids.

Chemistry: CUET Mock Test - 5 - Question 40

Which of the following has the highest boiling point?

Detailed Solution for Chemistry: CUET Mock Test - 5 - Question 40

The boiling points increase with the number of halogen atoms as the molecular masses increase and so do the intermolecular forces of attraction.

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