Explore topic-wise InterviewSolutions in Current Affairs.

This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.

1.

Carcinogens are the products of the reaction between

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`R_(2) NH + HNO_(2)`
`R_(3)N + HNO_(2)`
`RNH_(2) + HNO_(2)`
None

Solution :Nitrosoamines.
Discussion
2.

Carcinogens are the products of the reaction between :

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`R_2NH + HNO_2`
`R_3N + HNO_2`
`RNH_2 + HNO_2`
None

Answer :A
Discussion
3.

Carbylamines have an offensive smell.How will you convert aniline into phenol?

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Solution :ANILINE is FIRST TREATED with `NaNO_2` and dil. HCl at 273-278 K to form BENZENE diazonium chloride. This solution on heating GIVES phenol.
Discussion
4.

Carbylamine test is used in the detection of

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ALIPHATIC `2^(@)` AMINE
AROMATIC `1^(@)` amine
Aliphatic `1^(@)` amine
Both aliphatic and aromatic`1^(@)` amines

Answer :D
Discussion
5.

Carbylamine test is performed in alcoholic KOH by heating a mixture of

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Chloroform and silver powder
Trichloro METHANE and a primary amine
An alkyl HALIDE and a primary amine.
An alkyl cyanide and a primary amine.

Solution :`1^(@)` amine `+CHCl_(3)toRNC`
Discussion
6.

Carbylamine test is performed in aloholic KOH by heating a mixture of

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Chloroform and silver powder
Trihalogenated methane and a primary AMINE
An ALKYL HALIDS and a primary amine
An alkyl cyanide and a primary amine.

Solution :Carbylamine TEST is performed in `KOH` by heating a MIXTURE of trihalogenated methane (eg., `CHCl_(3)`) and a `1^(@)` amine.
Discussion
7.

Carbylamine test is used for the detection of primary amine group, which of these is related with carbylamine reaction ?

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`R-NC`
`CHCl_(3)`
`NaNO_(2)+HCl`
`CCl_(2)`

SOLUTION :`R-CH_(2)overset(CHCl_(3))underset(+KOH)toR-NC`. Intermediate is `"CCL"_(2)`
Discussion
8.

Carbylamine test is performed by heating alc. KOH with :

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ANSWER :B
Discussion
9.

Carbylamine test is given by........amines.

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SOLUTION :PRIMARY
Discussion
10.

Carbylamine test is given by

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Alcohols
Primary amines
Carboxylic acid
Aldehyde.

Solution :`UNDERSET(1^(@)" amine")(RNH_(2))+3KOH+CHCl_(3) rarr underset(("Alkylisocyanide"),("(Bad SMELLING)"))(RNH+3KCl_+3H_(2)O`
Discussion
11.

Carbylamine reaction tubes are not thrown into sink , to avoid bad odour, but are treated with cons. HCl to give :

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`RCOOH + NH_3`
`RNH_2`
`RNH_2 + HCOOH`
`RCOOH + N_2`

ANSWER :C
Discussion
12.

Carbylamine reaction is used for the preparation of

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`1^@` Amines
Isocyanides
Amides
Cyanides

Solution :Carbylamine reaction :
`underset(1^@ " AMINE ") (R-NH_2) overset(CHCl_3 +KOH + DELTA)(to) underset("ISOCYANIDE")(R-NC)`
Discussion
13.

Carbylamine reactionis givenonly by

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primary amines
SECONDARY amines
tertiary amines
quatenary AMINE

Answer :A
Discussion
14.

Carbylamine reaction is given by underline ("secondary amines").

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SOLUTION :Carbylamine reaction is GIVEN by primary AMINES
Discussion
15.

Carbylaminereactionis NOTgivenby

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`C_(2) H_(5) NH_(2)`
`(C_(6)H_(5)) NH_(2)`
`CH_(3) NH_(2)`
`(CH_(3))_(3) N`

ANSWER :D
Discussion
16.

Carbylamine reaction can be used as a test for_____

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SOLUTION :PRIMARY AMINES
Discussion
17.

Carbylamine reaction is given by :

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PRIMARY amines
Secondary AMINE
TERTIARY amines
All

ANSWER :A
Discussion
18.

Carbylamines have an offensive smell. Write the carbylamine reaction.

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SOLUTION :Primary AMINES when HEATED with chloroform and alcholic KOH give carbyl AMINE having foul SMELL. The reaction is called carbylamine test.
Discussion
19.

Carbylamine is liberated when . . . . Is heated with chloroform and alcoholic potash

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An aldehyde
A PRIMARY amine
A SECONDARY amine
A phenol

Answer :B
Discussion
20.

Carbylamine reaction is used for detection of

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METHANAMINE
NITROMETHANE
ACETAMIDE
TRIMETHYLAMINE

ANSWER :A
Discussion
21.

Carbyl amine reaction is shown by secondary amine.

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SOLUTION :PRIMARY AMINE
Discussion
22.

Carbylamine forms from aliphatic or aromatic primary amines via which of the following intermediates?

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Carbene
Carbon radical
Carbocation
Carbanion

Answer :A
Discussion
23.

Carbyl amine reaction is shown by _____.

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SOLUTION :PRIMARY AMINES
Discussion
24.

Carboxylic carbon is……………….than carbonyl carbon :

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LESS ELECTROPHILIC
More electrophilic
less NUCLEOPHILIC
More nucleophilic

ANSWER :A
Discussion
25.

Carboxylic acids on reduction with LiAlH_(4) give :

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Alkanes
Alcohols
Aldehydes
Alkenes.

Answer :B
Discussion
26.

Carboxylic acids reacts with diazomethane to yield:

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AMINES
ALCOHOLS
EASTER
Amides

Answer :C
Discussion
27.

Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their-

Answer»

more EXTENSIVE association of CARBOXYLIC acid via VAN der Waals FORCE of attraction
formation of carboxylate ion
formation of INTRAMOLECULAR H-bonding
formation of intermolecular H-bonding

Answer :D
Discussion
28.

Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their

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more EXTENSIVE association of carboxylic ACID via VAN der Waals FORCE of attraction
FORMATION of carboxylate ion
formation of intramolecular H-bonding
formation of intermolecular H-bonding

Answer :D
Discussion
29.

Carboxylic acids have higher boiling point than aldehyde, keton and even alcohols of comparable molecular masses. Give reason.

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SOLUTION :Carboxylic acids have higher boiling point due to more association of acid MOLECULES through inter molecular hydrogen bonding.

In fact, most of the carboxylic acids exist as DIMER in its VAPOUR phase.
Discussion
30.

Carboxylic acids do not give reactions of aldehydes and ketones why ?

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Solution :It is due to RESONANCE . Position of ` GT C=O` GROUP KEEP changing .
Discussion
31.

Carboxylic acids do not give reactions of aldehydes and ketones, why?

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Solution :It is due to resonance
Carbon of the carboxylic ACID is not ABLE to attain a positive charge. THEREFORE, carboxylic acids do not GIVE reactions of aldehydes and ketones.
Discussion
32.

Carboxylic acids dissolve in aqueous NaOH because acids undego

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Protonation
Deprotonation
Carboxylation
Decarboxylation

Answer :B
Discussion
33.

Carboxylic acids dissociate to give resonance stablised carboxlate anion R-underset(O)underset(||)-OH+H_(2)OhArrH_(3)O^(+) The above statement is

Answer»

true sometimes true
sometimes false

Solution :Carboxylic ACIDS DISSOCIATES in water to GIVE RESONANCE stablised carboxylate anions and hydronium ions.
Discussion
34.

Carboxylic acids dissociate in water to give _______ stabilised carboxylate anions and hydronium ion.

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SOLUTION :RESONANCE
Discussion
35.

Carboxylic acids containing an amino group (-NH_(2)) as a substituent are called amino acids. When this amino group substitution is at alpha position with respect to carboxylic group, the aminoacid is called alpha-amino acid. The aminoacids with two carboxylic acids are called acidic amino acids whereas aminoacids with two amino group are called basic amino acids Amino acids show amphoteric character. Ali chiral natural amino acids exist in L-form. : Which of the following is not an alpha-amino acid?

Answer»




ANSWER :C
Discussion
36.

Carboxylic acids dimerise due to

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HIGH molecular WEIGHT
coordinate bonding
intermolecular HYDROGEN bonding
covalent bonding

Answer :C
Discussion
37.

Carboxylic acids containing an amino group (-NH_(2)) as a substituent are called amino acids. When this amino group substitution is at alpha position with respect to carboxylic group, the aminoacid is called alpha-amino acid. The aminoacids with two carboxylic acids are called acidic amino acids whereas aminoacids with two amino group are called basic amino acids Amino acids show amphoteric character. Ali chiral natural amino acids exist in L-form. : Each of the following represent natural alanine (an amino acid) except

Answer»




ANSWER :D
Discussion
38.

Carboxylic acids contain carbonyl group but do not show the nucleophilic addition reaction like aldehydes or ketones. Why?

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Solution :This is due to resonance as SOWN below:

The POSITIVE charge on carbonyl carbon ATOM is reduced.
Discussion
39.

Carboxylic acids are synthesised from Grignard reagent by the action of ________.

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`CO_(2)`
`H_(2)O`
`C_(6)H_(5)OH`
`CH_(3)OH`

Answer :A
Discussion
40.

Carboxylic acids are reduced by red P and HI to :

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Alkanes
Alcohols
Alkenes
Aldehydes.

Answer :A
Discussion
41.

Carboxylicacidsare moreacidic than phenolsandalchols. Explin. Why ?

Answer»

Solution : (1) Carboxylicacid losea proton as compared to phenol.Consider the ionizationof carboxylic acidandphenol.
`underset("alcohol")(R-OH) hArr underset("alkoxide ion")(R-O^(-)) +H^(+)`

Dueto delocalizationthe negativechargeoverthe ortho andparapositions of aromaticring, phenoxideanion is morestablethanphenol.
THUS phenoleasily undergoes ionization.

However, alcohol and alkoxide ion are single STRUCTURES. In an alkoxide ANION the negative charge is localized on a single oxygen atom. Hence, phenols are more acidic than alcohols.
Carboxylic acid has two resonarice hybride non equivalent structures (I & II) while carboxylate anion has two resonance hybrid equivalent structures (III & IV). The carboxylate ion is more stable than carboxylic acid and equilibrium is shifted towards the direction of increased ionization.

Carboxylate ion has two equivalent resonance structures with negative charge is delocalized over two electronegative oxygen atoms. Phenoxide anion has non-equivalent resonance structures in which negative charge is delocalized over one oxygen atom and less electronegative CARBON atom. As a result carboxylate anion is more stable than phenoxide ion. Hence carboxylic acids ionize to the greater extent than phenol furnishing higher concentration of H ions. Therefore, carboxylic acids are more acidic than phenols and alcohols.
Discussion
42.

Why carboxylic acids are more acidic than Phenols ?

Answer»
Discussion
43.

Carboxylic acids are esterified with alcohols or phenols in the presence of a _____.

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SOLUTION :MINERAL ACID
Discussion
44.

Carboxylic acids are distinctly acidic and ionise in water to give H_3O^+ ions. In general, electron withdrawing groups increase the acidity of carboxylic acids while electron donating groups decrease the acidity of the carboxylic acid. The electron releasing groups such as -CH_3-OH, -NH_2 and -OCH_3 make benzoic acid weaker while electron withdrawing groups such as -CI, -NO_2, etc., make benzoic acid stronger. The ortho isomer of every substituted benzoic acid is the strongest among the three isomers due to effect known as ortho effect. Carboxylic acids neutralise alkalies, decompose carbonates and bicarbonates evolving CO_2with brisk effervescence.Give a reaction for the preparation of benzoic acid using a Grignard reagent.

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SOLUTION :
Discussion
45.

Carboxylic acid reacts with potassium metal. The amount of potassium used up and hydrogen liberated are in the molar ratio of

Answer»

`2 : 1`
` 1 : 1`
` 3 : 2`
` 2 : 3`

ANSWER :A
Discussion
46.

Carboxylic acid reacts with calcium metal .The amount of calcium used up and hydrogenliberated are in the molar ratio of

Answer»

`2 : 1`
` 1 : 1 `
` 3 : 2`
` 2 : 3`

ANSWER :B
Discussion
47.

Carboxylic acid on reduction produces

Answer»

`1^@` ALCOHOLS
`2^@` alcohols
aldehydes
ketones

Answer :A
Discussion
48.

Carboxylic acid on reacting with N_3H gives :

Answer»

Amines
Amides
Acids
Aldehyde

Answer :A
Discussion
49.

Carboxylicacid is isomeric with

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ALDEHYDES
ALCOHOLS
esters
SATURATED ketones

ANSWER :C
Discussion
50.

Carboxylic acid is formed by the hydrolysis of an addition compound formed by reaction of Grignard's reagent with

Answer»

ETHANAL
METHANAL
carbon dioxide
METHYL CYANIDE

Answer :C
Discussion