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84951.

Addition of K_4[Fe(CN)_6] solution to FeCl_3 solution give

Answer»

Ferro-Ferricyanide
Ferric-Ferrocyanide
Ferric-Ferricyanide
None

Solution :`K_4[FE(CN)_6] + Fe^(+3) RARR Fe_4[Fe(CN)_6]_3`
84952.

Aldehydes and ketones differ in their chemical reactions. How do they with the following.? Alcohol

Answer»


ANSWER :(a) and (B) REFER to THEORY
84953.

Addition of hypochlorous acid to propyne gives :

Answer»

Dichloroacetaldehyde
1, 1-Dichloroacetone
1, 2-Dichloropropane
Ethylidene CHLORIDE

Solution :`UNDERSET("Propyne")(CH_(3)C -= CH) overset(HOCl)rarr CH_(3)underset(OH)underset(|)(C) = CH_(2)Cl overset(HOCl)rarr CH_(3) - underset(OH)underset(|)overset(OH)overset(|)(C) - CHCl_(2) rarr underset("1, 1-Dichloroacetone")(CH_(3) - overset(O)overset(||)(C) - CHCl_(2))`
84954.

Aldehydes and ketones differ in their chemical reactions. How do they with the following.? Tollens's reagent

Answer»


ANSWER :(a) and (B) REFER to THEORY
84955.

Addition of high proprotions of manganese makes steel useful in making rails of railrods , because manganse (i) Givens hartdness to steeel (II) Help the foramtiion of ocides of iron (iii) can remove oxy gen and sulpur (iv) Can show highest oxidation state of +7

Answer»

I,II,iii
I,iii
ii,iv
I,iii,iv

Answer :b
84956.

Aldehydesand ketonesform addition products with

Answer»

HYDROGEN cyanide
HYDRAZINE
Semicarbazide
PHENYLHYDRAZINE

Answer :A
84957.

Addition of high proportions of manganeses make steel useful in making rails of railroads, because manganese

Answer»

Gives hardness to steel
Helps the formation of oxides of iron
Can remove oxygen and sulphur
Can show highest oxidation state of `+7`

Solution :Maganese (Mn) imparts hardness to steel as well as removes oxygen and sulphur from steel by FORMING SLAG as `MnSiO_(3)`.
`Fe_(2)O_(3)+3Mnrarr2MnO+2Fe`
`MnO+SiO_(2)rarrunderset("(Slag)")(MnSiO_(3))`
84958.

Addition of HI on the double bond of propene yields isopropyl iodide and not n-propyl iodide as the major product. This is because the addition proceeds through:

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A more STABLE CARBONIUM ion
A more stable carbanion
A more stable FREE radical
None of the above being a CONCERTED reaction

Solution :
84959.

Aldehydes and ketones canbe distinguished by using.

Answer»

TOLLEN's reagent
Fehling's reagent
Benedict's solution
Hinsberg reagent

Solution :Aldehydes and ketons can be distinguished by
TOLLENS reagent - Test for aldehydes - SILVER MIRROR PPT
Fehling.s reagent - Test for aldehydes - `"Red" // "yellowish"` ppt
Bendict.s solution - Test for aldehydes - Brown colour ppt
84960.

Addition of HI on double bond of propene yields isopropyl iodide as major product. It is because the addition proceeds through:

Answer»

More STABLE carbocation
More stable carbanion
More stable FREE radical
Homolysis

Answer :A
84961.

Addition of HI in methylene cyclohexane gives

Answer»




ANSWER :C
84962.

Addition of HCN to ethyne in presence of Ba(CN)_(2) as catalyst gives

Answer»

1, 1-dicyanoethane
VINYL cyanide
ETHYL cyanide
Diviny cyanide

ANSWER :B
84963.

Addition of Hi in 2-methyl but- 1-en gives

Answer»




ANSWER :B
84964.

Aldehydes and ketones can be subjected to Clemmensen reduction and Wolf-Kishner reduction. Name the reagents used in both cases.

Answer»


ANSWER :Clemensens REDUCTION: Zn/Hg and HCL
Wolf-Kishner reduction-Hydrazine, KOH, Diethylene GLYCOL
84965.

Aldehydes and ketones can be reduced to corresponding hydrocarbons by __________.

Answer»

Refuxing with water
REFLUXING with strong acids
Refluxing with soda amalgam and water
Refluxing with ZINC amalgam and concentrated HCI

SOLUTION :`RCHO + 4H overset(Zn-Hg//HCI)rarr R-CH_(3)+H_(2)O`
84966.

Aldehydes and ketones can be reduced to hydrocarbon by using

Answer»

`LiAIH_(4)`
`H_(2)//Pd-BaSO_(4)`
`Na-Hg//HCI`
`NH_(2)-NH_(2)//C_(2)H_(5)ONa`

Solution :`HI//P//,Zn//Hg//"CONC".HCI` and `NH_(2)-NH_(2)//OH^(-)//C_(2)H_(5)ONa`
84967.

Addition of HCl to 2-methyl-2-butene mainly gives

Answer»

1-chloro-2-methylbutane
2-chloro-2-methylbutane
2-chlorobutane
1-chlorobutane

Solution :`CH_3 - underset(CH_(3))underset(|)(C) = CH - CH_(3) + HCl OVERSET("Markownikoff")underset("addn.")(to) underset("2 - chloro-2-methylbutane") (CH_(3)- underset(CH_(3))underset(|)overset(CL)overset(|)(C)- CH_(2) CH_(3))`
84968.

Addition of HCl does not obey anti-Markovnikov's rule because

Answer»

It is a STRONG acid
It is a GAS
Its BOND ENERGY is high
Its bond energy is less

Answer :C
84969.

Addition of HBr to an alkene in the presence of peroxides follows :

Answer»

Nucleophilic ADDITION
ELECTROPHILIC addition
Free radical addition
Nucleophilic SUBSTITUTION

Answer :C
84970.

Why aldehydes and ketones show nucleophilic addition reaction?

Answer»

HCN
`NaHSO_3`
Both (a) and (B)
None

Answer :C
84971.

Addition of HBr occurs most readily for

Answer»

`CH_2=CHCl`
`ClCH=CHCl`
`(CH_3)_2C=CH_2`
`C_6H_5underset(CH_3) UNDERSET(|)C=CH_2`

ANSWER :D
84972.

Both acetaldehyde and ketone react with:

Answer»

HCN
`NaHSO_3`
Both (a) and (B)
None

Answer :C
84973.

Addition of HBr to 2-methyl propene in the presence of peroxide mainly forms :

Answer»

2-Bromopropane <BR>1-Bromopropane
1-Bromo-2-methyl propane
2-Bromo-2-methyl propane

Solution :`CH_(3) - UNDERSET(CH_(3))underset(|)(C) = CH_(2) underset("Peroxide")OVERSET(HBr)rarr underset("1-Bromo-2-methylpropane")(CH_(3) - underset(CH_(3))underset(|)overset(H)overset(|)(C) - CH_(2)Br)`
84974.

Aldehydes and ketones both contain a _____ group.

Answer»

SOLUTION :CARBOXYL GROUP
84975.

Addition of HBr gives sameproduct in the presence or absence of peroxide when alkene is

Answer»

1-butuene
isobutylene
2,3-dimethyl-2-butene
propene

Answer :C
84976.

Aldehydes and ketones are reduced to hydrocarbons by zinc amalgam and conc. HCl. This is _______ reaction.

Answer»

Clemmenson's reduction
Wolff krishner reduction
Rosenmmund's reduction
catalytic reduction

Answer :A
84977.

Addition of H_2Oto an unsymmetric alkene in the process of sulphuric acid follows ………………… .

Answer»

SOLUTION :Markownikoff.s RULE
84978.

Aldehydes and ketones are organic compounds containing carbonyl group. Write a chemical reaction to distinguish between aldehydes and ketones.

Answer»


ANSWER :Aldehydes give SILVER mirror with Tollen's reagent whereas KETONES do not give this reaction.
84979.

Addition of halogen acid occurs at slowest rate in :

Answer»

`CH_2 = CHCI`
`CH_2 = CH_2`
`CH_3 - CH = CH = CH_2`
`(CH_3)_2C = CH_2`

ANSWER :D
84980.

Addition of H_(2) to accetylene gives ethane in presence of palladium but if BaSO_(4) and quinoline or sulphur are also added, the product is ethane. Why ?

Answer»

Solution :`CH-=CH+H_(2)overset(Pd)tounderset("Ethene")(CH_(2)=CH_(2))overset(""^(+)H_(2))UNDERSET(Pd)tounderset("Ethane")(CH_(3)-CH_(3))`
`CH-=CH+H_(2)overset(Pd+BaSO _(4))underset(+"quinoline/S")tounderset("Ethene")(CH_(2)=CH_(2))`
`BaSO_(4)+` quinoline/S posion the catalyst. Hence th efficiency of the catalyst decreases and the reaction stops at the first stagte of REDUCTION.
84981.

Aldehydes and ketones are reduced to hydrocarbon by the action of ....

Answer»

`LiAlH_4`
`H_2//Pd+BaSO_4`
`NA + Hg//HCl`
`NH_2 - NH_2 // C_2H_5 O Na`

SOLUTION :`NH_2 - NH_2 // C_2H_5 O Na`
84982.

Addition of Grignard reagents to dry ice followed by hydrolysis gives carboxylic acids while that of organolithium compounds under similar conditions gives ketones. Explain.

Answer»

SOLUTION :Sine electronegativity of Li (E.N.=1.0) is LOWER than that of Mg(E.N.=1.2), therefore, organolithium compounds are more nucleophilic than grignard reagents. As a result, organolithium compounds not only add to the more reactive `CO_(2)` but also the the less reactive RESONANCE stabilized LITHIUM salt of carboxylic acid thus formed to yield ketones.

Grignard reagents, on the other hand, being less nucleophilic add only to the more reactive `CO_(2)` but not to the less reactive resonance stabilized magnesium salt of the carboxylic acid from which carboxylic acid can be generated by hydrolysis with mineral ACIDS.
.
84983.

Aldehydes andketonesare obtainedby theactionofsulphuriseacid onsodiumsalt of ________ formalkyl nitrate .

Answer»

Nitro form
Pseudo- ACID form
Base- form
ACI- form

SOLUTION :
84984.

Addition of Grignard reagent to carbonyl compounds results into which alcohol ?

Answer»

`1^(@)`
`2^(@)`
`3^(@)`
All of these

SOLUTION :All of these
84985.

Addition of Grignard reagents to dry ice followed by hydrolysis gives carboxylic acids whereas that of organolithium compounds under similar conditions give ketones. Explain.

Answer»

SOLUTION :The electronegativity of Li (E.N. = 1.0) is LOWER than that of Mg (E.N. = 1.2) so that organolithium compounds are more nucleophilic than Grignard reagents. Therefore, organolithium compounds not only add to the more reactive `CO_2` but also to LESS reactive resonance stabilized lithium salts of carboxylic ACIDS forming ketones.

On the other hand, Grignard reagents are less nucleophilic and add only to CO, but not to less reactive resonance stabilized magnesium salts of carboxylic acids from which the carboxylic acid can be generated by hydrolysis with mineral acids.
84986.

Aldehydes and ketones ar specially susecptible to nucleophilic addition because carbonyl group is polar (due to electronegativity difference between carbon and oxygen) Positive charge on carbon makes it reactive towards the nucleophili. This addition is catalysed by acid. Reactivity of carbonyl compound towards nucleophilic addition increases with increases in the electron deficiency at carbonyl carbon. Thus, (-I.E.)groups increase while (+I.E.) groups decrease the reactivity of carbonyl compound. Which among teh following carbonyl compounds is most pola?

Answer»




ANSWER :D
84987.

Addition of ................... finds application in the separation and purification of carbonyl compounds.

Answer»

SOLUTION :`NaHSO_3`
84988.

Addition of ferric chloride solution to ferric hydroxide precipitate results in

Answer»

PEPTIZATION
PROTECTION
FLOCCULATION
DIALYSIS

ANSWER :A
84989.

Aldehydes and ketones are collectively known as _____.

Answer»

alcohols
ethers
acid derivatives
CARBONYL compounds

Solution :carbonyl COMPOUND
84990.

Aldehydes and ketones ar specially susecptible to nucleophilic addition because carbonyl group is polar (due to electronegativity difference between carbon and oxygen) Positive charge on carbon makes it reactive towards the nucleophili. This addition is catalysed by acid. Reactivity of carbonyl compound towards nucleophilic addition increases with increases in the electron deficiency at carbonyl carbon. Thus, (-I.E.)groups increase while (+I.E.) groups decrease the reactivity of carbonyl compound. Which among the following isomeric compounds is most reactive?

Answer»

`CH_(3)-CH_(2)-CH_(2)-CH_(2)-OVERSET(O)overset(||)C-H`
`CH_(3)-CH_(2)-CH_(2)-overset(O)overset(||)C-CH_(3)``CH_(3)-CH_(2)-overset(O)overset(||)C-CH_(2)-CH_(3)`

ANSWER :A
84991.

Addition of excess potassium iodide solution to a solution of mercuric chloride gives the halide complex

Answer»

tetrachedral `K_(2) [HgI_(4)]`
TRIGONAL `K[HgI_(3)]`
linear `Hg_(2)I_(2)`
square planer `K_(2) [HgCI_(2) I_(2)]`

SOLUTION :`HgCl_2 + 4KI to K_2[Hgl_4) + 2KCl`
`Hg : [Xe] 4f^(14) 5D^(10) 6S^(2)`
`Hg^(2+) : [Xe] 4f^(14) 5d^(10) (##MTG_WB_JEE_CHE_C15_E02_005_S01.png" width="80%">
84992.

Aldehydes and ketones ar specially susecptible to nucleophilic addition because carbonyl group is polar (due to electronegativity difference between carbon and oxygen) Positive charge on carbon makes it reactive towards the nucleophili. This addition is catalysed by acid. Reactivity of carbonyl compound towards nucleophilic addition increases with increases in the electron deficiency at carbonyl carbon. Thus, (-I.E.)groups increase while (+I.E.) groups decrease the reactivity of carbonyl compound. Carbonyl compounds show nucleophilic addition with :

Answer»

HCN
`NaHSO_(3)`
`(CH_(3)OH+HCl)`
all of these

ANSWER :D
84993.

Addition of FeCl_3 to K_4Fe(CN)_6 gives :

Answer»

PRUSSIAN blue
`Fe_4[Fe(CN)_6]_3`
FERRIC ferrocyanide
All

Answer :D
84994.

Aldehydes and ketone will not form crystalline drivatives with

Answer»

sidumbisulphite
phenyl hydrazine
semicarbazide hydrochloride
dihydrogen sodium PHOSPHATE

Solution :Dihydrogen sodium phosphate `(NaH_(2)PO_(4))` does not react with aldehydes and KETONES because `NaH_(2)PO_(4)` does not have any lone pair of electron on phosphorus atom, so its cannot act as a nucleophile.
84995.

Addition of excess of sodium hydroxide solution to stannous chloride solution, we obtain:

Answer»

`SN(OH)_2`
`SnO_2.H_2O`
`Na_2SnO_3`
`Na_2SnO_2`

ANSWER :D
84996.

Aldehydes and ketone are

Answer»

tautomers
chain isomers
functional isomers
position isomers

Answer :C
84997.

Aldehydes and ketone reacts with Grignards reagent gives

Answer»

MIXTURE of `1^@`, `2^@`, `3^@` alcohols
`1^@` or `2^@` or `3^@` alcohols
`1^@` or `2^@` alcohols
`2^@` or `3^@` alcohols

Answer :B
84998.

Addition of excess of AgNO_(3) to an aqueous solution oof 1 mole of PdCl_(4).4NH_(3) gives 2 moles of AgCl.The conductivity of this solution corresponds to

Answer»

`1:1` electrolyte
`1 : 3` electrolyte
`1 : 2` electrolyte
`1:4` electrolyte.

Answer :C
84999.

Aldehydes ahd ketones are converted to acetals by treatment with an alcohol and a trace of acid catalyst. These conditions also convert aldoses and ketoses to the acetals, call glycosides. In glycosides, an aglycone is the group bonded to the anomeric carbon atom. Example : Methanol is the aglycone in a methyl glycoside. In ethyl alpha-D glucopyranoside, aglycone part is

Answer»

`CH_(3)CH_(2)-`
`CH_(3)-`
`CH_(3)CH_(2)O-`
`CH_(3)OH`

ANSWER :C
85000.

Aldehyde with NH_(2) - NH_(2) forms

Answer»

ANILINE
nitrobenzene
hydrazine
hydrazone

Answer :D