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85001.	Aldehyde with atleast one alpha hydrogen undergo aldol condensation. Two molecles of same or different aldehydes take part in such condensation. Ketones under similar condition give ketol condensatio. These reactions is best done with Ba(OH_(2)) . intramolecular aldol condensation is given by dialhydes, diketones aldol condensation is given by dialdehydes, diketones or keto aldehydes. The diketones should be 2,3, 2,6, 2,7 and 2,8 diketones. Intramolecular aldol condensation is the best method for prepartion of five and six memebered ring. For example: CH_(3)-overset(O)overset(\|\|)C-H+CH_(3)-overset(O)overset(\|\|)C-overset(NaOH(dil.))rarrCH_(3)-underset(H)underset(\|)overset(OH)overset(\|)C-CH_(2)CHO Mixture of HCHO and CH_(3)CHO will not give aldol condensation.
Answer» ANSWER :B

85002.	Aldehyde with atleast one alpha hydrogen undergo aldol condensation. Two molecles of same or different aldehydes take part in such condensation. Ketones under similar condition give ketol condensatio. These reactions is best done with Ba(OH_(2)) . intramolecular aldol condensation is given by dialhydes, diketones aldol condensation is given by dialdehydes, diketones or keto aldehydes. The diketones should be 2,3, 2,6, 2,7 and 2,8 diketones. Intramolecular aldol condensation is the best method for prepartion of five and six memebered ring. For example: CH_(3)-overset(O)overset(\|\|)C-H+CH_(3)-overset(O)overset(\|\|)C-overset(NaOH(dil.))rarrCH_(3)-underset(H)underset(\|)overset(OH)overset(\|)C-CH_(2)CHO Cyclohexanone when treated withBa(OH)_(2) gives, as a result of aldol condensation.
Answer» ANSWER :A

85003.	Aldehyde with atleast one alpha hydrogen undergo aldol condensation. Two molecles of same or different aldehydes take part in such condensation. Ketones under similar condition give ketol condensatio. These reactions is best done with Ba(OH_(2)) . intramolecular aldol condensation is given by dialhydes, diketones aldol condensation is given by dialdehydes, diketones or keto aldehydes. The diketones should be 2,3, 2,6, 2,7 and 2,8 diketones. Intramolecular aldol condensation is the best method for prepartion of five and six memebered ring. For example: CH_(3)-overset(O)overset(\|\|)C-H+CH_(3)-overset(O)overset(\|\|)C-overset(NaOH(dil.))rarrCH_(3)-underset(H)underset(\|)overset(OH)overset(\|)C-CH_(2)CHO When mixture of ethanal and propanal is treatedwith aqueous NaOH, the product contains 4 aldols.
Answer» ANSWER :A

85004.	Aldehyde with atleast one alpha hydrogen undergo aldol condensation. Two molecles of same or different aldehydes take part in such condensation. Ketones under similar condition give ketol condensatio. These reactions is best done with Ba(OH_(2)) . intramolecular aldol condensation is given by dialhydes, diketones aldol condensation is given by dialdehydes, diketones or keto aldehydes. The diketones should be 2,3, 2,6, 2,7 and 2,8 diketones. Intramolecular aldol condensation is the best method for prepartion of five and six memebered ring. For example: CH_(3)-overset(O)overset(\|\|)C-H+CH_(3)-overset(O)overset(\|\|)C-overset(NaOH(dil.))rarrCH_(3)-underset(H)underset(\|)overset(OH)overset(\|)C-CH_(2)CHO In the reaction,
Answer» ANSWER :A

85005.	Addition of excess aqueous ammonia to a pink coloured aqueous solution of MCl_(2).6H_(2)O(X) and NH_(4)Cl gives an octahedral complex Y in the presence of air. In aqueous solution, complex Y behaves as 1:3 electrolyte. The reaction of X with excss HCl at room temperature results in the formation of a blue coloured complex Z. the calculated spin only magnetic moment of X and Z is 3.87 BM, whereas it is zero of complex Y. Among the following options, which statement(s) is (are) correct ?
Answer» The hybridization of the central metal ion in Y is `d^(2)sp^(3)` ADDITION of silver nitrate of Y gives only TOW equivalents of silver chloride When X and Z in equilibrium at `0^(@)C`, the COLOUR of the solution is pink Z is a TETRAHEDRAL complex. Answer :A::C::D

85006.	Aldehyde which shows Cannizzaro's reaction is
Answer» `H - CHO` `C_(6) H_(5) - CHO` `C Cl_(3) - CHO` all of these ANSWER :D

85007.	Addition of excess aqueous ammonia to a pink coloured aqueous solution of MCl_(2).6H_(2)O( X) and NH_(4)Cl gives an octahedral complex Y in the presence as 1:3 electrolyte. The reaction of X with excess HCl at room temperature results in the formation of a blue coloured complex Z. The calculated spin only magneticmoment of X and Z is 3.87 B.M., where it is zero for complex Y. Among the following options, which statemens(s) is (are) correct
Answer» The hybridization of the central metal ion in Yis `d^(2)sp^(3)` Additoin of silver nitrate to Y gives only two EQUIVALENTS of silver chloride When X and Z are in equilibrium of `0^(@)C` ,the coloure of the solution in pink Z is a tetrahedral complex Solution :`[Co(H_(2)O)_(6)]Cl_(2)underset(NH_(4)Cl+"Air")overset(NH_(3)(aq))(rarr)[Co(NH_(3))_(6)]Cl_(3)` Blue solution ( Tetrahedral , `sp^(3))` X `&` Z in equilibrium at `0^(@)Cimplies ` Then equilibrium is shifted towards X, makinig colour of solution pink

85008.	Aldehyde with atleast one alpha hydrogen undergo aldol condensation. Two molecles of same or different aldehydes take part in such condensation. Ketones under similar condition give ketol condensatio. These reactions is best done with Ba(OH_(2)) . intramolecular aldol condensation is given by dialhydes, diketones aldol condensation is given by dialdehydes, diketones or keto aldehydes. The diketones should be 2,3, 2,6, 2,7 and 2,8 diketones. Intramolecular aldol condensation is the best method for prepartion of five and six memebered ring. For example: CH_(3)-overset(O)overset(\|\|)C-H+CH_(3)-overset(O)overset(\|\|)C-overset(NaOH(dil.))rarrCH_(3)-underset(H)underset(\|)overset(OH)overset(\|)C-CH_(2)CHO CCl_(2)-CHO gives aldol aondensation.
Answer» ANSWER :B

85009.	Aldehyde used in the manufacture of perfumes is
Answer» HCHO `CH_3CHO` `C_6H_5 CHO` `C Cl_3CHO` ANSWER :C

85010.	Addition of excess aqueous ammonia to a pink coloured aqueous solution of MCl_(2).6H_(2)O (X) and NH_(4)Cl gives an octahedral complex Y in the pressure of air. In aqueous solution, complex Y behaves as 1 : 3 electrolyte. The reaction of X with excess HCl at room temperature results in the formation of a blue coloured compelx Z. The calculated spin only magnetic moment of X and Z is 3.87 B.M., whereas it is zero for complex Y. Among the following options, which statement(s) is(are) correct ?
Answer» The hybridization of the central metal ion in Y id `d^(2)sp^(3)` Addition of silver nitrate to Y gives only two equivalents of silver CHLORIDE When X and Z are in equilbrium at `0^(@)C`, the COLOURED of the solution is PINK Z is a tetrahedral complex Answer :A::C::D

85011.	Aldehyde turns pink with
Answer» BENEDICT solution Schiff 's BASE FEHLING solution Tollen's reagent Solution :Schiff .s base

85012.	Aldehyde, ketone, acid and acid derivatives contain gtC=O group. Aldehyde and ketones gives nucleop addition reactions where as acid and acid derivatives gives nucleophilic addition followed by ellmination reaction Nucleophilic addition reactions followed by ellimination of acid derivatives is known as acyl substitution reacts This subsitution reaction takes places by formation of tertrahedral intermediate. Which one of the following is least reactive compound for nucleophilic acyl substitution.
Answer» ANSWER :B

85013.	Aldehyde, ketone, acid and acid derivatives contain gtC=O group. Aldehyde and ketones gives nucleop addition reactions where as acid and acid derivatives gives nucleophilic addition followed by ellmination reaction Nucleophilic addition reactions followed by ellimination of acid derivatives is known as acyl substitution reacts This subsitution reaction takes places by formation of tertrahedral intermediate. For the given reaction which of these is correct?
Answer» L must be better leaving group than NU `Nu^(-)` must be STRONG enough nucleophile to ATTACK CARBONYL carbon Carbonyl carbon must be enough electrophilic to react with `Nu^(-)` ANSWER :D

85014.	Aldehyde shows functional isomerism with
Answer» ALIPHATIC ether ketones DIMER of ETHANOIC acid thio cyclic ether Answer :B

85015.	Aldehyde, ketone, acid and acid derivatives contain gtC=O group. Aldehyde and ketones gives nucleop addition reactions where as acid and acid derivatives gives nucleophilic addition followed by ellmination reaction Nucleophilic addition reactions followed by ellimination of acid derivatives is known as acyl substitution reacts This subsitution reaction takes places by formation of tertrahedral intermediate. Which of the following compounds has very poor leaving group?
Answer» ANSWER :A

85016.	Addition of excess aqueous ammonia to a pink coloured aqueous solution of MCl_(2). 6H_(2)O (X) and NH_(4)Cl gives an octahedral complex Y in the presence of air. In aqueous solution, complex Y behaves as 1 : 3 electrolyte. The reaction of X with excess HCl at room temperature results in the formation of a blue coloured complex Z. The calculated spin only magnetic moment of X and Z is 3.87 B.M.,whersas it is zero for complex Y. Among the following options, which statement (s) is (are) correct ?
Answer» The hybridisation of the central metal ION in Y is `d^(2) sp^(3)` Addition of silver nitrate to Y given only TWO equivalents os silver chloride When X and Y are in equilibrium at `0^(@)C`, the COLOUR of the solution is pink Z is a tetrahedral complex Answer :A::B::D

85017.	Aldehyde on reaction with Grignard reagent and subsequent hydrolysis yields
Answer» primary alcohol TERTIARY alcohol SECONDARY alcohol DIHYDROXY alcohol Answer :C

85018.	Addition of excess aqueous ammonia to a pink coloured aqueous solution of MCl_(2). 6H_(2)O(X) and NH_(4)Cl gives an octahedral complex Y in the presence ofair. In aqueous solution, complex Y behaves as 1:3 electrolyte. The reaction of X with excess HCl at room temperature results in the formation of a blue coloured complex Z. The calculated spin only magnetic moment of X and Z is 3.87 B.M., whereas it is zero for complex Y. Among the followingoptions, which statement is incorrect ?
Answer» The hybridization of the central metal ION in Y is `d^(2)sp^(3)` Addition of silver NITRATE to Y gives only TWO equivalents of silver chloride When X and Z are in EQUILIBRIUM at `0^(@)C`, the colour of the solution is pink Z is a tetrahedral complex Answer :B

85019.	Aldehyde is formed when following is hydrolysed :
Answer» ethane ethene ethyne ether. Solution :REFER to PREPARATION from ALKYNE.

85020.	Addition of excess aqueous ammonia to a pink coloured aqueous solution ofandgives an octahedral complex Y in the presence of air .In aqueous solution, complex Y behaves as 1:3 electrolyte . The reaction of X with excess HCl at room temperature results in the formation of a blue coloured complex Z. The calculated spin only magnetic moment of X and Z is 3.87 B.M whereas it is zero for complex Y. Among the following options , which statement(s) is(are) correct ?
Answer» The hybridisation of the central metal ion in Y is `d^(2)sp^(3)` Addition of silver NITRATE to Y gives only two equivalents of silver chloride When X and Z are in equilibrium at `0^(@)`C , the colour of the solution is pink Z is a TETRAHEDRAL complex. Solution :

85021.	Aldehyde having no alpha - hydrogen undergo disproportionation in presence of strongpotash to give a corresponding salt of acid and alcohol . The reaction is known as ,
Answer» Wurtz reaction Aldol CONDENSATION CANNIZZARO's reaction ESTERIFICATION Answer :C

85022.	Addition of common salt to a sample of water will
Answer» INCREASE its freezing POINT and increase the boiling point DECREASE its freezing point and increase the boiling point increase both the boiling and the freezing point decrease both the boiling and the freezing point. Solution :Addition of solute DECREASES the freezing point and INCREASES the boiling point.

85023.	Aldehyde is converted in to 1^(@) alcohol by
Answer» OXIDATION reduction hydroxylation hydrolysis Answer :B

85024.	Addition of CI_(2) to KI solution gives it a brown colour but excess of CI_(2)turns it colourless. Explain.
Answer» Solution :`Cl_(2)` being a stronger oxidising agent than `I_(2)`, FIRST oxidises KI to give `I_(2)` which imparts brown COLOUR to the solution. `2 KI (aq) + Cl_(2)(g) rarr 2 KCI(ag) + underset(("Browin"))(I_(2)(s))` If, however, `Cl_(2)` is passed in excess, the `I_(2)` THUS formed gets further oxidised to iodic acid `(HIO_(3))` which is colourless. `5 Cl_(2) + I_(2) + 6 H_(2)O rarr 10 HCI + underset(("Colourless"))(2HIO_(3))`

85025.	Addition of Cl_2 water (or HOCI) to propene gives
Answer» 1-chloro-2-propanol 2-chloro-1-propanol 3-chloro-1-propanol 1-chloro-1-propanol. Solution :`CH_3 CH= CH_2 + OVERSET(delta-)(H)O - overset(delta+)(C)l overset("MARK")underset("ADDN.")(to) underset("1-chloro-2-propanol")(CH_3CH(OH)CH_2 Cl)`

85026.	Aldehyde group is o, p-directing and activating in electrophilic substituion reactions of aromatic aldehydes.
Answer» ANSWER :F

85027.	Addition of bromine to 1,3-butadiene gives :
Answer» 1,2-addition PRODUCT only 1, 4-addition product only Both 1, 2 and 1,4-addition products No reaction Answer :C

85028.	Aldehyde group can occur,
Answer» any where in carbon CHAIN in the MIDDLE of carbon chain at only second carbon atom of carbon chain only at END of the carbon chain Answer :D

85029.	Addition of Br_2 to ethene in CCl_4 gives vic-dibromide.
Answer»

85030.	Aldehyde group can be protected
Answer» by acetal formation against attack by alkaline oxidizing agents by mercaptal formation against attack by ACIDIC oxidizing agents Both statements are correct NONE is correct Answer :C

85031.	Addition of Br_(2) to Z-but-2-ene gives:
Answer» (R,R)-2,3-dibromobutane only (S,S)-2-3-dibromobutane only (R,S)-2,3-dibromobutane only (R,S)-1,2-dibromobutane Solution :N//A

85032.	Aldehyde can be obtained by the oxidation of which of the following compound.
Answer» `R-CH_(2)-OH` `CO_(2)` ANSWER :A

85033.	Addition of Br_2 on trans-butene-2 gives:
Answer» A RACEMIC MIXTURE of 2,3-dibromo butane Meso FORM of 2,3-dibromobutane Dextro form of 2,3-dibromobutane Laevo form of 2,3-dibromobutane Answer :B

85034.	Aldehydes can be oxidised by
Answer» BENEDICT's SOLUTIONS TOLLEN's reagent Fehling's SOLUTION All of these ANSWER :D

85035.	Addition of an electron to a neutral gaseous atom alwayds leads to (i)Formation of an anion(ii)Liberation of energy(iii) Decrease in proton/electron ratio
Answer» Only (II) (i) & (ii) (i) & (III) Only (i) ANSWER :C

85036.	Aldehyde and ketones are specially susceptible susceptible to nucleophile addition because carbonyl group (due to electronegatvity different between carbon and oxygen). Positive charge on carbon makes it reactive towards the nucleophile. This addition is catalysed by acid. Reactivity of carbonyl compound towards nucleophilic addition increases in the electron deficience at carbonyl carbon. Thus, (-I.E.) group increase while (+I.E.) groups decrease the reactivity of carbonyl compound
Answer» ANSWER :A

85037.	Addition of Br_2 on cis-butene-2 gives:
Answer» A RACEMIC MIXTURE of 2,3-dibromo butane Meso FORM of 2,3-dibromobutane Dextro form of 2,3-dibromobutane Laevo form of 2,3-dibromobutane Answer :A

85038.	Aldehyde and ketones can decolourise
Answer» BROMINE water Quick lime Dil. `H_(2)SO_(4)` None of these Solution :ALDEHYDE and ketone are COLOURLESS and stable COMPOUND

85039.	Addition of appreciable amount KMnO_(4) in conc. H_(2)SO_(4) explodes. Explain.
Answer» ANSWER :`Mn_(2)O_(7)`

85040.	Aldehyde and ketones are specially susceptible susceptible to nucleophile addition because carbonyl group (due to electronegatvity different between carbon and oxygen). Positive charge on carbon makes it reactive towards the nucleophile. This addition is catalysed by acid. Reactivity of carbonyl compound towards nucleophilic addition increases in the electron deficience at carbonyl carbon. Thus, (-I.E.) group increase while (+I.E.) groups decrease the reactivity of carbonyl compound Select the least reactive carbonyl compound for nucleophilic addition:
Answer» `C_(6)H_(5)-OVERSET(O)overset(\|\|)C-C_(6)H_(5)` `C_(6)H_(5)-overset(O)overset(\|\|)C-CH_(3)` `CH_(3)-CH_(2)-overset(O)overset(\|\|)C-CH_(2)-CH_(3)` All are equally reactive. ANSWER :A

85041.	Addition of an electrolyte such as sodium dodecyl sulphate causes
Answer» RENATURATION of proteins since it stabilises HYDROPHOBIC interactions denaturation of proteins since it disturbs hydrophobic interactions renaturation of proteins since it maintains necessary ISOELECTRIC point denaturation of proteins since it CAUSES cleavage of `O = C-N-H` bonds Answer :B

85042.	Aldehyde and ketones are specially susceptible susceptible to nucleophile addition because carbonyl group (due to electronegatvity different between carbon and oxygen). Positive charge on carbon makes it reactive towards the nucleophile. This addition is catalysed by acid. Reactivity of carbonyl compound towards nucleophilic addition increases in the electron deficience at carbonyl carbon. Thus, (-I.E.) group increase while (+I.E.) groups decrease the reactivity of carbonyl compound Which among the following carbonyl compounds is most polar?
Answer» ANSWER :A

85043.	Addition of ammonium chloride to a solution containing ferric and magnesium ions is essential for selective precipitation of ferric hydroxide by aqueous ammonia.
Answer» ANSWER :T

85044.	Aldehyde and ketones are specially susceptible susceptible to nucleophile addition because carbonyl group (due to electronegatvity different between carbon and oxygen). Positive charge on carbon makes it reactive towards the nucleophile. This addition is catalysed by acid. Reactivity of carbonyl compound towards nucleophilic addition increases in the electron deficience at carbonyl carbon. Thus, (-I.E.) group 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

85045.	Addition of Alum purifies water. Why?
Answer» SOLUTION :Purification of DRINKING water is activated by coagulation of suspended IMPURITIES in water using alums containing `Al^(3+)`. That is why we are adding to purify water.

85046.	Addition of alcohols to aldehydes to presence of anydrous acids yield
Answer» CARBOXYLIC acids Ethers Cyclic ethers Acetals Solution :

85047.	Aldehyde and ketone molecules having alpha- hydrogen atoms undergo aldol condensation reaction. Aldol condensation reaction preceeds in acidic and basic conditions. In basic medium, aldol condensation product will be formed involving enolate ion formation. Here the enolate ion acts as nucleophile. Other carbonyl group containing compounds also perform similar type of reactions. overset(CH_(3)-CHO) underset("Piperidine, Pyridine")toX Final product X is
Answer» `OVERSET(HOOC-CH-COOH) overset(\|)UNDERSET(CH_(3))underset(\|)(HC)-OH` `overset (HOOC-C-COOH) overset(\|\|) (HC-CH_(3))` Solution :

85048.	Addition of a non-volatile solute in a volatile ideal solvent
Answer» Increases the vapoure pressure of the solvent DECREASES the VAPOUR pressure of the solvent Decreases the vapoure pressure of the solvent Decreases the boililng POINT of the solvent Increases the FREEZING point of the solvent Answer :B

85049.	Addition of 1 mol of B of 8 mole of A increases vapour pressure of A. If A and B form ideal soltion, then
Answer» `A` is more volatile than `B` `B` is more volatile than `A` volatility cannot be PREDICTED on the basis of the GIVEN data Lower BOILING azeotrope will be formed Solution :

85050.	Aldehyde and ketone molecules having alpha- hydrogen atoms undergo aldol condensation reaction. Aldol condensation reaction preceeds in acidic and basic conditions. In basic medium, aldol condensation product will be formed involving enolate ion formation. Here the enolate ion acts as nucleophile. Other carbonyl group containing compounds also perform similar type of reactions. Final product X is
Answer» `CH_(3)CHO` and `CH_(3)COOH` SOLUTION :

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