This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 84951. |
Addition of K_4[Fe(CN)_6] solution to FeCl_3 solution give |
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Answer» Ferro-Ferricyanide |
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| 84952. |
Aldehydes and ketones differ in their chemical reactions. How do they with the following.? Alcohol |
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Answer» |
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| 84953. |
Addition of hypochlorous acid to propyne gives : |
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Answer» Dichloroacetaldehyde |
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| 84954. |
Aldehydes and ketones differ in their chemical reactions. How do they with the following.? Tollens's reagent |
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Answer» |
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| 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 |
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Answer» I,II,iii |
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| 84956. |
Aldehydesand ketonesform addition products with |
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Answer» HYDROGEN cyanide |
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| 84957. |
Addition of high proportions of manganeses make steel useful in making rails of railroads, because manganese |
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Answer» Gives hardness to steel `Fe_(2)O_(3)+3Mnrarr2MnO+2Fe` `MnO+SiO_(2)rarrunderset("(Slag)")(MnSiO_(3))` |
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| 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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Answer» A more STABLE CARBONIUM ion
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| 84959. |
Aldehydes and ketones canbe distinguished by using. |
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Answer» TOLLEN's reagent 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 |
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| 84960. |
Addition of HI on double bond of propene yields isopropyl iodide as major product. It is because the addition proceeds through: |
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Answer» More STABLE carbocation |
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| 84962. |
Addition of HCN to ethyne in presence of Ba(CN)_(2) as catalyst gives |
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Answer» 1, 1-dicyanoethane |
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| 84964. |
Aldehydes and ketones can be subjected to Clemmensen reduction and Wolf-Kishner reduction. Name the reagents used in both cases. |
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Answer» Wolf-Kishner reduction-Hydrazine, KOH, Diethylene GLYCOL |
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| 84965. |
Aldehydes and ketones can be reduced to corresponding hydrocarbons by __________. |
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Answer» Refuxing with water
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| 84966. |
Aldehydes and ketones can be reduced to hydrocarbon by using |
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Answer» `LiAIH_(4)` |
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| 84967. |
Addition of HCl to 2-methyl-2-butene mainly gives |
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Answer» 1-chloro-2-methylbutane |
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| 84968. |
Addition of HCl does not obey anti-Markovnikov's rule because |
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Answer» It is a STRONG acid |
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| 84969. |
Addition of HBr to an alkene in the presence of peroxides follows : |
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Answer» Nucleophilic ADDITION |
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| 84970. |
Why aldehydes and ketones show nucleophilic addition reaction? |
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Answer» HCN |
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| 84971. |
Addition of HBr occurs most readily for |
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Answer» `CH_2=CHCl` |
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| 84973. |
Addition of HBr to 2-methyl propene in the presence of peroxide mainly forms : |
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Answer» 2-Bromopropane <BR>1-Bromopropane |
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| 84975. |
Addition of HBr gives sameproduct in the presence or absence of peroxide when alkene is |
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Answer» 1-butuene |
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| 84976. |
Aldehydes and ketones are reduced to hydrocarbons by zinc amalgam and conc. HCl. This is _______ reaction. |
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Answer» Clemmenson's reduction |
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| 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. |
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Answer» |
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| 84979. |
Addition of halogen acid occurs at slowest rate in : |
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Answer» `CH_2 = CHCI` |
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| 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 ? |
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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. |
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| 84981. |
Aldehydes and ketones are reduced to hydrocarbon by the action of .... |
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Answer» `LiAlH_4` |
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| 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. .
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| 84983. |
Aldehydes andketonesare obtainedby theactionofsulphuriseacid onsodiumsalt of ________ formalkyl nitrate . |
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Answer» Nitro form
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| 84984. |
Addition of Grignard reagent to carbonyl compounds results into which alcohol ? |
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Answer» `1^(@)`
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| 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.
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| 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? |
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Answer»
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| 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 |
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Answer» PEPTIZATION |
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| 84989. |
Aldehydes and ketones are collectively known as _____. |
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Answer» alcohols |
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| 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? |
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Answer» `CH_(3)-CH_(2)-CH_(2)-CH_(2)-OVERSET(O)overset(||)C-H` |
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| 84991. |
Addition of excess potassium iodide solution to a solution of mercuric chloride gives the halide complex |
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Answer» tetrachedral `K_(2) [HgI_(4)]` `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%"> |
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| 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 : |
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Answer» HCN |
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| 84993. |
Addition of FeCl_3 to K_4Fe(CN)_6 gives : |
| Answer» Answer :D | |
| 84994. |
Aldehydes and ketone will not form crystalline drivatives with |
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Answer» sidumbisulphite |
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| 84995. |
Addition of excess of sodium hydroxide solution to stannous chloride solution, we obtain: |
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Answer» `SN(OH)_2` |
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| 84996. |
Aldehydes and ketone are |
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Answer» tautomers |
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| 84997. |
Aldehydes and ketone reacts with Grignards reagent gives |
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Answer» MIXTURE of `1^@`, `2^@`, `3^@` alcohols |
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| 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 |
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Answer» `1:1` electrolyte |
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| 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 |
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Answer» `CH_(3)CH_(2)-` |
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| 85000. |
Aldehyde with NH_(2) - NH_(2) forms |
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Answer» ANILINE |
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