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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.
| 84551. |
All carbonates in alkali metals are |
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Answer» 1 |
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| 84552. |
All carbon atom present in KH_(3)(C_(2)O_(4) )_(2).2H_(2)O weighing 762 gm is converted to CO_(2).How many gm of CO_(2) were obtained. |
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Answer» |
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| 84553. |
All but one of the following compounds reacts with aniline to give acetanilide. Which one does not? |
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Answer» `CH_(3)OVERSET(O)overset(||)C-Cl` |
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| 84555. |
All bonds in SF_(4) are not equivalent. Comment. |
| Answer» SOLUTION :S in `SF_(4)` is `sp^(3)` d-hybridized. Therefore, `SF_(4)` has trigonal bipyramid structure or see-saw GEOMETRY. Two of the S-F bonds occypy equatorial positions and are 155 pm LONG while the third equatorial position is occupied by a lone pair of electrons. The remaining two S-F bonds occypy axial positions and are little longer (165 pm) due to repulsions between the axial bond pairs and the equatorial lone pair. Thus, all the four S-F bonds in `SF_(4)` are not equivalent. | |
| 84556. |
All bonds in benzene are equal due to : |
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Answer» Tautomerism |
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| 84557. |
All bond angles are exactly equal to 109^(@) 28' in: |
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Answer» methyl chloride |
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| 84558. |
All axial distances are unequal as well as all axial angles are unequal in the system |
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Answer» MONOCLINIC |
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| 84559. |
All ammonium salt liberate ammonia when |
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Answer» Heated with HCI |
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| 84560. |
All amines have general formula |
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Answer» `C_(N)H_(2n)NH_(2)` |
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| 84561. |
All amines are basic in nature because |
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Answer» they possess ONE pair of electron on nitrogen |
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| 84562. |
All alumns contain |
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Answer» ONE MONOVALENT and one TRIVALENT metal |
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| 84563. |
All aminesaresoluble in |
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Answer» WATER |
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| 84564. |
Describe reaction of alkaline earth metals with acids. |
| Answer» | |
| 84565. |
All alkali metals dissolve in anhydrous liquid ammonia to give blue colour solution. It is the ammoniated electron whichis reponsible for the blue colour of the solution, and the electrical conductivity is due to the ammoniated cation, [M(NH_(3))_(x)]^(+) as well as the ammoniated electron, [e(NH_(3))_(y)]^(-), value of x and y depend on the extent of solvation by NH_(3). Dilute solutions are paramagnetic due to free ammoniated electrons. Q.Ammoniated solutions of alkali metals are reducing agents due to the presence of free ammoniated or solvated electrons that can reduce: (I)O_(2) "to" O_(2)^(2-)(II) K_(2)[Ni(CN)_(4)] " to "K_(4)[Ni(CN)_(4)] (III) Aromatic ring(IV) Non-terminal alkyne Choose the correct code: |
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Answer» III and IV ammoniated `overline(e)` responsible for blue colour and reducing character. If conc. Of solution is increased, then ASSOCIATED of solvated electrons gas started hence, paramagnetism DECREASE and solution changes to BRONZE colour. |
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| 84566. |
How alkaline earth metal dissolve in liquid ammonia ? |
| Answer» | |
| 84567. |
All alkali metals crystallize into BCC strucutres. (a) Find an equation relating the metallic radius to the density of a BCC solid in terms of its molar mass. (b) Determine the relative size of Cs atom compared to a Li atom, if their densities are 1.87 g/cc and 0.53 g/cc, respectively. |
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Answer» Solution :(a) For a BCC solid of an element, there are two atoms per UNIT cell. `implies` Density (rho)=(2xxM)/(6.023xx10^(23)a^(3))` Also, in BCC of an atomic solid, `rho=(2Mxx3sqrt(3))/(6.023xx10^(23)xx64r^(3))=2.696xx10^(-23)(M)/(r^(3))` (B)`(rho_(Cs))/(rho_(LI))=(1.87)/(0.53)=(133)/(7)(r_(Li)/(r_(Cs)))^(3)` `(r_(Cs))/(r_(Li))=1.753 implies r_(Cs)=1.753 r_(Li)` |
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| 84568. |
All aliphatic amines are more basic than ammonia but due to delocalization of lone pair of electrons of the nitrogen atom on the benzene ring, aniline is a weaker base than ammonia. The basic strength of the substituted anilines, however, depends upon the nature of the substituents. Whereas electron-donating groups tend to increase, electron-withdrawing groups tend to decrease the basic strength. the base strenghening effect of the electron-donating groups and base weakening effect of the electron-withdrawing groups is, however, more pronounced at p-than at m-position. However, due to ortho effect, o-substituted anilines are weaker bases than anilines regardless of the nature of substituent whether electron-donating or electron-withdrawing. Q. Among the following, the weakest base is |
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Answer» `C_(6)H_(5)NH_(2)` |
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| 84569. |
All aliphatic amines are more basic than ammonia but due to delocalization of lone pair of electrons of the nitrogen atom on the benzene ring, aniline is a weaker base than ammonia. The basic strength of the substituted anilines, however, depends upon the nature of the substituents. Whereas electron-donating groups tend to increase, electron-withdrawing groups tend to decrease the basic strength. the base strenghening effect of the electron-donating groups and base weakening effect of the electron-withdrawing groups is, however, more pronounced at p-than at m-position. However, due to ortho effect, o-substituted anilines are weaker bases than anilines regardless of the nature of substituent whether electron-donating or electron-withdrawing. Q. What is the order of basicity of I. p-methylaniline II. m-methylaniline III. aniline IV. o-methylaniline. |
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Answer» IgtIIgtIIIgtIV |
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| 84570. |
All aliphatic amines are more basic than ammonia but due to delocalization of lone pair of electrons of the nitrogen atom on the benzene ring, aniline is a weaker base than ammonia. The basic strength of the substituted anilines, however, depends upon the nature of the substituents. Whereas electron-donating groups tend to increase, electron-withdrawing groups tend to decrease the basic strength. the base strenghening effect of the electron-donating groups and base weakening effect of the electron-withdrawing groups is, however, more pronounced at p-than at m-position. However, due to ortho effect, o-substituted anilines are weaker bases than anilines regardless of the nature of substituent whether electron-donating or electron-withdrawing. Q. Among the following, weakest base is |
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Answer» `C_(6)H_(5)CH_(2)NH_(2)` |
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| 84571. |
All aliphatic amines are more basic than ammonia but due to delocalisation of lone pair of electrons of the nitrogen atom on the benzene ring, aniline is a weaker base than ammonia. The basic strength of the substituted anilines, however, depends upon the nature of the substituent whereas electron donating group tend to increase, electron-with drawing groups tend to decrease the basic strength. The base trengthening effect of the electron-donating group and the base weaken effect of the electron withdrawing group is, however, more pronouned at p-than at m-position. However due to ortho effect, o-substituted anilines are weaker bases than anilines regardless of the nature of substituent whether electron-donating or electron withdrawing. Select the weakest base among the following |
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Answer» `C_(6)H_(5)CH_(2)NH_(2)` |
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| 84572. |
All aliphatic amines are more basic than ammonia but due to delocalisation of lone pair of electrons of the nitrogen atom on the benzene ring, aniline is a weaker base than ammonia. The basic strength of the substituted anilines, however, depends upon the nature of the substituent whereas electron donating group tend to increase, electron-with drawing groups tend to decrease the basic strength. The base trengthening effect of the electron-donating group and the base weaken effect of the electron withdrawing group is, however, more pronouned at p-than at m-position. However due to ortho effect, o-substituted anilines are weaker bases than anilines regardless of the nature of substituent whether electron-donating or electron withdrawing. Choose among the following amines the correct decreasing order of their basic strength |
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Answer» `I GT II gt III gt IV` |
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| 84573. |
All aliphatic amines are more basic than ammonia but due to delocalisation of lone pair of electrons of the nitrogen atom on the benzene ring, aniline is a weaker base than ammonia. The basic strength of the substituted anilines, however, depends upon the nature of the substituent whereas electron donating group tend to increase, electron-with drawing groups tend to decrease the basic strength. The base trengthening effect of the electron-donating group and the base weaken effect of the electron withdrawing group is, however, more pronouned at p-than at m-position. However due to ortho effect, o-substituted anilines are weaker bases than anilines regardless of the nature of substituent whether electron-donating or electron withdrawing. The correct order of increasing basic nature of the following bases is |
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Answer» `2 gt 1 lt 3 lt 4` |
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| 84574. |
All aldehdes can made to undergo the Cannizzaro reaction by treatment with aluminium ethoxide. Under these conditions, the acid and alcohol are combined to form an ester. The reaction is called |
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Answer» Claisen REACTION |
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| 84575. |
All allums contain |
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Answer» ONE MONOVALENT and one TRIVALENT metal |
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| 84576. |
How 1^@ amine reacts with nitrous acid ? |
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Answer» |
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| 84577. |
All adsorptions are exothermic. Explain. |
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| 84578. |
Alkynes undergo acid catalysed addition of water across the triple bond in the presence of mercuric ion as catalyst. A mixture of HgSO_(4) and aqueous H_(2)SO_(4) is used and addition product follows Markownikoff's rule R-C-=CH+H_(2)O underset(H_(2)SO_(4)"Step 1")overset(HgSO_(4))toR-underset(OH)underset(||)(C)=CH_(2) underset("Step 2")to underset("Step 2")to R-underset("Ketone")underset(O)underset(||)(C CH_(3) Hydration of 2 pentyne by a mixture of HgSO_(4) and H_(2)SO_(4) forms |
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Answer» 2-pentanone |
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| 84579. |
All 1° amines on diazotisation with NaNO_2(s) and HCl(aq) at low temperature give diazonium salts. |
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Answer» |
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| 84580. |
Alkynes undergo acid catalysed addition of water across the triple bond in the presence of mercuric ion as catalyst. A mixture of HgSO_(4) and aqueous H_(2)SO_(4) is used and addition product follows Markownikoff's rule R-C-=CH+H_(2)O underset(H_(2)SO_(4)"Step 1")overset(HgSO_(4))toR-underset(OH)underset(||)(C)=CH_(2) underset("Step 2")to underset("Step 2")to R-underset("Ketone")underset(O)underset(||)(C CH_(3) Select the correct statement(s) |
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Answer» Enol form is the hydration of alkyne is called vinyl alcohol |
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| 84581. |
Alkynes can be reduced to alkenes hydrogenation in presence of: |
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Answer» Rancy Ni |
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| 84582. |
Alkynes (A) and (B) hav ethe molecular formula C_(8)H_(14) giving following reactions: (A) or (B) overset(H_(2)//Pt)rarr "n-Octane". (A) overset(O_(3)//H_(2)O)rarr CH_(3)CH_(2)CH_(2)CO_(2)H (B) overset(Ag(NH_(3))_(2)OH)rarr silver containing white ppt. Write the structure of (A) and (B). |
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Answer» `A overset(O_(3)//H_(2)O)rarr CH_(3)CH_(2)CH_(2)CO_(2)H` ("and no other compound") Hence, there should be two mole of this ACID. THUS `A` is `CH_(3)CH_(2)CH_(2)C-=C CH_(2)CH_(2)CH_(3)` `B` gives white PPT. containing `Ag` hence, `B` is terminal alkyne. Structure of `B` is `CH_(3)CH_(2)CH_(2)CH_(2)CH_(2)CH_(2)C-=CH` |
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| 84583. |
Alkyl substituted chlorosilane, R_n SiCl_((4-n)), on hydrolysis and then condensation polymerisation yield silicones What is the value of n is the alkyl substituted chlorosilane used for the preparation of cross linked silicone. |
Answer» 
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| 84584. |
Alkyl nitrite on reduction withSn//HCl gives : |
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Answer» Alcohol |
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| 84585. |
Alkyl isocyanides (Roverset(o+)(N)-=overset(ɵ)(C )) are reduced to 2^(@) amines (R-NH-CH_(3)) with: |
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Answer» a.`LAH` |
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| 84586. |
Alkyl isocyanides can be converted into cyanides by ..... |
| Answer» SOLUTION : PROLONGED HEATING | |
| 84587. |
Alkyl iodides are often prepared by the reaction of alkyl chlorides/bromides with Nal in dry acetone. This reaction is known as |
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Answer» WURTZ REACTION . |
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| 84588. |
Alkyl iodides reacts with NaCN to form alkyl cyanides plus a little amount of alkyl isocyanides. The reason for the formation two types of products is- |
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Answer» Ionic CHARACTER of NaCN |
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| 84589. |
Alkyl Iodide can be prepared by |
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Answer» `R -CH_2COOAg + I_2 overset("CCl"_4)(to)` `a) R - CH_2COOAg + I_2 overset("CCl"_4)(to) R- CH_2 - I + CO_2 + AGI` `b) R - CH_2 - Cl +NaI to NaCl + R - CH_2 - I` these RXN is a Frankelstain RXn `c) R - OH + HI to R - I + H_2O` |
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| 84590. |
Alkyl isocyanide on reduction withZn-Hg//HClgives |
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Answer» Primary amine |
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| 84591. |
Alkyl iodide react with NaCN to give alkyl cyanide and small amount of alkyl isocyanide. Formation of these two product is due to the |
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Answer» Ionic character of NaCN `R-Ioverset(NaCN)tounderset("MAJOR")(RCN)+underset("Minor")(RNC)`. |
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| 84592. |
Alkyl halides undergoing substitution nucleophilic bimolecular reaction involves |
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Answer» Formation of carbocation 
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| 84593. |
Alkyl halides undergo elimination when heated with strong base. A concerted reaction in which both the groups to be eliminated, leave silumtaneously is E2 reaction. In another case ionization of alkyl halide takes place losing X^(-) and forms carbocation in the first stage followed by the loss of H^(+) . this is substituted alkene) and Hofmann (less substituted alkene) are formed depending on the condition of the reaction. Q. Which of the following is not correct regarding E2 reaction? |
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Answer» KINETIC isotopic effect is observed. |
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| 84594. |
Alkyl halides undergo elimination when heated with strong base. A concerted reaction in which both the groups to be eliminated, leave silumtaneously is E2 reaction. In another case ionization of alkyl halide takes place losing X^(-) and forms carbocation in the first stage followed by the loss of H^(+) . this is substituted alkene) and Hofmann (less substituted alkene) are formed depending on the condition of the reaction. Q. Identify the reaction the reaction in which Hofmann product could be the major product? |
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Answer» 2-fluorohexane `underset(C_(2)H_(5)OH)OVERSET(C_(2)H_(5)O^(-))to` |
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| 84595. |
alkyl halides, though polar, are immiscible with water? |
| Answer» Solution :Since the new forces of attraction between WATER and alkyl halide molecules are WEAKER than the forces of attraction already existing between alkyl halide-alkyl halide molecules and water-water molecules. Therefore, alkyl HALIDES are immiscible (not SOLUBLE) with water. | |
| 84596. |
Alkyl halides reacts with dialkyl copper reagents to give (A). The reaction is called B,(A) and (B) are : |
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Answer» alkenes, corey HOUSE synthesis `R_(2)CuLi+R'XtoR R'Rcu+LiX` |
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| 84597. |
Alkyl halides react with sodium in dry ether to give hydrocarbons containing _________ the number of carbon atoms present in the halide. |
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Answer» |
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| 84599. |
Alkyl halides react with lithium dialkyl copper reagents to give : |
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Answer» alkenes |
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| 84600. |
Alkyl halides react with dialkyl copper reagents to give: |
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Answer» Alkenes |
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