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(A) Benzonitrile is prepared by the acti...

(A) Benzonitrile is prepared by the action of chlorobenzene with KCN
(R) Cyanide ion (CN) is a weak nucleophile 

A

Both (A) and (R) are correct and (R) is the correct explanation of (A)

B

Both (A) and (R) are correct but (R) is not the correct explanation of (A)

C

(A) is True but (R) is False

D

Both (A) and (R) are false

Text Solution

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The correct Answer is:
D
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In octahedral complexes having co-ordination number 6, the degeneracy of the d-orbitals of central atom is removed due to ligand electron metal electron repulsions. In the octahedral complex three orbitals have lower energy, t_(2g) set and two orbitals have higher energy, eg set. This phenomenon is formed as crystal field splitting and the energy seperation is denoted by Delta_(0) . Thus the energy of the two eg orbitals will increase by (3//5)Delta_(0) and that of the three t_(2g) will decrease by (2//5)Delta_(0) . The erystal field splitling, Delta_(0) depends upon the field produced by the ligand and charge on the metal ion. Some ligands are able to produce strong field and in these cases, the splitting will be large whereas other produce weak fields and consequently result in small splitting of d-orbitals. Predict the order of Delta_(0) for the following compound i) [Fe(H_(2)O)_(6)]^(+2) ii) [Fe(CN)2(H_(2)O)_(4) iii) [Fe(CN)_(4)(H_(2)O)_(2)]^(2-)

(A) KCN reacts with methyl chloride to give methyl cyanide and methyl isocyanide as products (R) CN^(-) is an ambident nucleophile.

(A) n-propyl alcohol is prepared from propene by the action of B_2H_6 followed by oxidation with H_2O_2 in basic medium (R) In Hydroboration oxidation reaction, rearranged products are not formed because it involves the formation of cyclic transition state

(A): p-Nitrochlorobenzene is more reactive than chlorobenzene in nucleophilic substitution reactions. (R): Electron withdrawing groups like - NO_2 , increase the reactivity of haloarenes in nucleophilic substitution.

(A) Methoxy benzene can be prepared by the reaction of C_6H_5 ONa and CH_3 Br but not by the reaction of C_6H_5Br with CH_3 ONa (R) C_6H_5-Br is not a good substrate for SN? reaction because attack of nucleophile from back side of leaving group is hindered by the ring and also double bond character will be developed between carbon and bromine

(A) Tertiary alcohols are more reactive for nucleophilic substitution reactions (R) The C-O bond is weak in tertiary alcohol

The weak acids undergo partial ionisation is aqueous medium. However the dissociation of weak acids is suppressed by presence of common ions. But the Ka value of the acid remains constant irrespective of extent of dissociation What is [CN^(-)] J in a solution prepared by mixing 100ml 0.1M KCN and 100 ml 0.1 M HCl ? (K_(a) of HCN= 5xx 10^(-6) )

(A) To prepare ter.butylethylether, the reactants used are ter.butylbromide and ethoxide solution (R) Williamson's synthesis is an electrophilic substitution reaction of RX with alkoxide ion

The products of bond breaking, shown below, are not stable, and cannot be isolated for prolonged study. Such species are referred to as reactive intermediate, and are belived to be transient intermediates in many reactions. The general structures and names of four such intermediates are, Charged Intermediates Uncharged Intermediates Carbocations (called carbonium ions in the older literature) are electrophiles and carbananions are nucleophiles. Carbenes have only a valence shell sextet of electrons and are therefore electron deficient. In this sense they are elecrophiles, but the non-bonding electron pair also gives carbenes nucleophilic character. As a rule, the electrophilic character dominates carbene reactivity. Carbon radicals have only seven valence electrons, and may be considered electron deficient, however, they do not in general bond to nucleophilic electron pair, so their chemistry exhibits differences from that of conventional electrophiles. Radical intermediates are often called free radicals. Intermediates are in general stabilised with conjugation, electron donating and electron with drawing groups. R-N^(+) equiv N" "Cl^(-) rarr R^(+)+N_(2)+Cl^(-) based on the above, which of the following from R^(+) most readily

The products of bond breaking, shown below, are not stable, and cannot be isolated for prolonged study. Such species are referred to as reactive intermediate, and are belived to be transient intermediates in many reactions. The general structures and names of four such intermediates are, Charged Intermediates Uncharged Intermediates Carbocations (called carbonium ions in the older literature) are electrophiles and carbananions are nucleophiles. Carbenes have only a valence shell sextet of electrons and are therefore electron deficient. In this sense they are elecrophiles, but the non-bonding electron pair also gives carbenes nucleophilic character. As a rule, the electrophilic character dominates carbene reactivity. Carbon radicals have only seven valence electrons, and may be considered electron deficient, however, they do not in general bond to nucleophilic electron pair, so their chemistry exhibits differences from that of conventional electrophiles. Radical intermediates are often called free radicals. Intermediates are in general stabilised with conjugation, electron donating and electron with drawing groups. R-N^(+) equiv N" "Cl^(-) rarr R^(+)+N_(2)+Cl^(-) based on the above, which of the following from R^(+) most readily

AAKASH SERIES-ALKYL AND ARYL HALIDES-OBJECTIVE EXERCISE - 4 (ASSERTION (A) & REASON (R) TYPE QUESTIONS)
  1. (A) Towards SN2 reaction, order of reactivity is CH3Br > CH3CH2Br > (C...

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  2. (A) Pure chloroform does not give precipitate with AgNO3 solution. (...

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  3. (A) Addition of bromine to 2-butene yields 2,3-dibromobutane. (R) Br...

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  4. (A) Thionyl chloride reacts with primary alcohols to form pure alkyl h...

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  5. (A) The boiling points of alkyl halides decrease in the order RI > RBr...

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  6. (A) KCN reacts with methyl chloride to give methyl cyanide and methyl ...

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  7. (A) In monohaloarenes, further electrophilic substitution occurs at or...

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  8. (A) Benzonitrile is prepared by the action of chlorobenzene with KCN ...

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  9. (A) Styrene on reaction with HBr gives 1-bromo-1-phenyl ethane. (R) ...

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  10. (A) NBS is a specific reagent for allylic bromination (R) Allylic br...

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  11. (A) Benzyl bromide when kept in acetone - water, produces benzyl alcoh...

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  12. (A) 2-Bromobutane on reaction with sodium ethoxide in ethanol gives 1-...

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  13. (A) Chloral reacts with phenyl chloride to form DDT (R) It is an ele...

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  14. (A) CH3overset(Cl)overset(|)(C)HCH2CH3overset(Alc.KOH)(rarr)CH3CH=CHCH...

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  15. (A) Addition of HBr on but-2-ene gives two structural isomeric product...

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  16. (A) The nature of the solvent can influence the rotation of plane pola...

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  17. (A) SN2 reactions are exothermic (R) SN2 reactions are thermochemica...

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  18. (A) Chloroform can be used as general anaesthetic. (R) In presence o...

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  19. (A) Ethyl chloride gives C2H5CN as major product with alc. KCN but C2H...

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