[1] Benzyne is reactive intermediate because of:
(A) It is short lived and more reactive ☑️
(B) It possess minimum potential energy
(C) It is always invisible during reaction
(D) It possess perpendicular reactive π-bond
[2] The mechanism of nucleophilic aromatic substitution reaction based on elimination-addition is:
(A) SN2 meachanism
(B) Benzyne mechanism ☑️
(C) SN1 mechanism
(D) SNAr mechanism
[3] The benzyne reactive intermediate species classified as:
(A) Aromatic ☑️
(B) Non-aromatic
(C) Anti-aromatic
(D) Non-benzinoid aromatic
[4] The benzyne mechanism mostly carried out in protic solvent because of:
(A) Finally it receive proton from carbanion☑️
(B) Finally it donate proton to carbanion
(C) It helpful to produce reactive intermediate
(D) It increased the rate of reaction
[5] Among the following most reactive bond present in benzyne reactive intermediate is:
(A) Ethylinic π-bond
(B) Ethelinic π-bond
(C) Benzynic π-bond
(D) Benzylinic π-bond☑️
[6] Nucleophilic aromatic substitution (SN2) is slow reaction because of:
(A) Substrate : very weak electrophile ☑️
(B) Distortion in transition state
(C) Repelsion between leaving group and nucleophile
(D) Steric hindrance
[7] Ambident nucleophile meance ……
(A) Only one nucleophilic centre
(B) Two similar nucleophilic centres
(C) Possess no nucleophilic centre
(D) Two different nucleophilic centres☑️
[8] Von-Ritcher rearrangement is the example of :
(A) Intra-molecular rearrangement
(B) [2,3]-Sigmatropic rearrangement
(C) Inter-molecular rearrangement
(D) Nucleophilic aromatic cine substitution☑️
[9] SRN1 reaction meance………….
(A) Radical nucleophilic substitution unimolecular ☑️
(B) Random nucleophilic substitution unimolecular
(C) Racemic nucleophilic substitution unimolecular
(D) Nucleophilic substitution reaction unimolecular
[10] Which among the following is most reactive against nucleophilic aromatic substitution ?
(A)C6H5Cl
(B)C6H5NO2☑️
(C)C6H5OCH3
(D)C6H5NH2
[11] Condensation reaction is the reverse of which of the following reaction?
(A) lock and key hypothesis
(B) oxidation
(C) hydrolysis ☑️
(D) glycogen formation
[12] Condensation reaction always results in the formation of complex sugar (disaccharide or polysaccharide) and which of the following?
(A) amino acids
(B) lipids
(C) water ☑️
(D) maltose
[13] In which condensation an enol or an enolate ion reacts with a carbonyl compound to form a β-hydroxyaldehyde or β-hydroxyketone (an aldol reaction), followed by dehydration to give a conjugated enone happens?
(A) Aldol condensation ☑️
(B) Claisen reduction
(C) Henry condensation
(D) Knoevenagel condensation
Best work sir
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