NAT II Biological Science Chemistry With Answers

image
image
image

NAT II Biological Science Chemistry

Sr. # Questions Answers Choice
1 The most reactive compound for electrophilic nitration will be Benzyl chloride Benzoic acid Nitrobenzene Chlorobenzene
2 What happens when CCl4is treated with AgNO3solution? NO<sub>2</sub>will be evolved A white ppt. of AgCl will form CCl<sub>4</sub>will dissolve in AgNO<sub>3</sub>solution Nothing will happen
3 Reaction of ethylamine with chloroform in alcoholic KOH produces CH<sub>3</sub>OH CH<sub>3</sub>NC C<sub>2</sub>H<sub>5</sub>NC C<sub>2</sub>H<sub>5</sub>CN
4 Ethyl chloride on treatment with aqueous alkali gives Ethane Ethene Ethanal Ethanol
5 DDT is formed from Benzene and Chlorobenzene Chloral and Chlorobenzene Chloral and benzene Chlorobenzene and chlorine
6 Which of the following with aqueous KOH will give acetaldehyde? 1, 2-Dichloroethane 1, 1-Dichloroethane Chloroacetic acid Ethyl chloride
7 Aryl halides are less reactive towards nucleophilic substitution reactions as compared to alkyl halides due to The formation of less stable carbonium ion Resonance stabilization Larger carbon -halogen bond The inductive effect
8 Carbon atom holding halogen in aryl halides is sp<sup>2</sup>-hybridesed sp<sup>3</sup>-hybridesed sp-hybridesed sp<sup>3</sup>d-hybridesed
9 Which of the following reagent cannot be used for preparing alkyl chloride from alcohol? HCl + anhyd. ZnCl<sub>2</sub> NaCl PCl<sub>5</sub> SOCl<sub>2</sub>
10 Octane number can be changed by Isomerisation alkylation Cyclisation All of these
11 The treatment of benzene with isobutene in the presence of sulphuric acid give isobutyl benzene tert-Butyl benzene n- Butyl benzene no reaction
12 Which of the following possesses the highest melting point? Chlorobenzene o- Dichlorobenzene m-Dichlorobenzene p-Dichlorobenzene
13 Which of the following species participate in sulphonation of benzene ring? H<sub>2</sub>SO<sub>4</sub> HSO<sup>-</sup><sub>3</sub> SO<sub>3</sub> SO<sup>-</sup><sub>2</sub>
14 Heating a micture of sodium benzoate and soda lime gives Benzene Methane Sodium benzoate Calcium benzoate
15 Benezene is obtained by fractional distillation of Heavy oil Anthracene oil Middle oil Light oil
16 Which species represents the electrpohile in aromatic nitrotaion? NO<sup>-</sup><sub>2</sub> NO<sup>+</sup><sub>2</sub> NO2 NO<sup>-</sup><sub>3</sub>
17 Which reaction sequence would be best to prepare 3-chloro-aniline from benzene? Chlorination, nitration, reduction Nitration, Chlorination, reduction Nitration, reduction, chlorination Nitration, reduction, acylation, chorination, hydrolysis
18 Most common reactions of benzene and its derivatives are Electrophilic addition reactions Electrophilic subsitution reactions Nucleoophilic addition reactions Nucleophilic substitution reactions
19 The reaction/method that does not give an alkane is Catalytic hydrogenation of alkanes Wurtz reaction Hydrolysis of alkyl magnesium bromide Dehydrohalogenation of an alkyl halide.
20 Which of the following method is most appropriate for the manufacture of methane? By reduction of CH2SL2 Wurtz reaction Liquification of natural gas None of these
Download This Set

Is this page helpful?

×