NAT I Engineering Chemistry With Answers

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NAT I Engineering Chemistry

Sr. # Questions Answers Choice
1 Carbon atom holding halogen in aryl halides is Sp<sup>2</sup>-hybridesed <span style="font-size: 14.44444465637207px;">Sp</span><sup>3</sup><span style="font-size: 14.44444465637207px;">-hybridesed</span> <span style="font-size: 14.44444465637207px;">Sp</span><span style="font-size: 14.44444465637207px;">-hybridesed</span> <span style="font-size: 14.44444465637207px;">Sp</span><sup>3&nbsp;</sup><span style="font-size: 14.44444465637207px;">d -hybridesed</span>
2 Which of the following reagent cannot be used for preparing alkyl chloride from alcohol? HCI + anhyd. ZnCI<sub>2</sub> NaCI PCI<sub>5</sub> SOCI<sub>2</sub>
3 Octane number can be changed by Isomerisation Alkylation Cyclisation All of these
4 The treatment of benzene with isobutene in the presence of sulphuric acid give Isobutyl benzene Tert-Butyl benzene n-Butyl benzene no reaction
5 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>
6 Heating a micture of sodium benzoate and soda lime gives Benzene Methane Sodium benzoate Calcium benzoate
7 Benzene is obtained by fractional distillation of Heavy oil Anthracene oil Middle oil Light oil
8 Which species represents the electrophile in aromatic nitrotaion? NO<sup>-</sup><sub>2</sub> +<div>NO<sub>2</sub></div> NO2 <span style="font-size: 14.44444465637207px;">NO</span><sup>-</sup><sub>3</sub>
9 Benzene + Ozone → Y. in this sequence Y is Benzene monoozonide Benzene diozonide Benzene triozonide Succinic acid
10 Most common reactions of benzene and its derivatives are Electrophilic addition reactions Electrophilic substitution reactions. Nucleophilic addition reactions Nucleophilic substitution reactions
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