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Mdcat-past-papers - UHS - Chemistry Quiz

Filters: Board: UHS | Subject: Chemistry |
261. Which mechanism of reactions is shown by carbonyl compounds?



262. Which of the following would react with ozone in the atmosphere?



263. When halogen is removed from an alkyl halide a carbocation is formed, Identify the most reactive carbocation:



264. Freon is commonly known as:



265. Neopentyl chloride belongs to which class of alkyl halides?



266. In SN1 reaction the correct order of reactivity of alkyl halides is?



267. Identify the correct ascending order of reactivity of alkyl halides:



268. When purely alcoholic solution of sodium/potassium hydroxide and halogenoalkanes are reacted an alkene is formed. What is the mechanism of reaction?



269. The alkaline hydroxides of bromoethane shown below gives alcohol as the product: CH₃—CH₂—Br → CH₃—CH₂—OH The reagent and the condition used in the reaction is:



270. In substitution reactions, dihaloalkane or secondary halogenoalkane give/show:



271. Consider the reaction given below: Which statement is true?



272. In the below reaction, the configuration of product is:



273. Consider the reaction given below: CH₃CH₂Br → H₂C=CH₂ + HBr Mechanism followed by the reaction is:



274. The species which are produced by heterolytic bond breaking and can act as electron pair donors are known as:



275. Which of the following acts as a nucleophile in the reaction of alkyl halide with alcoholic aqueous solution?



276. What is the order of increasing reactivity of alkyl halides?



277. The decomposition of phosphorus pentachloride in the presence of moisture takes place by the following mechanism: PCL5+H2O→POCL3+2HCL (slow step) POCL3+3H2O→H3PO4+3HCL (Fast step) Result = PCL5 +4H2O→ H3PO4+5HCl the rate equation for this reaction will be:



278. In the reaction sequence CH₃−CH₂−CH₂−Br + Alc KOH → C → D, Product D will be:



279. Which balanced chemical equation shows the formation of ethyl chloride using thionyl chloride?



280. The increasing stability order of the following compounds (1) CH₃CH₂CH₂⁺ (2) (CH₃)₃C⁺ (3) CH₃CH₂−CH⁺−CH₃ are:



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