5. Which of the following alkyl halides gives the SN2 reaction the fastest? a. C. -Br a. Z- b. cis- c. E- d. trans- b. 6- In which case the order of boiling points of the organic molecules given below is correctly? CH3CH₂F CH₂CH3 CH₂CH₂Cl a. CH₂CH₂ CH3CH₂F> CH3CH₂I> CH₂CH₂Cl b. CH3CH₂I >CH3CH₂Cl > CH3CH₂F> CH3CH3 c.CH3CH3> CH3CH₂F> CH3CH₂CI> CH₂CH₂I d. CH3CH₂F >CH3CH₂Cl>CH3CH₂I> CH3CH3 H₂C a. Dehydration b. Saponification c. Esterification d. Neutralization d. HO 7. In which case the configuration of the following compound is given correctly? Br CH3 Br CH₂OH CH₂CH₂I 8. The reaction of carboxylic acids with alcohols. catalysed by conc. H₂SO4 is called 9. Which of the following reagents should be used to perform the following reactions? a. b. c. d. H₂ a. b. C. H₂ d. OH 71 i K₂Cr2O7, H₂SO4 PCC, CH₂Cl₂ KMnO4, H₂SO4 PCC, CH₂Cl2 10. In which reactions are the reagents appropriate to the question mark given correctly in the following reactions? OH OH OH A H2O/Ht H₂O H₂O/H* H₂ KMnO4, OH'cold H₂ ii LIAIH4 KMnO4, H₂SO4 PCC, CH₂Cl₂ PCC, CH₂Cl₂ B KMnO4, OH, heat KMnO4, OH cold KMnO4, OH cold H₂O/H 11. Which of the following statements is correct for alkyl halide? a. Alkyl halide will always show SN1 mechanism b. As branching at carbon increases, El mechanism is favoured as compared to SN1 mechanism c. In unimolecular reaction, increasing the temperature do not favours E mechanism d. In most unimolecular reactions of alkyl halide E1

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Aromatic Compounds

Aromatic organic compound or aromatic system is an important class of hydrocarbons under the branch of organic chemistry. Aromatic compounds are also called arenas. The definition of aromatic organic compounds can be stated as a class of organic compounds with a planar cyclic ring of atoms bonded through alternated single and double bonds. Due to these alternating bonds, a peculiar feature termed as ‘resonance’, that is, delocalization of pi electrons or the electrons is shared within the atoms of the ring which are present in the aromatic compounds. The word ‘aromatic’ includes a Greek word ‘aroma’ which means smell, indicating that they were named as such due to the sweet odor they produce. Many well-known flavors such as vanilla, cinnamon, and few scents from flowers are extracted from aromatic compounds. Benzene with chemical formula C6H6 is a very common aromatic compound that contains six atoms of carbon held in the cyclic ring of alternate double bonds. It is also to be noted that not all aromatic compounds contain benzene ring. This can be explained by Huckel’s rule.