6. Which one of the followi sulfuric acid? ing alcohols would dehydrate most rap
ID: 579676 • Letter: 6
Question
6. Which one of the followi sulfuric acid? ing alcohols would dehydrate most rapidly when treated with OH I Q a. I c, 7. Which is NOT true about carbonyl compounds? a. The C-O bond consists of 2 electrons in a sigma bond and 1 electron in a pi bond. b. The carbonyl carbon atom is sp2 hybridized c. The carbonyl group is trigonal planar. d. The oxygen atom is highly polarized and bears a substantial negative charge while the carbonyl carbon bears a substantial positive charge 8. The common name of the ether below is CH,CH,CH CH,OCH CH a. dipropyl ether b. butyl ethyl ether c. diethyl ether d. ethyl propyl ether he Williamson ether synthesis consists of anreaction of awith an alkyl halide, alkyl sulfonate, or alkyl sulfate. a. SNI, sodium chloride SN2, sodium alkoxide c. El, sodium chloride d. E2, sodium chlorideExplanation / Answer
6. When alcohols are treated with sulfuric acids, they get dehydrated to form alkenes. The ease of dehydration follows the order :
tertiary> secondary > primary.
This is because the rate determining step in the dehydration od alcohols is dissociation of protonated alcohols to form carbocation and the transition state leading to formation of a tertiary cation is the most stable ( least Eact) and thus formed most readily. Correct answer in this case is option II
7. Option a
8. Ethers are generally known by their common names which are assigned by adding the word "ether"after names of alkyl or aryl groups present in the molecule. Thus, given ether is butyl ethyl ether (option b)
9.Williamson synthesis are used for preparation of both symmetrical and unsymmetrical ethers. It is carried out by treating an alkyl or aryl substituted alkyl halide with sodium alkoxide or odium phenoxide.Mechanism followed is either SN1 ( for secondary and tertiary alcohols) and SN2 ( for primary alcohols) . Therefore, option b is correct
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