Recent questions tagged alcohols-phenols-and-ethers

An alcohol A $(C_4H_{10}O)$ on oxidation with acidified potassium dichromate gives carboxylic acid B $(C_4H_8O_2)$. Compound A when dehydrated with conc. $H_2SO_4$ at $443 \;K$ gives compound C. Treatment of C with aqueous $H_2SO_4$ gives compound D $(C_4H_{10}O)$ which is an isomer of A. Compound D is resistant to oxidation but compound A can be easily oxidised. Identify A, B, C and D and write their structures

asked Dec 29, 2016 by meena.p

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An organic compound A having molecular formula $C_6H_6O$ gives a characteristic colour with aqueous $FeCl_3$ . When A is treated with $NaOH$ and $CO_2$ at $400\;K$ under pressure, compound B is obtained. Compound B on acidification gives compound C which reacts with acetyl chloride to form D which is a popular pain killer. Deduce the structure of A, B, C and D. What is the common name of Drug D?

asked Dec 29, 2016 by meena.p

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(a)Which of the following is an appropriate set of reactants for the preparation of 1-methoxy-4-nitrobenzene and why?

asked Nov 29, 2016 by meena.p

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Explain the following observations: (i) The boiling point of ethanol is higher than that of methoxy methane. (ii) Phenol is more acidic than ethanol (iii) O-and -P - nitrophenols are more acidic than phenol . (iv) Phenol is an acid but does not react with sodium bicarbonate solution .

asked Nov 29, 2016 by meena.p

1 answer

Ethyl alcohol to which another liquid has been added to make it unfit for use as beverage is called denatured alcohol. Ethyl alcohol denatured by adding methyl alcohol, is highly poisonous. Answer the following questions: (i) Mention another way by which alcohol is denatured. (ii) Explain why methanol is highly toxic to human beings? (iii) How is methanol prepared on large-scale? Give its two important uses.

asked Nov 28, 2016 by meena.p

1 answer

An aromatic compound 'A' on treatment with $CHCl_3/KOH$ gives two compounds 'B' and 'C'. Both B and C give the same product 'D' when distilled with zinc dust. oxidation of D gives E having molecular formula $C_7H_6O_2$. The sodium salt of E on heating with sodalime gives F which may also be obtained by distilling A with Zinc dust . Identify A to F

asked Nov 23, 2016 by meena.p

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Write two important uses of formalin .

asked Nov 14, 2016 by meena.p

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(a) Give the equation of reaction for the preparation of phenol from cumene. (b) Write the chemical reaction for the preparation of phenol from chloro benzene

asked Nov 11, 2016 by meena.p

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(a) Write a suitable chemical equation to complete each of the following transformations: (i) Butan-1-ol to butanoic acid . ( ii) 4 -Methylacetophenone to benzene -1,4-dicarboxylic acid (b) Suggest a reagent for conservation of ethanol to ethanoic acid

asked Nov 9, 2016 by meena.p

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Name the alkyl halide and sodium alkaloid used to synthesize tert - butyl ether

asked Nov 8, 2016 by meena.p

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Show how will you synthesize : (i) 1- phenylethanol from a suitable alkene (ii) cyclohexyl methanol using an alkyl halide by an $SN^2$ reaction . (iii) Pentan-1-ol using a suitable alkyl halide ?

asked Nov 7, 2016 by meena.p

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How do you account for the miscibility of ethoxyethane with water.

asked Nov 4, 2016 by meena.p

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(a) Illustrate the following reactions giving a suitable example for each : (i) Cross aldol condensation (ii) Decarboxylation (b) Give Simple tests to distinguish between the following pairs of compounds : (i) Pentan -2-one and pentan -3-one (ii) Benzaldehyde and Acetophenone (iii) Phenol and Benzoic acid .

asked Nov 2, 2016 by meena.p

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Lower alcohol are soluable in water higher alcohols are not why ?

asked Nov 1, 2016 by meena.p

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Explain why phenols do not undergo substitution of the -OH group like alcohols ?

asked Oct 31, 2016 by meena.p

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Although chlorine is an electron with drawing group , yet it is ortho- , Para - directing in electrophilic aromatic substitution reaction . Explain why it is so ?

asked Oct 26, 2016 by meena.p

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Suggest a reagent for conservation of ethanol to ethanoic acid

asked Oct 25, 2016 by meena.p

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(a) Give names of the reagents to bring about the following transformations : (i) Ethanoic acid to ethanol (ii) Propan -1-ol to propanal (iii) Pent -3-en-2-ol pent-3-en-2-one (iv) Sodium benzoate to benzene (b) Arrange in the following in increasing order of : (i) Methanal , Propanal, Butanone, ethanal,Propanone(Nucleophilic addition reaction ) (ii) Formaldehyde , Acetone , Acetaldehyde (reactivity towards HCN) (iii) Acetophenone, p- tolualdehyde, p-nitrobenzaldehyde, Benzaldehyde(nucleophilic addition reaction ).

asked Oct 24, 2016 by meena.p

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How will you prepare benzyl alcohol from benzaldehyde with out using a reducing agent ?

asked Oct 21, 2016 by meena.p

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Arrange the following in order of decreasing acid strength $CH_3OH, H_2O ,C_6H_5OH$

asked Oct 21, 2016 by meena.p

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Alcohols act as weak bases . explain

asked Oct 14, 2016 by meena.p

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a)Give the mechanism of preparation of ethoxy ethane from ethanol b) Alcohols act as weak bases . explain .

asked Oct 13, 2016 by meena.p

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In the following sequence of reaction $CH_3CH_2OH \quad \underrightarrow {P+I_2} \quad A \quad \underrightarrow {Mg} \quad B \quad \underrightarrow {HCHO} \quad C \quad \underrightarrow {H_2O} D$ the compound D is :

asked Dec 8, 2015 by meena.p

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In the reaction sequence : $CaC_2 \quad \underrightarrow {H_2O} \quad A \quad \underrightarrow {dil.H_2SO_4} \quad B \quad \underrightarrow {H_2/Ni}\quad C$, the term C is

asked Dec 8, 2015 by meena.p

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In the following sequence of reactions $CH_3-Br \quad$$ \underrightarrow {KCN} A\quad \underrightarrow{H_3 O} \quad B \underrightarrow{LiAlH_4} \quad C$

asked Dec 8, 2015 by meena.p

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But-1-ene $\to$ ? the product in the above reaction is ?

asked Dec 8, 2015 by meena.p

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End product of the following reaction is $CH_3CH_2COOH \to alcoholic KOH$

asked Dec 8, 2015 by meena.p

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Alkyl Fluorides are synthesised by heating an alkyl chloride / bromide in presence of - or -

asked Dec 8, 2015 by meena.p

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Alkyl halides are prepared from alcohols by treating with

asked Dec 8, 2015 by meena.p

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Which of the following are secondary bromides ?

asked Dec 7, 2015 by meena.p

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Which of the following compounds are g.m dihalide ?

asked Dec 7, 2015 by meena.p

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Reaction of $C_6H_5CH_2Br$ with aqueous sodium hydroxide follows _____________

asked Dec 7, 2015 by meena.p

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The position of Br in the compound in $CH_3CH = CHC(Br)(CH_3)_2$ can be classofied

asked Dec 7, 2015 by meena.p

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Which of the following are benzylic alcohols ?

asked Dec 7, 2015 by meena.p

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Phenol can be distinguished from ethnal by the reaction with ___________

asked Dec 7, 2015 by meena.p

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Which of the following reagents can be used to oxidised primary alcohol to aldehydes ?

asked Dec 7, 2015 by meena.p

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Which of the following are used to convert $RCHO$ into $RCH_2OH$?

asked Dec 7, 2015 by meena.p

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Which of the following is most acidic ?

asked Dec 7, 2015 by meena.p

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Phenol is less acidic than ____________

asked Dec 7, 2015 by meena.p

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Which of the following compounds will reacts with sodium hydroxide solution in water ?

asked Dec 7, 2015 by meena.p

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IUPAC name of m- cresol is _______________

asked Dec 7, 2015 by meena.p

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The process of converting alkyl halider into alcohols involves ___________

asked Dec 7, 2015 by meena.p

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$CH_3CH_2OH$ can be converted into $CH_3CHO$ by _____________

asked Dec 7, 2015 by meena.p

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What is the correct order of re activity of alcohols in the following reaction ? $R-OH+HCL \to Zncl_2 R-Cl+H_2O$

asked Dec 7, 2015 by meena.p

1 answer

Mono chlorination of toulene in sunlight followed by hydrolysis with aq. $NaOH$ yields

asked Dec 7, 2015 by meena.p

0 answers

How many alcohols with molecules formula $C_4H_{10}$ are chiral in nature ?

asked Nov 30, 2015 by meena.p

1 answer

Phenol can be distinguished from ethanol by the following reagents except

asked Nov 30, 2015 by meena.p

1 answer

The best method to prepare cyclohexene from cyclohexanol is by using

asked Nov 30, 2015 by meena.p

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Amongest the following $HBr$ reacts fastest with

asked Nov 30, 2015 by meena.p

1 answer

Benzendiazonium chloride on reaction with phenol is weakly basic medium gives:

asked Nov 30, 2015 by meena.p

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