Recent questions tagged ch-12

Name the following compounds according to IUPAC system of nomenclature $(i)CH_3CH(CH_3)CH_2CH_2CHO \\ (ii)CH_3CH_2COCH(C_2H_5)CH_2CH_2Cl \\ (iii) CH_3CH = CHCHO \\ (iv) CH_3COCH_2COCH_3 \\ (v) CH_3CH(CH_3)CH_2C(CH_3)_2COCH_3 \\ (vi) (CH_3)_3CCH_2 COOH \\ (vii) OHCC_6H_4CHO-P$

asked Dec 29, 2016 by meena.p

1 answer

Arrange the following compounds in the increasing order of their boilling points : $CH_3CH_2CH_2CHO,CH_3CH_2CH_2CH_2OH,H_5C_2-O-C_2H_5,CH_3CH_2CH_2CH_2CH_3$

asked Dec 29, 2016 by meena.p

1 answer

How do you account for the following ? Hydrazones of aldehydes and ketones are not prepared in a highly acidic medium

asked Dec 29, 2016 by meena.p

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How will you test aldehydes and ketones with (i) Tollens' reagent (ii) Fehiling's solution . Give equation

asked Dec 29, 2016 by meena.p

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An ether A $(C_5H_{12}O)$ when heated with excess of hot concentrated $HI$ produced two alkyl halides which on hydrolysis from compounds B and C. Oxidation of B gives an acid D whereas oxidation of C gave a ketone E. Deduce the structures of A, B, C, D and E.

asked Dec 29, 2016 by meena.p

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Explain the reason behind a colour of some gem stone with the help of example.

asked Dec 28, 2016 by meena.p

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Draw the structure of : (i) 3- methyl butanal (ii) 4- chloropentan-2-one (iii) 3-oxopentanal

asked Nov 25, 2016 by meena.p

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Give names of the reagents to bring about the following transformations: (i) Hexan-1-ol to hexanal (ii) Cyclohexanol to cyclohexanone (iii) P-Fluorotoluene to p-Fluorobenzaldehyde (iv) Ethanenitrile to ethanal (v) Allyl alcohol to propenal

asked Nov 25, 2016 by meena.p

1 answer

An organic compound $(A)\; \{C_8H_{16}O_2\}$ was hydrolysed with dilute sulphuric acid to give a carboxylic acid $(B)$ and an alcohol $(C)$. Oxidation of $(C)$ with chromic acid produced $(B)$.$(C)$ on dehydration gives but‐1‐ene .Identity $A,B,C$

asked Nov 22, 2016 by meena.p

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(i) Why pH of reaction should be carefully controlled while preparing ammonia derivatives of carbonyl compound? (ii) Why formic acid is stronger acid than acetic acid

asked Nov 22, 2016 by meena.p

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a)Give reasons for the following : (i) Glucose does not give 2,4-DNP test and Schiff’s test (ii) Amino acids have high melting points and are soluble in water. (b) What is meant by the secondary structure of proteins?

asked Nov 16, 2016 by meena.p

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Account for the following : Sodium bisulphites is used for the purification of aldehydes and ketones .

asked Nov 11, 2016 by meena.p

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a)Give chemical tests to distinguish between compounds in each of the following pairs: i) Benzaldehyde and Acetone ii)Phenol and Ethanol b)Give reasons for the following: i)Although –$NH_2$ group is an ortho and para directing group, nitration of aniline gives along with ortho and para as well as meta derivative also, why? ii)Conc.HI is preferable used in the cleavage of ether linkage. Explain. iii)Out of $PCl_5$ and $SOCl_2$ which one is a better reagent for the conversion of alcohol to alkyl chloride and why?

asked Nov 10, 2016 by meena.p

1 answer

(a) Bring out the following conversions:. (i) 4-nitrotoluene to 2-bromobenzoic acid. (ii) Ethylcyanide to 1- phenyl propanone. (b) Give a reason for the following : (i) Chloroacetic acid is more acidic than acetic acid. (ii) Carboxylic acids have higher boiling point than alcohols. (iii) 4-nitrobenzoic acid is more acidic than 4-methoxy benzoic acid.

asked Nov 10, 2016 by meena.p

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How would you account for the following : (i) The following order of increase in strength of acids $PH_3 < H_2S < HCl $ (ii) The oxidizing power of oxo-acids of chlorine follows the order . $HClO_4 < HClO_3 < HClO_2 < HClO$

asked Nov 9, 2016 by meena.p

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Write the structure of 4 - methyl pent -3-en -2- one

asked Nov 4, 2016 by meena.p

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a)Draw the structure of A- methylpent -3-en-2-one b) Write the structure of 4 - methyl pent -3-en -2- one

asked Nov 1, 2016 by meena.p

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State the uses of carboxylic acids :

asked Oct 31, 2016 by meena.p

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Write chemical equation for the following conversions : (i) Nitro benzene to benzoic acid. (ii) Benzyl chloride to 2-phenylethanamine. (iii) Aniline to benzyl alcohol .

asked Oct 26, 2016 by meena.p

1 answer

(i) Give names of the reagents to bring about the following transformations. (a) Ethanoic acid to ethanol(b) Propan -1-ol to propanal(c) Pent -3 -en-2-ol to Pent -3-en-2-one(d) Sodium benzonte to benzene(ii) Arrange the following in the increasing order (a) Methanal, propanal, butanone, ethanal , propanone (nucleophilic addition reaction ) (b) Formaldehyde , acetone , acetaldehyde (reactivity towards HCN)(c) Acetophenone , P- toludehyde, p-nitrobenzaldehyde, benzaldehyde (nucleophilic addition reaction )

asked Oct 18, 2016 by meena.p

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Predict the product of the following reaction :

asked Oct 17, 2016 by meena.p

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Which of these compounds is synthesized by chloral ?

asked Dec 10, 2015 by meena.p

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Among the following the strongest acid is

asked Dec 10, 2015 by meena.p

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$CH_3COCH_3$ can be converted to $CH_3CH_2CH_3$ by the action of

asked Dec 10, 2015 by meena.p

2 answers

A compound most suitable for the preparation of cyandydrin is

asked Dec 10, 2015 by meena.p

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The intermediate formed in aldol condensation is

asked Dec 10, 2015 by meena.p

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Strongest acid among the following is :

asked Dec 10, 2015 by meena.p

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Vinegar is

asked Dec 10, 2015 by meena.p

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Benzaldehyde can be prepared by the hydrolysis of

asked Dec 10, 2015 by meena.p

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Which of the following compound will not give cannizzaro's reaction?

asked Dec 10, 2015 by meena.p

1 answer

Which of the following is called an ethanoic acid ?

asked Dec 10, 2015 by meena.p

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Which one is the strongest of the following acide ?

asked Dec 10, 2015 by meena.p

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Which of the following will not under go alcohol condensation ?

asked Dec 10, 2015 by meena.p

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Which of the following compound gives cannizzaro's reaction ?

asked Dec 10, 2015 by meena.p

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In wolf-kishner reduction, the carbonyl group of aldehydes and ketones is conusted into

asked Dec 10, 2015 by meena.p

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When ethanal is treated with Fehling's solution it gives a precipitate of

asked Dec 10, 2015 by meena.p

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The general formula $C_nH_{2n}O_2$ could be for open chain

asked Dec 10, 2015 by meena.p

1 answer

Consider the acidity of the carboxylic acids

asked Dec 10, 2015 by meena.p

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Acid catalysed hydration of allcenes except ethene leads to the formation of

asked Dec 10, 2015 by meena.p

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The increasing order of the rate of HCN addition to compounds A-n is $(A)HCHU \qquad (B) CH_2COCH_3 \qquad (C) PhCOcH_3 \qquad (D) PhCOPb$

asked Dec 10, 2015 by meena.p

1 answer

The compound formed as a result of oxidation of ethyl benzene by $KMnO_4$ is

asked Dec 10, 2015 by meena.p

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Silver mirror test is given by which one of the following compounds ?

asked Dec 10, 2015 by meena.p

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The strongest acid amongest the following compounds is

asked Dec 10, 2015 by meena.p

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Self condensation of two moles of ethyl acetate in presence of sodium ethoxide yields

asked Dec 10, 2015 by meena.p

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In a set of reaction propipnic acid yielded a compound D $CH_3CH_2COOH \underrightarrow{SOCl_2} \quad B \quad \underrightarrow{NH_3} \quad C \quad \underrightarrow{KOH} D$ The structure of D would be :

asked Dec 10, 2015 by meena.p

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Reduction by $LiAlH_4$ of hydrolyzed product of an ester gives

asked Dec 10, 2015 by meena.p

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Ethyl benzoate can be prepared from benzoic acid by using

asked Dec 10, 2015 by meena.p

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Which one of the following compounds will react with $NaHCO_3$ solution to give sodium salt and carbon dioxide ?

asked Dec 10, 2015 by meena.p

1 answer

Which one of the following esters cannot undergo claisen self- condensation ?

asked Dec 10, 2015 by meena.p

1 answer

An acyl halide is formed when $Pcl_5$ reacts with an

asked Dec 10, 2015 by meena.p

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