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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 84851. |
Aldehydes resemble ketones in many respects. Give a reaction in which aldehydes resemble ketones. |
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Answer» `(##ANE_PKE_CHE_XII_C12_E02_045_S01##)` |
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| 84852. |
Adipic acid is formed by oxidation of |
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Answer» cyclohexane |
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| 84853. |
Aldehydes react with one equivalent of monohydric alcohol in the presence of dry hydrogen chloride to yield alkoxyalcohol intermediate , known as hemiacetals, which further react with one more molecule of alcohol to give a gem - dialkoxy compound known as acetal. Ketones react with ethtlene glycol under similar conditions to form cyclic products known as ethylene glycol ketals. Dry hydrogen chloride protonates the oxygen of the carbonyl compounds and therefore, increases the electrophilicity of the carbonyl carbon facilitating the nucleophilic attack of ethylene glycol. Acetals and ketals are hydrolysed with aqueous mineral acids to yield corresponding aldehydes and ketones respectively. Write the reaction showing hydrolysis of ketal to obtain ketone |
Answer» SOLUTION :
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| 84855. |
Aldehydes react with one equivalent of monohydric alcohol in the presence of dry hydrogen chloride to yield alkoxyalcohol intermediate , known as hemiacetals, which further react with one more molecule of alcohol to give a gem - dialkoxy compound known as acetal. Ketones react with ethtlene glycol under similar conditions to form cyclic products known as ethylene glycol ketals. Dry hydrogen chloride protonates the oxygen of the carbonyl compounds and therefore, increases the electrophilicity of the carbonyl carbon facilitating the nucleophilic attack of ethylene glycol. Acetals and ketals are hydrolysed with aqueous mineral acids to yield corresponding aldehydes and ketones respectively. How can we recover thealdehydes and ketones from acetal and ketal ? |
| Answer» Solution :Acetals and KETALS are hydrolysed with AQUEOUS mineral acids to yield CORRESPONDING aldehydes and KETONES. | |
| 84856. |
a=difference in the oxidation number of Cl in the product X and product Y, respectively b= total number of atom in X and Y c=total number of lone pair in X then calculate a+b+c = ? |
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Answer» |
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| 84857. |
Aldehydes react with one equivalent of monohydric alcohol in the presence of dry hydrogen chloride to yield alkoxyalcohol intermediate , known as hemiacetals, which further react with one more molecule of alcohol to give a gem - dialkoxy compound known as acetal. Ketones react with ethtlene glycol under similar conditions to form cyclic products known as ethylene glycol ketals. Dry hydrogen chloride protonates the oxygen of the carbonyl compounds and therefore, increases the electrophilicity of the carbonyl carbon facilitating the nucleophilic attack of ethylene glycol. Acetals and ketals are hydrolysed with aqueous mineral acids to yield corresponding aldehydes and ketones respectively. Give the structure of ethylene glycol ketal |
Answer» SOLUTION :
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| 84858. |
Adipic acid is : |
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Answer» DIBASIC acid |
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| 84859. |
Aldehydes react with one equivalent of monohydric alcohol in the presence of dry hydrogen chloride to yield alkoxyalcohol intermediate , known as hemiacetals, which further react with one more molecule of alcohol to give a gem - dialkoxy compound known as acetal. Ketones react with ethtlene glycol under similar conditions to form cyclic products known as ethylene glycol ketals. Dry hydrogen chloride protonates the oxygen of the carbonyl compounds and therefore, increases the electrophilicity of the carbonyl carbon facilitating the nucleophilic attack of ethylene glycol. Acetals and ketals are hydrolysed with aqueous mineral acids to yield corresponding aldehydes and ketones respectively. Give the reactions of fomation of alkoxyalcohol. |
Answer» SOLUTION :
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| 84860. |
Adiabatic demagnetisation is atechnique used for |
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Answer» ADIABATIC EXPANSION of a gas |
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| 84861. |
Aldehydes react with one equivalent of monohydric alcohol in the presence of dry hydrogen chloride to yield alkoxyalcohol intermediate , known as hemiacetals, which further react with one more molecule of alcohol to give a gem - dialkoxy compound known as acetal. Ketones react with ethtlene glycol under similar conditions to form cyclic products known as ethylene glycol ketals. Dry hydrogen chloride protonates the oxygen of the carbonyl compounds and therefore, increases the electrophilicity of the carbonyl carbon facilitating the nucleophilic attack of ethylene glycol. Acetals and ketals are hydrolysed with aqueous mineral acids to yield corresponding aldehydes and ketones respectively. Whaat is teh role of dry HCl in the formation of hemiacetal by aldehydes using a primay alcohol ? |
| Answer» Solution :DRY hydrogen chloride protonated the oxygen of the carbonyl compound nad therefore INCREASES the electrophilicity of the carbonyl carbon facilitating the NUCLEOPHILIC ATTACK of ethylene glycol. | |
| 84862. |
Adiabatic reversible expansion of a gas is represented by |
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Answer» `(T_1/T_2)^GAMMA = (P_2/P_1)^((gamma - 1))` |
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| 84863. |
Aldehydes react with alcohols in presence of dry hydrogen chloride to form_______. |
| Answer» SOLUTION :ACETALS. | |
| 84864. |
Aderaline is an ..........hormone while testosterone is a ..............hormone. |
| Answer» SOLUTION :AMINE, STEROID | |
| 84865. |
Aldehydes or ketones having atleast one alpha - hydrogen undergo condensation reaction inpresence of dilute base. This reaction is called |
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Answer» Aldol condensation |
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| 84866. |
Write the energy distribution curve showing temperature dependence of rate of a reaction. |
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Answer» Solution : Consider a reaction ` R to p` -`d[r]/(-d[R])`/dt=`K[R]^circ [R]^circ `=1 `(-d[R])/dt = Kxx1 `/ `d[R] =kdt` On Integration `-int d[R] = kintdt` `-[R]=KT+C ` ` t=0[R]=[R]_circ` `-[R]_circ = K(0)+c` C=`-[R]circ` SUBSTITUTE value of .C. in (1) `-[R] = Kt -[R]_circ` K= `([R]_circ - [R])/t` 
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| 84867. |
Aldehydes other than formaldehyde react with Grignard reagent to give addition products which on hydrolysis give |
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Answer» tertiary alcohols |
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| 84868. |
(a)Mention the integrated rate equation for a zero order reaction (b)Give any two differences between order and molecularity of reaction |
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Answer» Solution :Consider a zero ORDER reaction `R to P` Rate `=K[R]^(0)` Rate=`K[R]^(0)` Rate = `K xx 1` where K - rate constant or velocity const Rate =- `d[R]//DT` `-d[R]//dt= k implies d[R]=-Kdt` `int d[R] =-Kint dt` `[R] = K+1` I-integration constant To find I, when t=0, [R] = [R_(0)]` `[R_(0)]=-K xx 0+1` `I=[R_(0)]` Substituting in EQ. (1) `[R]=Kt+[R_(0)]` `K=[R_(0)]-([R])/(t)` (b) 
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| 84869. |
Aldehydes, Ketones are the compounds having >C=O group. Choose the IUPAC name of the compound CH_3CH=CH=CHO |
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Answer» Propen-1-al |
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| 84870. |
Aldehydes may be distinguished from ketones by the use of |
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Answer» cone. `H_(2)SO_(4)` |
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| 84871. |
Adenosine monophosphane (AMP) is a |
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Answer» nucleotide |
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| 84872. |
Aldehydes, Ketones and Carboxylic acids are Carbonyl compounds. Aldehydes differ from Ketones in their oxidation reaction. Illustrate with one example. |
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Answer» `CH_3_CHOoverset([o])rarrCH_3-COOH` But ketones do not undergo oxidation with mild oxidising agents. They undergo oxidation only when heated with strong oxidising agents such as con. `HNO_3` to from a mixture of acids containing less number of carbon atoms. `(##ANE_PKE_CHE_XII_C12_E02_059_S01##)` |
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| 84873. |
Aldehydes, Ketones and Acids contain >>C=O group. Name the product obtained by the reaction between Acetic acid and Ethanol. |
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Answer» |
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| 84874. |
Adenosine is an example of a |
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Answer» NUCLEOTIDE |
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| 84875. |
Aldehydes, Ketones and acids contain >C=O group. Choose the IUPAC name of the compound (CH_3)_2CHCOOH |
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Answer» BUTANOIC acid |
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| 84876. |
Aldehydes are more reactive than Ketones. Explain. |
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Answer» |
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| 84877. |
Aldehydes having no alpha-hydrogen atom undergo : |
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Answer» FRIEDEL - CRAFT's reaction |
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| 84878. |
Aldehydes have higher boiling points than alkanes of similar molecular weight, give suitable reasons. |
Answer» Solution :The carbonyl group in aldehyde is polar in NATURE.  As a result, the molecules of ALDEHYDES are held together by strong dipole-dipole attractions. Hence, large amount of energy is REQUIRED to overcome these attractive interaction. Such kind of ATTRACTION is not PRESENT in alkanes. Therefore aldehydes have higher boiling points than the corresponding alkanes. |
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| 84879. |
Adenosine is an example of : |
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Answer» Nucleotide |
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| 84880. |
Aldehydes having no alpha - hydrogen atom undergo |
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Answer» HOFFMAN reaction |
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| 84881. |
Adenosine 3',5' - cyclicmonophosphatea chemicalmessengeris otherwise called ………….. . |
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Answer» <P>ATP |
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| 84882. |
Aldehydes give positive test for Fehling's solution while ketones give negative test. Explain. |
| Answer» Solution :ALDEHYDES can be oxidised to their CORRESPONDING carboxylic acids by Fehling's solution but KETONES cannot be oxidised HENCE ketones give NEGATIVE test for Fehling's solution. | |
| 84883. |
Adenosine is an example of |
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Answer» PYRIMIDINE BASE |
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| 84884. |
Adenine is one of the two purine bases involved in the formation of nucleotides of the nucleic acids. The molecular formula of adenine is C_(x)H_(x)N_(x) the value of 'x' is |
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Answer» |
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| 84885. |
Aldehydes do not form stable hydrates, yet chloral hydrate is readily formed , why ? |
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Answer» Solution :In chloral , three STRONG ELECTRON withdrawing chlorine atoms are present. Asa result , WEAK NUCLEOPHILE like water can easily add. Besides this, intra molecular hydrogen BONDING between chlorine and hydrogen atom of - OH group further stabilises the molecule. `CH_3CH_2CH_2CH_2CHO+ ` `H -underset(CHO)underset(|)(CH)-CH_2-CH_2-CH_3rarr` `CH_3-CH_2-CH_2-CH_2-underset(OH)underset(|)(CH)-underset(CHO)underset(|)(CH)-CH_2-CH_2-CH_3` |
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| 84886. |
Aldehydes can be reduced to hydrocarbons by: |
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Answer» CLEMMENSEN REDUCTION |
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| 84887. |
Adenine pairs with thymine through |
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Answer» TWO HYDROGEN BONDS |
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| 84888. |
Addition of CdCl_(2) to AgCl yields solid solution where the divalent cations Cd^(2+) occupy the Ag^(+) sites. Which one of the following statements is true ? |
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Answer» The NUMBER of CATIONIC VACANCIES is equal in number of that of divalent ions ADDED |
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| 84889. |
Aldehydes can be oxidised by: |
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Answer» Tollen.s reagent |
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| 84890. |
Aldehydes can be distinguished from ketones by using |
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Answer» dil . NAOH |
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| 84891. |
Additon of HCl to t-butene in presence of R_(2)O_(2) fomrs |
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Answer» 2-chlorobutane `CH_(3)CH CH=CH_(2)+HCl overset(R_(2)O_(2)) toCH_(3) CH_(2)CH ClCH_(3)` |
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| 84892. |
Additional ICl on propene gives the product: |
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Answer» `CH_3CHClCH_3` |
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| 84893. |
Addition reaction of alkene with hydrogen halide is known as ……….. |
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Answer» HALOGENATION |
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| 84894. |
Aldehydes can be conveniently separated from alcohols by treating with : |
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Answer» `Na_2SO_4` |
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| 84895. |
Addition polymer. |
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Answer» Solution :The polymer formed by the REPEATED ADDITION of a large NUMBER of MONOMERS like ALKENES are called addition polymers. Examples : 
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| 84896. |
Addition of zinc powder to CuSO-4solution precipitates copper due to : |
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Answer» REDUCTION of `CU^(2+)` |
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| 84897. |
Aldehydes are produced in atmosphere by: |
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Answer» OXIDATION of SECONDARY alcohols |
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| 84898. |
When iron or zinc added to CuSO_(4) solution copper is precipitated, it due to |
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Answer» Hydrolysis of ` CuSO_4` |
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| 84899. |
Aldehydes behave as: |
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Answer» OXIDISING agent |
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| 84900. |
Addition of which chemical will decrease the hydrogen ion concentration of an acetic acid solution |
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Answer» `NH_(4)Cl` |
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