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InterviewSolution
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.
| 101. |
The IUPAC name of crotonaldehyde isA. pentenalB. but - 2- en - 1 - alC. but -2 - an - 1 - alD. but - 2 - en - 1 - ol |
| Answer» Correct Answer - B | |
| 102. |
The IUPAC name of crotonaldehyde isA. butenadlehydeB. butanal-1C. but-2-en-1-alD. prop-2-en-1-ol |
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Answer» Correct Answer - C The structural formula of crotonaldehyde is `underset("But-2-en-1-al") overset( 4)(CH_(3))-overset(3)(CH)=overset(2)CHoverset(1)CHO` |
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| 103. |
Statement-1: Acetic acid does not undergo haloform test. and Statement-2: Acetic acid does not contain any `alpha`- hydrogen.A. Statement-1 is True, Statement-2 is true, statement-2 is a correct explanation for statement-6B. Statement -1 is true, Statement-2 is true, statement-2 is not a correct explanation for statement-6C. Statement-1 is true, statement -2 is FalseD. Statement-1 is False, Statement-2 is true |
| Answer» Correct Answer - C | |
| 104. |
Say TRUE or FALSE:Aldol condensation is given by all aldehydes and ketones. |
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Answer» False Aldol condensation is given by all aldehydes and ketones |
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| 105. |
What is the term used for elimination of water molecule ? |
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Answer» Dehydration is the term used for elimination of water molecule. |
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| 106. |
The major product of the addition of water molecule to propyne in the presence of mercuric sulphate and dil sulphuric acid is ....... |
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Answer» The major product of the addition of water molecule to propyne in the presence of mercuric sulphate and dil sulphuric acid is Propanone |
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| 107. |
Benzaldehyde undergoes Cannizzaro’s reaction to give :(a) sodium benzoate and methyl alcohol (b) sodium benzoate and benzyl alcohol (c) benzyllic acid and benzyl alcohol (d) phenol and benzoic acid |
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Answer» Option : (b) sodium benzoate and benzyl alcohol |
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| 108. |
Aldehydes and Ketones have lower boiling points than corresponding alcohols. Why? |
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Answer» The boiling points of aldehydes and ketones are lower than that of corresponding alcohols and acids due to absence of intermolecular H–bonding in aldehydes and ketones. |
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| 109. |
How would you account for the following :The boiling points of aldehydes and ketones are lower than of the corresponding acids. |
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Answer» The boiling points of aldehydes and ketones are lower than that of corresponding alcohols and acids due to absence of intermolecular H–bonding in aldehydes and ketones. |
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| 110. |
The reaction in which two molecules combine to form a new molecule with the elimination of a small molecule like water is called :(a) an oxidation reaction (b) a condensation reaction (c) a hydrolysis reaction (d) a redox reaction |
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Answer» Option : (b) an oxidation reaction |
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| 111. |
Aldol reaction is :(a) an addition reaction (b) an elimination reaction (c) a self-reduction reaction (d) a disproportionate ion reaction |
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Answer» Option : (a) an addition reaction |
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| 112. |
The hydrolysis product of alkyl cyanide is : (a) primary amine (b) amides (c) aldehyde (d) carboxylic acid |
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Answer» Option : (d) carboxylic acid |
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| 113. |
The formation of acetone cyanohydrin from acetone is an example of :(a) Nucleophilic addition (b) Nucleophilic substitution (c) Electrophilic addition (d) Electrophilic substitution |
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Answer» Option : (a) Nucleophilic addition |
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| 114. |
Both aldehydes and ketones can react with :(a) Tollen’s reagent (b) the Grignard reagent(c) Fehling’s solution (d) Schiff's reagent |
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Answer» Option : (b) the Grignard reagent |
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| 115. |
How is Schiff's reagent prepared?(a) By passing CO2 through p-rosaniline solution (b) By passing NO2 through p-rosaniline solution (c) By passing SO2 through p-rosaniline solution (d) By passing NH3 through silver nitrate solution |
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Answer» Option : (c) By passing SO2 through p-rosaniline solution |
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| 116. |
Which of the following compounds do not produce pink colour with Schiff's reagent? (a) Formaldehyde(b) 2-propanone (c) 3-pentanone (d) Both (b) and (c) |
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Answer» Option : (d) Both (b) and (c) |
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| 117. |
Acetone can be reduced to propane, the reduction is called :(a) Clemmensen's reduction (b) catalytic reduction (c) Rosenmund’s reduction (d) partial reduction |
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Answer» Option : (a) Clemmensen's reduction |
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| 118. |
Which of the following reagents can react with acetaldehyde to give water soluble white crystal-line solid?(a) NaHSO4(b) NaHSO3 (c) Na2SO3(d) Na2SO4 |
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Answer» Option : (b) NaHSO3 |
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| 119. |
Which colour is obtained when Schiff's reagent is treated with acetaldehyde? |
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Answer» When Schiff's reagent is treated with acetaldehyde, pink colour is obtained. |
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| 120. |
When acetaldehyde Is treated with dilute NaOH, the following reaction is observed.(1) What are the functional groups in the product? (2) Can another product be formed during the same reaction? (Deduce the answer by doing atomic audit of reactant and product)(3) Is this an addition reaction or condensation reaction? |
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Answer» (1) There arc two functiona’ groups in the product: -CRO and -OH (2) No other product can be formed in the same reaction. (3) This is an addition reaction. |
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| 121. |
Acetaldehyde, when treated with which among the following reagents does 'not' undergo addition reaction? (a) ammonia (b) hydroxyl amine (c) ammoniacal silver nitrate (d) semicarbazide |
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Answer» Option : (c) ammoniacal silver nitrate |
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| 122. |
Identify the strongest acid amongst the following : (a) Chloroacetic acid (b) Acetic acid (c) Trichloroacetic acid (d) Dichloroacetic acid |
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Answer» Option : (c) Trichloroacetic acid |
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| 123. |
The compound having general formula is called (a) diester (b) acid anhydride (c) hemiacetal(d) acetal |
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Answer» Option : (d) acetal |
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| 124. |
Why does skin have burning sensation, when an ant bites? |
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Answer» When an ant bites, formic acid is released from an ant which gives burning sensation as the acid comes in contact with the skin. |
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| 125. |
`C_(6)H_(5)-CH=CHCHO overset((X))rarr C_(6)H_(5)CH=CH_(2)OH` In the above sequence (X) can be:A. `H_(2)//Ni`B. `NaBH_(4)`C. `K_(2)Cr_(2)O_(7)//H^(+)`D. Both (a) and (b) |
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Answer» Correct Answer - B `underset("Cinnamic aldehyde")(C_(6)H_(5)-CH=CHCHO)overset(NaBH_(4)) to underset("Cinnamic alcohol")(C_(6)H_(5)=CH*CH_(2)OH)` |
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| 126. |
Arrange the following carboxylic acids with increasing order of their acidic strength and justify your answer. |
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Answer» The increasing order of acidity will be 1 < 3 < 2. Acidity depends on mainly two factors : (1) ease of proton release (2) stability of conjugate base formed. In example (3) the ether O exerts a I effect and is closer to COOH group than in 2 (1 effect diminishes). Also the conjugate base formed will be stabilized by the same – I effect by delocalization of charge. |
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| 127. |
The most suitable reagent for the conversoin of primary alcohol into aldehyde with the same number of carbon isA. acidified `K_(2)Cr_(2)O_(7)`B. acidified `KMnO_(4)`C. alkaline `KMnO_(4)`D. pyridinium chlorochromate |
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Answer» Correct Answer - D The most suitable reagent in pyridinium chlorochromate (PCC) `RCH_(2)OH overset(PC C) to RCHO` |
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| 128. |
Which of the following givens an aldehyde on dry distillation ?A. Calcium formate + calcium acetateB. Calcium acetate +calcium benzoateC. Calcium acetateD. Calcium benzoate |
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Answer» Correct Answer - A `(HCOO)_(2)Ca+(CH_(3)COO)_(2)Ca overset("Dry distilation") to 2CH_(3)CHO+CHO+2CaCO_(3)` |
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| 129. |
which of the following on heating with aqueous KOH produces acetaldehyde?A. `CH_(3)COCl`B. `CH_(3)CH_(2)Cl`C. `CH_(2)ClCH_(2)Cl`D. `CH_(3)CHCl_(2)` |
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Answer» Correct Answer - D `CH_(3)-overset(O)overset(||)C-Cl overset(KOH(aq))toCH_(3) -overset(O)overset(||)C-OH` `CH_(3)CH_(2)Cl overset(KOH(aq)) to CH_(3)CH_(2)OH` `ClCH_(2) -CH_(2) Cl overset(KOH(aq)) to HOCH_(2)-CH_(2)OH` `CH_(3)CHCl_(2) overset(KOH(aq)) tounderset("Intermediate")(CH_(3)-CH(OH)_(2)) tounderset("Acetaldehyde")(CH_(3)-CH=O)` |
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| 130. |
Hexane dioic acid in obtained by oxidation ofA. benzeneB. cyclohexaneC. cyclohexeneD. cyclohexane carbaldehyde |
| Answer» Correct Answer - C | |
| 131. |
The carbon atom of the carboxylic group is : (a) sp3 -hybridized (b) sp2 -hybridized (c) sp-hybridized (d) unhybridized |
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Answer» Option : (b) sp2 -hybridized |
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| 132. |
Propionic acid can be prepared by the :(a) action of propyl magnesium chloride on dry ice(b) alkaline hydrolysis of propyl cyanide (c) acid hydrolysis of ethyl cyanide (d) oxidation of Propanone |
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Answer» Option : (c) acid hydrolysis of ethyl cyanide |
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| 133. |
The common name of carboxylic fatty acids is derived from :(a) the name of parent alkanes (b) the name of corresponding aldehydes (c) from their original sources (d) the name of alkyl group present in them |
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Answer» Option : (c) from their original sources |
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| 134. |
For the nomenclature of carboxylic acids, the suffix used is :(a) -ane (b) -oic (c) -al (d) -ol |
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Answer» Option : (b) -oic |
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| 135. |
A mixture of sodium benzoate and sodalime on heating yields :(a) methane(b) benzene (c) sodium benzoate (d) calcium benzoate |
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Answer» Option : (b) benzene |
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| 136. |
The reaction of C6H5CH = CHCHO with LiAlH4 gives :(a) C6H5CH2CH2CH2OH (b) C6H5CH2CH2CHO (c) C6H5CH = CHCH2OH (d) C6H5CH2CHOHCH3 |
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Answer» Option : (a) C6H5CH2CH2CH2OH |
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| 137. |
Predict the product in the following reaction :The compound A is :(a) butane (b) propane (c) ethane (d) propene |
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Answer» Option : (b) propane |
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| 138. |
Identify the reactant in the following reaction :(a) H2O(b) HCHO(c) CO(d) CH3CHO |
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Answer» Option : (c) CO |
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| 139. |
Draw a stepwise mechanism for the following reaction |
| Answer» It is an example acid catalyzed rearrangement | |
| 140. |
When ethanal reacts with `PCl_(5)`, then product formed isA. vic-chlorideB. gem-chlorideC. 2, 2 dichlorithanalD. syn-dichloroethane |
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Answer» Correct Answer - B `CH_(3)CHO overset(PCl_(5)) to underset("Gem-cloride")(CH_(3)CHCl_(2))+POCl_(3)` |
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| 141. |
Select the reagent for the following reaction: A. `SeO_(2)`B. `O_(3), Zn//H_(2)O`C. `O_(3), H_(2)O_(2) -(CH_(3)COOH)`D. PCC |
| Answer» Correct Answer - B | |
| 142. |
`CH_(3)-overset(O)overset(||)C-CH_(2)overset("Conc")underset(HNO_(3))to` Product The product isA. `CH_(3)COOH`B. `CH_(3)CH_(2)COOH+ HCOOH`C. `CH_(3)CH_(2)CH_(2)COOH`D. No reaction |
| Answer» Correct Answer - A | |
| 143. |
The product predominates isA. B. C. D. |
| Answer» Correct Answer - A | |
| 144. |
Arrange the following compounds in increasing order of their property as indicated:1. Acetaldehyde, Acetone, Di-tert-butyl ketone, Methyl tert-butyl ketone (reactivity towards HCN)2. CH3CH2CH(Br)COOH, CH3CH(Br)CH2COOH, (CH3)2CHCOOH, CH3CH2CH2COOH (acid strength)3. Benzoic acid, 4-Nitrobenzoic acid, 3,4-Dinitrobenzoic acid, 4-Methoxybenzoic acid (acid strength). |
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Answer» 1. Aldehydes and ketones undergo nucleophilic addition. In this case more the (i.e. addition of HCN) +1 effect of the R-group and more the steric hindrace, lesser is the reactivity therefore, their increasing order of reactivity is Di - tert - butyl ketone < Methyl tert butyl ketone < Acetone < Acetaldehyde. 2. In carboxylic acids +1 effect of R group decreases and -I effect of halogen increases the acidic character. Further, nearer the halogen atom to the carboxylic acid group, stronger is its -I effect. Therefore, the increasing order of acid strength is 3. In benzoic acid and its derivatives, electron withdrawing group attached to ring increases its acidic strength while electron releasing group decreases the acidic strength. The effect is more pronounced if such a group is present at p-position. Nitro group is electron withdrawing (‘R effect) while methoxy group in an electron releasing. There fore increasing order of acid strength is |
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| 145. |
Arrange the following compounds in increasing order of their reactivity in nucleophilic addition reactions. 1. Ethanal, Propanal, Propanone, Butanne. 2. Benzaldehyde, p-Tolualdehyde, p-Nitrobenzaldehyde, Acetophenone. Hint: Consider steric effect and electronic effect. |
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Answer» 1. Butanne < Propanone < Propanal < ethanal 2. Acetophenone < p-Tolualdehyde < Benzaldehyde < pNitrobenzaldehyde |
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| 146. |
Which of the following is process used for the preparation of acetone?A. Haber processB. Wacker processC. Wolff-Kishner reactionD. Gattermann-Koch synthesis |
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Answer» Correct Answer - B In Wacker process, when mixture of propen and air is passed through mixutre of Pd and `CuCl_(2)` at high pressure, acetone is formed. `Pd+2CuCl_(2) to PdCl_(2)+2CuCl` `4CuCl+Hcl+O_(2) to 4CuCl_(2)+2H_(2)O` `underset("Propene")(CH_(3)CH=CH_(2))+PbCl_(2)+H_(2)O to CH_(3)COOH_(3)+Pd+2HCl` |
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| 147. |
Draw a mechanism for the following reaction. |
| Answer» First of all most acidic hydrogen is deprotected which gives `S_(N)2` reaction with aklyl halide. | |
| 148. |
Acetophenone cannot be prepared easily starting fromA. `C_(6)H_(5)CH(OH)CH_(3)`B. `C_(6)H_(5)CH_(3)`C. `C_(6)H_(5)C-=CH`D. `C_(6)H_(6)` |
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Answer» Correct Answer - B Acetophenone cannot be prepared easily starting from toluene because prepareation of acetophenone from toluene can only be done by using multistep reaction. From rest of the compounds its can be made easily. `CH_(6)H_(5)-overset(OH)overset(|)(CH)-CH_(3) overset([O])to C_(6)H_(5)-overset(O)overset(||)C-CH_(3)` `C_(6)H_(5)-=CH overset(Hg^(2+), H_(2)SO_(4)) toC_(6)H_(5)-overset(O) overset(||)C-CH_(3)` `C_(6)H_(6)+CH_(3)COCloverset("Anhy". AlCl_(3)) to C_(6)H_(5)COCH_(3)` |
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| 149. |
Which of the following structures is not correctly matched ?A. `alpha`- Methoxypropionaldehyde - `overset(" "H_(3)CO)overset(" " |)(H_(3)C- CH)-overset(O)overset("||")C-H`B. 3 - Hydroxybutanal - `CH_(3)-overset(OH)overset(|)(CH)-CH_(2)CHO`C. 4 - Oxopentanal - `CH_(3)CH_(2)CH_(2)-overset(O)overset("||")C-CHO`D. Di-sec. - butyldetone - `CH_(3)CH_(2)-overset(" CH"_(3))overset(|)(CH)-overset(O)overset("||")C-overset(" CH"_(3))overset(|)(CH)-CH_(2)CH_(3)` |
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Answer» Correct Answer - C 4-Oxopentanal : `CH_(3)-overset(O)overset("||")C-CH_(2)-CH_(2)-CHO` |
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| 150. |
Assertion: `HCHO` is always oxidized in the crossed Cannizzaro reaction. Reason : `HCHO` is the most reactive aldehyde, it axist in aqueous `OH^(-)` solution as the conjugate base of its hydrate , there is also a statistical factor because `HCHO` has two aldehydic hydrogen available for transfer whilein other aldehyde hydrate anion has only one such hydrogen atom.A. If Both assertion and reason are true reason is the correct explation of the assertion.B. If Both assertion and reason are true but reason is not the correct explation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true. |
| Answer» Correct Answer - A | |