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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.
| 101. |
Give chemical tests to distinguish between the following pair of compounds.1. Phenol and Benzoic acid2. Benzaldehyde and Acetophenone |
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Answer» 1. By adding feme chloride, phenol will give violet colour whereas benzoic acid will not react. 2. Adding I2 and NaOH, Acetophenone will give yellow ppt. of iodoform whereas benzaldehyde will not react. |
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| 102. |
Give chemical tests to distinguish between the following pair of compounds.1. Propanal and propanone2. Benzaldehyde and Benzoic acid |
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Answer» 1. On adding Tollen’s reagent, propanal will give silver mirror whereas propanone does not react. 2. On adding NaHCO3 solution, benzaldehyde will not react whereas benzoic acid will give brisk effervescence due to the evolution of CO2 |
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| 103. |
Which of the following will not give iodoform test?(a) Isopropyl alcohol (b) Ethanol(c) Eth anal (d) Benzyl alcohol |
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Answer» (d) Benzyl alcohol |
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| 104. |
Why does methanal not give aidol condensation while ethanol forms an aldol? |
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Answer» This is because only those compounds which haie α – hydrogen atoms can undergo aldol condensation reactions. Ethanol possesses α – hydrogen and therefore undergoes aldol condensation. Methanal does not have α – hydrogen atoms, hence does not undergo aldol condensation reactions. |
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| 105. |
Out of acetophenone and benzophenone, which one will give iodoform test? Write the reaction involved. (The compound should have CH3CO group to show the iodoform test) |
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Answer» Acetophenone (C6H5COCH3) contains the group (CH3CO) attached to the carbon atom and hence give lodoform test while benzophenone does not contain this group and hence does not give iodoform test. |
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| 106. |
The reaction of electrolysis of sodium acetate to form ethane is known as ……. (a) Kolbe’s electrolytic decarboxylation (b) Perkin’s reaction (c) Clemmenson reaction(d) Cannizaro reaction |
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Answer» (a) Kolbe’s electrolytic decarboxylation |
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| 107. |
Mention the uses of aromatic ketone. |
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Answer» 1. Acetophenone has been used in perfumery arid as a hypnotic under the name hyphone. 2. Benzophenone is used in perfumery and in the preparation of benzhydrol drop. |
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| 108. |
What are the products formed when 2-butanonc is oxidised by conc – HNO3 ?(a) CH3 - CH2 - CH2 - COOH(b) HCOOH + CH3 - CH3 - COOH(d) CH3CH2COOH + CH3COOH |
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Answer» (d) CH3CH2COOH + CH3COOH |
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| 109. |
Which rule governes the oxidation of unsymmetrical ketone?(a) Markovnikoff’s rule (b) Popoff s rule (c) Antimarkovnikoff s rule (d) Hund’s rule |
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Answer» (b) Popoff s rule |
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| 110. |
Which one of the following is formed when benzaldehyde reacts with ammonia?(a) Benzalamine (b) Benzylamine (c) Hydrobenzarnide (d) Benzarnide |
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Answer» (c) Hydrobenzarnide |
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| 111. |
Which of the following cannot be prepared by Rosenmund reduction method? (a) Acetaldehyde (b) Formaldehyde (c) Ketone (d) Both b & c |
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Answer» (d) Both b & c |
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| 112. |
Which one of the following is formed as a product when Benzoic anhydride is hydrolysed? (a) Benzoin (b) Benzoic acid (c) Benzyl alcohol (d) Benzaldehyde |
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Answer» (b) Benzoic acid |
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| 113. |
Which one of the following acid cannot be prepared from grignaid reagent by the action of dry ice?(a) CH3COOH (b) C6H 5COOH (c) CH3 – CH2COOH (d) HCOOH |
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Answer» HCOOH cannot be prepared from grignaid reagent by the action of dry ice |
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| 114. |
Which will not give acetamide on reaction with ammonia? (a) Acetic acid (b) Acetyl chloride (c) Acetic anhydride (d) methyl formate |
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Answer» (d) methyl formate |
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| 115. |
Which one of the following is an intermediate product in Stephen’s reaction?(a) Amines (b) Amides (c) Imines (d) Amino acid |
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Answer» Imines is an intermediate product in Stephen’s reaction. |
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| 116. |
Identify the product formed when benzaldehyde reacts with chromyl chloride? (a) Benzoic acid (b) Benzaldehyde (c) Phenyl methanol (d) Phenol |
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Answer» (b) Benzaldehyde |
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| 117. |
Which one of the following is used in detection and estimation of – OH and – NH group in organic compounds?(a) Acetic anhydride (b) Acetyl chloride (c) Acetamide (d) Ethyl acetate |
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Answer» (b) Acetyl chloride |
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| 118. |
Which one of the following reacts with methyl magnesium iodide followed by acid hydrolysis yield acetic acid?(a) Solid CO2 (b) HCHO (c) CH3CHO (d) CH3CN |
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Answer» (a) Solid CO2 |
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| 119. |
Which one of the following is used as selective reducing agent in the conversion of cyanide to aldehyde?(a) Raney Ni (b) LiAlH4 (c) SnCl2 / HCl (d) DIBAL – H |
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Answer» (d) DIBAL – H |
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| 120. |
Which one of the following is the product formed when acetamide is treated with P2O5 ?(a) Acetonitrile (b) Methylamine(c) Ethyl cyanide (d) Methanamine |
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Answer» (a) Acetonitrile |
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| 121. |
The relative acidities of various organic compounds are ………(a) RCOOH > ArOH > H2O > ROH > RC ≡ CH(b)RCCH > ArOH > ROH > H2O > RCOOH(c) ROH > R ≡ CH > ArOH > RCOOH > H2O(d) H2O > ROH > RCOOH > ArOH > RC ≡ CH |
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Answer» (a) RCOOH > ArOH > H2O > ROH > RC ≡ CH |
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| 122. |
Methyl cyanide on acid hydrolysis gives (a) Acetyl chloride (b) Acetic acid (c) Acetamide (d) Acetic anhydride |
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Answer» (c) Acetamide |
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| 123. |
The conversion of Ethyl acetate to propyl acetate by the action of propyl alcohol is named as(a) Esterification (b) Transesterfication(c) Acid hydrolysis of ester (d) Alkaline hydrolysis of ester |
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Answer» (b) Transesterfication |
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| 124. |
Ethyl acetate undergoes self condensation in the presence of strong base to give ………(a) Ethyl aceto acetate + Ethanol(b) Ethyl aceto acetate + Acetic acid (c) Ethyl aceto propionate + propanol (d) Ethyl ethanoate + Ethanoic acid |
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Answer» (a) Ethyl aceto acetate + Ethanol |
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| 125. |
In what way can acetic acid be distinguished from acetone? |
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Answer» Add I2 and NaOH. Acetone will give yellow precipitate of iodoform whereas acetic acid does not react to give any yellow precipitate.(or) Add sodium bicarbonate solution Acetone will not react, but acetic acid will give brisk effervescence due to the evolution of CO2. |
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| 126. |
Match the column I and II using the code given below the column.column Icolumn IIA. Tanning1. AcetoneB. Medicine for urinary infection2. FormalinC. Hypnotic3. UrotropinD. Nail polish remover4. paraldehydeABCDa2341b4213c3124d1432 |
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Answer» (a) 2 3 4 1 |
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| 127. |
Which one of the following is used to test ketones? (a) lodoform test (b) Tollen’s reagent test (c) Fehling’s solution test (d) Benedict’s solution test |
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Answer» (a) lodoform test |
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| 128. |
Which one of the following is formed when benzaldehyde reacts with acetic anhydride?(a) Cinnamaldehyde + Acetaldehyde (b) Cinnamic acid + Acetic acid(c) Benzyl alcohol + Benzoic acid (d) Benzal aniline + Acetic acid |
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Answer» (b) Cinnamic acid + Acetic acid |
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| 129. |
What is the name of the reaction of alcoholic KOH with Benzaldehyde’?(a) Cannizaro reaction (c) Benzoin condensation (b) Perkin’s reaction (d) Aldol condensation |
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Answer» (c) Benzoin condensation |
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| 130. |
Identify the product formed when benzaldehyde reacts with chlorine in the absence of catalyst? (a) p – chiorobenzaldehyde (b) O – chiorobenzaldehyde (c) Benzoyl chloride (d) m – chlorobenzaldehyde |
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Answer» (c) Benzoyl chloride |
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| 131. |
Identify the product formed when benzaldehyde reacts with chlorine in the presence of conc.FeCl3 ? (a) m – chlorobenzaldehyde (b) O – chlorobenzaldehyde (c) p – chiorobenzaldehyde (d) Benzoyl chloride |
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Answer» (a) m – chlorobenzaldehyde |
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| 132. |
Name the product formed when Benzaldehyde reacts with N,N – dimethyl aniline in the presence of conc.H2SO4 ? (a) Cinnamic acid (b) Skiffs base(c) Malachite green dye(d) p – hydroxy azodye |
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Answer» (c) Malachite green dye |
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| 133. |
Which one of the following is formed when benzaldehyde reacts with alcoholic KOH?(a) Benzyl alcohol (b) Potassium henzoate (c) Benzoin (d) Benzoic acid |
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Answer» Benzoin is formed when benzaldehyde reacts with alcoholic KOH |
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| 134. |
Assertion(A): Acetaldehyde does not undergo cannizaro reaction.Reason (R): Cannizaro reaction is a characteristic of aldehyde having no α – H atom. Acetaldehyde contains 3 α – H atoms. (a) Both A and R are correct and R is the correct explanation of A. (b) Both A and R are correct but R. is not correct explanation of A (c) A is correct but R is wrong (d) A is wrong but R is correct |
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Answer» (a) Both A and R are correct and R is the correct explanation of A. |
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| 135. |
The first step take place in Cannizaro reaction mechanism is ……… (a) Aftack of OH- on carbonyl carbon(b) Protonation of carbonyl oxygen (c) Acid base reaction (d) Hydride ion transfer |
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Answer» (a) Aftack of OH- on carbonyl carbon |
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| 136. |
What is the second step in Cannizaro reaction mechanism?(a) Attack of OH- on carbonyl carbon(b) Acid base reaction (c) Protonation of carbonyl oxygen (d) Hydride ion transfer |
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Answer» (d) Hydride ion transfer |
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| 137. |
Acidity increases with increasing number of electron withdrawing substituents on the α – carbon. Explain with example. |
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Answer» Acidity increases with increasing number of electron withdrawing substituents on the α – carbon atom. For example, Cl3C – COOH > Cl2CH – COOH > Cl – CH2COOH > CH2COOH The effect of various, electron withdrawing groups on the acidity of a carboxylic acid follows the order, – NO2 > – CN > – F > – Cl > – Br > – I > Ph |
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