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31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - NEET MCQ


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50 Questions MCQ Test Topic-wise MCQ Tests for NEET - 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2

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31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 1

(CH3)3C—CHO does not undergo Aldol condensation due to      [1996]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 1

Aldol condensation is given by the
compounds which contain α hydrogen
atom. As the given compound does not
contain α hydrogen atom. Hence it does not undergo aldol condensation.

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 2

Consider the following transformations :

The molecular formula of  is              [1996]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 2

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31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 3

Aspirin is an acetylation product of [1998]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 3

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 4

An ester (A) with molecular fomula, C9H10O2 wastreated with excess of CH3MgBr and the complexso formed was treated with H2SO4 to give anolefin (B). Ozonolysis of (B) gave a ketone withmolecular formula C8H8O which shows +veiodoform test. The structure of (A) is [1998]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 4

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 5

Which one of the following esters cannotundergo Claisen self-condensation? [1998]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 5

The ester having α hydrogen atom show
Claisen condensation reaction. We know that ethyl benzoate (C6H5COOC2H5) does not contain α-hydrogen. Therefore
C6H5COOC2H5 does not undergo Claisen self condensation.

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 6

Ketones

 can be obtained in one step by   [1998]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 6

By oxidation of tertiary alcohol with stronger oxidising agents ketones may be formed along with carboxylic acid.

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 7

Iodoform test is not given by [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 7

Iodoform test is exhibited by ethyl alcohol acetaldehyde, acetone methyl ketones and those alcohols which possess CH3CH(OH)- group. As 3-pentanone does not contain
CH3CO-group as therefore it does not give iodoform test.

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 8

Acetaldehyde reacts with semicarbazide andforms semicarbazone. Its structure is [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 8

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 9

Reaction of phenylacetylene with dil. H2SO4 and HgSO4 gives [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 9

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 10

The cyanohydrin of a compound on hydrolysisgives an optically active α-hydroxy acid. Thecompound is [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 10

(As it has a chiral C-atom thus it is optically active)

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 11

Phenylmethyl ketone can be converted intoethylbezene in one step by which of the followingreagents? [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 11

This reaction is known as clemmensen's
reduction.

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 12

Polarization of electrons in acrolein may be written as: [2000]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 12

In CH2 = CH—CHO due to — M effect
of — CHO group polarization of electron
takes place as follows

Hence partial polarization is represented as

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 13

During reduction of aldehydes with hydrazine and potassium hydroxide, the first is the formation
of : [2000]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 13

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 14

Benzoic acid may be converted to ethyl benzoateby reaction with : [2000]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 14

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 15

The catalyst used in Rosenmund's reduction is   [2000]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 15

Catalyst used in Rosenmund reduction is Pd/
BaSO4. Rosenmund Reduction is used for
reduction of acid chloride.

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 16

Which of the following is correct? [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 16

Acetophenone is a ketone, cyclopentane
doesn’t contain (4n + 2)π electron hence is
not aromatic. Diastase is an enzyme used in
the preparation of Maltose (Malt sugar, C12
H22 O11) through hydrolysis of starch.

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 17

Which of the following is incorrect? [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 17

Tollen's reagent is used to detect of
aldehydes. Tollen's reagent is an ammonical
solution of silver nitrate. When aldehyde is
added to Tollen's reagent, silver oxide is
reduced to metallic silver which deposits as
mirror.

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 18

In the following reaction, product 'P' is [2002]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 18

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 19

In the above reaction product 'P' is       [2002]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 19

Grignard reagent forms addition product with
bubbled carbondioxide which on hydrolysis
with HCl yields benzoic acid.

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 20

A and B in the following reactions are          [2003]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 20

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 21

In a set of the given reactions, acetic acid yielded a product C.

Product C would be -                  [2003]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 21

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 22

When m-chlorobenzaldehyde is treated with 50% KOH solution, the product(s) obtained is (are)        [2003]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 22

It is a simple Cannizzro reaction.

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 23

In the reaction

an asymmetric centre is generated. The acid  obtained would be [2003]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 23

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 24

Which one of the following can be oxidised tothe corresponding carbonyl compound? [2004]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 24

Carbonyl compounds (aldehydes and
ketones) are obtained by the oxidation of 1°
and 2° alcohols respectively. Among the
given options, only (a) is 2° alcohol hence it
can be oxidized to ketone.

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 25

The OH group of an alcohol or the –COOH groupof a carboxylic acid can be replaced by–Cl using [2004]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 25

Among the given options, only PCl5 can
convert an alcoholic group as well as a
carboxyl group to chloride.

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 26

If formaldehyde and KOH are heated, then we get  [1988]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 26

Aldehydes containing no α-hydrogen atom on warming with 50% NaOH or KOH undergo disproportionation i.e. self oxidation -reduction known as Cannizzaro’s reaction

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 27

Formalin is an aqueous solution of    [1988]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 27

Formalin is an aqueous solution (40%) of formaldehyde.

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 28

Which of the following is the correct decreasing order of acidic strength of [1988]
(i) methanoic acid (ii) ethanoic acid
(iii) propanoic acid (iv) butanoic acid.

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 28

An electron releasing substituent (+I effect) intensity the negative charge on the anion resulting in the decrease of stability and thus decreases the acidity of the acid. Hence acidic character decreases as the + I-effect of the alkyl group increases as

CH3 < CH3CH2 < CH3CH2CH2
< CH3CH2CH2CH2
Hence the order of acidic strength becomes:
(i) > (ii) > (iii) > (iv)

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 29

Among the following the strongest acid is [1988]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 29

Chlorine is electron withdrawing group.
Further Inductive effect is stronger at α
position than β-position. i.e.,

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 30

The compound formed when malonic ester isheated with urea is [1989]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 30

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 31

The above shown polymer is obtained when acarbonyl compound is allowed to stand. It is awhite solid. The polymer is [1989]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 31

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 32

The above compound describes a condensation polymer which can be obtained in two ways : either treating 3 molecules of acetone (CH3COCH3) with conc. H2SO4 or passing propyne (CH3 C ≡ CH) through a red hot tube.
The polymer is   [1989]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 32

Acetone forms mesitylene (1,3,5-trimethyl benzene) on distillation with conc. H2SO4.

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 33

This polymer (B) is obtained when acetone issaturated with hydrogen chloride gas, B can be          [1989]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 33

When 3 molecules are combined in presence of dry HCl gas they condense to form phorone.

Note : Two molecules of acetone condense to form mesityl oxide.

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 34

The reagent (s) which can be used to distinguishacetophenone from benzophenone is (are)       [1990]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 34

 I2 and NaOH react with acetophenone
(C6H5COCH3) to give yellow ppt. of CHIbut benzophenone (C6H5COC6H5) does not and hence can be used to distinguish between them. Oxidation of methyl ketones with sodium Hypoiodite (NaOI) or (I2 +NaOH) gives iodoform (CHI3) but not in case of benzophenone.

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 35

Acetaldehyde reacts with [1991]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 35

Acetaldehyde reacts only with nucleophiles. Since the mobile p electrons of carbon– oxygen double bond are strongly pulled towards oxygen, carbonyl carbon is electrondeficient and carbonyl oxygen is electronrich.
The electron deficient (acidic) carbonyl
carbon is most susceptible to attack by
electron rich nucleophilic reagents, that is, by base. Hence the typical reaction of aldehydes and ketones is nucleophilic
addition.

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 36

In which of the following, the number of carbonatoms does not remain same when carboxylic acidis obtained by oxidation [1992]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 36

Ketones on oxidation give carboxylic acids with lesser number of carbon atoms, i.e.,

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 37

Benzoic acid gives benzene on being heated withX and phenol gives benzene on being heatedwith Y. Therefore X and Y are respectively [1992]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 37

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 38

Sodium formate on heating yields [1993]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 38

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 39

Among acetic acid, phenol and n-hexanol, whichof the following compounds will react withNaHCO3 solution to give sodium salt and carbondioxide ? [1993]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 39

Among acetic acid, phenol and n-hexanol only CH3 COOH reacts with NaHCO3 to evolve CO2 gas.

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 40

(CH3)2 C = CHCOCH3 can be oxidized to (CH3)2C = CHCOOH by [1993]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 40

Chromic acid and KMnO4 will cleave the molecule at the site of double bond while Cu at 300°C cannot oxidise COCH3 COOH. The only reagent suitable for this conversion is NaOI or NaOH + I2 (iodoform
test):

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 41

Pinacolone is [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 41

Pinacolone is 3,3-dimethyl-2 butanone.

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 42

Benzaldehyde reacts with ethanoic KCN to give[1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 42

When benzaldehyde is refluxed with aqueous alcoholic potassium cyanide, two molecules of benzaldehyde condense together to form benzain

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 43

Aldehydes and ketones will not form crystallinederivatives with [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 43

Dihydrogen sodium phosphate (NaH2PO4) does not have a lone pair of electrons on the P atom. As such it can not act as a nucleophile and hence does not react with aldehydes and ketones.

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 44

Which of the following compound will undergoself aldol condensation in the presence of colddilute alkali ? [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 44

Aldehydes which contain a α -hydrogen on a saturated carbon, i.e., CH3CH2CHO undergo aldol condensation.

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 45

Formic acid is obtained when [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 45

When glycerol is heated with oxalic acid
following reaction occurs.

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 46

The preparation of ethyl acetoacetate involves[1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 46

Claisen condensation: Intermolecular
condensation of esters containing α-
hydrogen atom in presence of strong base to form β-keto ester

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 47

Schotten-Baumann reaction is a reaction ofphenols with [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 47

The function of NaOH is
(i) To convert phenol to more stronger
nucleophile PhO
(ii) To neutralize the acid formed

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 48

An ester is boiled with KOH. The product iscooled and acidified with concentrated HCl. Awhite crystalline acid separates. The ester is[1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 48

Methyl acetate and ethyl acetate on
hydrolysis give CH3COOH which is a liquid. Similarly ethyl formate on hydrolysis will give formic acid which is also a liquid. Only ethyl benzoate on hydrolysis will give benzoic acid
which is a solid.

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 49

Acetone reacts with iodine (I2) to form iodoformin the presence of [1995]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 49

Thus acetone reacts with iodine to form
iodoform in the presence of NaOH.

31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 50

In the Freidel Craft's acylation reaction, theeffective electrophile is [1996]

Detailed Solution for 31 Year NEET Previous Year Questions: Aldehydes, Ketones & Carboxylic Acids - 2 - Question 50

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