CBSE Questions for Class 12 Medical Chemistry Aldehydes, Ketones And Carboxylic Acids Quiz 13 - MCQExams.com

The product in the following reaction is
1480264_9f8b7fce4bcd4908ad36b22fe0b035c9.JPG
  • $${ CH }_{ 3 }{ CH }_{ 2 }CN$$
  • $${ CH }_{ 3 }{ CH }\left( CN \right) CHO$$
  • $${ CH }_{ 3 }{ CH }\left( OH \right) CN$$
  • $${ CH }_{ 3 }{ CH }\left( OH \right) COOH$$
Molecular formula $$C_{5}H_{10}O$$ can have: 
  • 6- Aldehyde, 4- Ketone
  • 5- Aldehyde, 3- Ketone
  • 4- Aldehyde, 3- Ketone
  • 5- Aldehyde, 2- Ketone
Which of the following has maximum enol content ?
  • $$CH_3CHO$$
  • $$CH_3COCH_2CHO$$
Arrange the following in increasing order of their $$pK_a$$ values.
1497660_9e95dfe4f6dd48078b694f2e2f409ff8.JPG
  • $$y\lt x\lt z$$
  • $$x\lt y\lt z$$
  • $$y\lt z\lt x$$
  • $$x\lt z\lt y$$
Acetaldehyde reacts with $$PCl_{5}$$  to give: 
  • ethyl chloride
  • ethylene chloride
  • ethylidene dichloride
  • trichloroacetaldehyde
Among the following achiral amino acid is:
  • Ethylalanine
  • Methylglycine
  • 2 - Hydroxymethylserine
  • Tryptohan
Product I and II re respectively:
1560641_7650d80b61b14e1398cf51e58b06e58e.png
The smallest homologue of the monocarboxylic acid family which shows resonance is:
  • Methanoic acid
  • Ethanoic acid
  • Propanoic acid
  • None of the above
Lactic acid is formed, on hydrolysis of the cyanohydrin of
  • Methanal
  • Ethanal
  • Propanal
  • Propanone
In the following reaction, the compound $$Z$$ is:
1574668_b7b4264e6e9a4dfa8724865d0e3be3ff.GIF
  • benzoic acid
  • benzaldehyde
  • acetophenone
  • benzene
$$CH_3CH_2COONH_4\xrightarrow [ { P }_{ 2 }{ O }_{ 5 } ]{ \triangle  } X\xrightarrow { { H }^{ + }/{ H }_{ 2 }O } Y$$
Y and X respectively are:
  • $$CH_3CH_2COOH,CH_3CH_2CN$$
  • $$CH_3CH_2CN,CH_3CH_2COOH$$
  • $$CH_3CH_2CH_2COOH, CH_3CH_2CH_3$$
  • $$CH_3CH_3, CH_3CH_2COOH$$
The IUPAC name of the compound shown here is 
1566240_7f00538869bb4a59b10f8cb80df78687.JPG
  • 5-Ethyl -1- hydroxyoctan -1, 4-dioic acid
  • 2-Carboxyethyl -3- hexyl ketone
  • 3-(3-Hexylcarbonyl) propanoic acid
  • 5-Ethyl-4-oxooctanoic acid
Arrange the given compounds in decreasing order of nucleophilic addition reaction:
1586440_5e7567a2e0f248339cef92be3803d58e.PNG
  • II> V> I> IV> III
  • III> IV> I> V> II
  • II> I> V> III> IV
  • IV> III> V> I> II
The incorrect IUPAC name is 
  • $$\underset{2 - methyl -3-butanone}{CH_3 \underset{O}{\underset{||}{C}} - \underset{CH_3}{\underset{|}{C}}H - CH_3}$$
  • $$\underset{2, 3-dimethylpotane}{CH_3 \underset{CH_2}{\underset{||}{C}} - \underset{CH_2CH_3}{\underset{|}{C}}H - CH_3}$$
  • $$\underset{2 - pentyne}{CH_3C \equiv C - CH_2 CH_3}$$
  • $$\underset{2-bromo -3-chlore-butane}{CH_3\underset{Cl}{\underset{|}{C}}H - \underset{Br}{\underset{|}{C}}H - CH_3}$$
Greatest amount of hydration is in:
  • equal
Which of the following is correct order regarding the acidity of carboxylic acids?
  • $$\left( \mathrm { CH } _ { 3 } \right) _ { 3 } \mathrm { CCOOH } > \left( \mathrm { CH } _ { 3 } \right) _ { 2 } \mathrm { CHCOOH } > \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { COOH }$$
  • $$\left( \mathrm { CH } _ { 3 } \right) _ { 3 } \mathrm { CCOOH } > \left( \mathrm { CH } _ { 3 } \right) _ { 2 } \mathrm { CHCOOH } < \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { COOH }$$
  • $$\left( \mathrm { CH } _ { 3 } \right) _ { 3 } \mathrm { CCOOH } < \left( \mathrm { CH } _ { 3 } \right) _ { 2 } \mathrm { CHCOOH } > \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { COOH }$$
  • $$\left( \mathrm { CH } _ { 3 } \right) _ { 3 } \mathrm { CCOOOH } < \left( \mathrm { CH } _ { 3 } \right) _ { 2 } \mathrm { CHCOOH } < \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { COOH }$$
The major product of the given reaction is:
1614219_f7e7a54df8b9467daf77ce3f13c3e025.png
Propanoic acid occurs naturally as a result of the bacterial fermentation of milk and is partly responsible for the flavour of Swiss cheese.
Which starting materials can be used to produce propanoic acid?
$${CH}_{3}{CH}_{2}{CH}_{2}OH$$
$${CH}_{3}{CH}_{2}CHO$$
$${CH}_{3}{CH}_{2}CN$$
1649062_612d51c766354e439dad7ef11c6f625c.png
  • 1, 2 and 3 are correct
  • 1 and 2 only are correct
  • 2 and 3 only are correct
  • 1 only is correct
$$P\xrightarrow {KMnO_{4}/KOH}Q\underset {\triangle}{\xrightarrow {Sodalime}} R \underset {anhy.\ AlCl_{3}}{\xrightarrow {CH_{3}Cl}} S$$

If $$P$$ and $$S$$ are toluene, $$Q$$ and $$R$$ ______ and ______ respectively.
  • Benzaldehyde, Benzoic acid
  • Benzaldehyde, Sodium benzoate
  • Benzoic acid, Benzene
  • Benzene, Benzoic acid
Which among the following compounds is used as selective weed killer?
  • Picric acid
  • $$2, 4$$-dichlorophenoxy acetic acid
  • $$2, 4, 6$$-trichlorophenoxy acetic acid
  • Salol
Carboxylic acids can be prepared from alcohols, nitriles or esters.
Which statements are correct?
$$1$$. Both primary and secondary alcohols can be oxidised to carboxylic acids.
$$2$$. Carboxylic acids can be made from nitriles by hydrolysis.
$$3$$. Ethyl propanoate gives propanoic acid when reacted with hydrochloric acid.
  • $$1, 2$$ and $$3$$ are correct
  • $$1$$ and $$2$$ only are correct
  • $$2$$ and $$3$$ only are correct
  • $$1$$ only is correct
The IUPAC name of
1605059_98ae03ff1c70465bbeda84d9da1dbf6d.GIF
  • 2, 4, 5-Hexane tricarboxylic acid
  • 2, 3,5 - Hexane tricarboxylic acid
  • 2-(1-carboxyethyl)-4-merthyl pentanedioic acid
  • 3, 5-Dicarboxy-2-methyl hexanoic acid
The major product $$'Y'$$ in the following reaction is:
1614835_f0e25232b3a74febaa752d6ddaa73501.PNG
Which of the following compounds will show the maximum enol content?
  • $$CH_3COCH_2COCH_3$$
  • $$CH_3COCH_3$$
  • $$CH_3COCH_2CONH_2$$
  • $$CH_3COCH_2COOC_2H_5$$
Nucleophilic addition reaction will be most favoured in
  • $$ CH_3 CH_2 CHO $$
  • $$ CH_3 CHO $$
  • $$ CH_3 CH_2 CH_2 -\overset { \overset { O }{ \parallel } }{ C } - CH_3 $$
  • $$ (CH_3)_2C = 0 $$
Which of the following gives nucleophilic addition reactions?
  • Methanal
  • Ethanal
  • Propanone
  • Propene
$$C_7H_{16} \xrightarrow[\begin{matrix}  773K  \\ 10\ atm\end{matrix} ]{\begin{matrix}  Cr_2O_3\\Fe_2O_3\end{matrix}} A  \xrightarrow{KMnO_4/H^{\oplus}}B$$

Then what is the incorrect statement?
  • $$B$$ will give effervescence with $$NaHCO_3$$
  • $$A$$ has degree of unsaturation equal to $$4$$
  • $$B$$ with slaked lime gives a symmetrical ketone.
  • None of these
Which of the following is used as a hypnotic? 
  • Paraldehyde
  • Metaldehyde
  • Acetaldehyde
  • Formaldehyde
Acetone+A $$ \rightarrow $$ oxime of acetone 
Acetone+B $$ \rightarrow $$ diacetone amine
Acetone+C $$ \rightarrow $$ mesitylene
Acetone+D $$ \rightarrow $$ isopropylidene chloride A,B,C and D are: 
  • $$ NH_2OH,NH_3,Conc.H_2SO_4,SOCl_2 $$
  • $$ HNO_2,NH_3,Conc.H_2SO_4,PCl_5 $$
  • $$ HNO_2,NH_3,Conc.H_2SO_4,Cl_2 $$
  • $$ NH_2OH,NH_3,H_2SO_4,Cl_2 $$
Which of the following is an example of nucleophilic addition to acetone?
  • Ketal formation
  • Reduction with hydrogen gas
  • Cyanohydrin formation
  • Bisulphite addition
Which has minimum reactivity towards nucleophiles?
  • Butanone
  • Propanone
  • Ethanal
  • Methanal

Unknown compound $$(A)$$ on oxidation with hot basic $$KMnO_{4}$$ gives only one compound whose structure is given in the figure.

Compound $$(A)$$ will be:

1719850_da9215857fe7480f96ca31e8942c92e2.jpg
  • $$CH_{3} - C \equiv C - (CH_{2})_{4} - C \equiv C - CH_{3}$$
  • $$CH_{3} - CH = CH - (CH_{2})_{4} - CH = CH_{2}$$
  • $$CH_{3} - CH = CH - (CH_{2})_{4} - CH = CH - CH_{3}$$
Monocarboxylic acids (saturated) are regarded as _____ oxidation products of paraffins.
  • first
  • second
  • third
  • fourth
The formation of cyanohydrin from a ketone is an example of:
  • electrophilic addition
  • nucleophilic addition
  • nucleophilic substitution
  • electrophilic substitution
The d(+) lactic is obtained from:
  • fementation of cane sugar
  • green vegetable
  • muscles
  • fermentation of milk sugar
The IUPAC name of caproic acid is:
  • pentanoic acid
  • hexanoic acid
  • heptanoic acid
  • octanoic acid
Some carboxylic acids and their IUPAC names are given below. Which of the following is not correctly matched?
  • Formic acid - Methanoic acid
  • Acetic acid - Ethanoic acid
  • Iso-butyric acid - 2 - Methyl butanoic acid
  • Malonic acid - Propandioic acid
Arrange the following compounds in increasing order of their reactivity in nucleophilic addition reactions: 
Ethanal (I), Propanal (II), Propanone (III), Butanone (IV)
  • $$I>III>IV>II$$
  • $$I>II>III>IV$$
  • $$III>II>I>IV$$
  • $$II>IV>III>I$$
 Paraldehyde is used as a:
  • medicine
  • poison
  • polymer
  • dye
$$ (CH_3)_2CO \xrightarrow [HCl]{NaCN}(A) \xrightarrow [ \triangle]{H_3O^+ } (B) $$are :
  • $$ (CH_3)_2C(OH)CN, (CH_3 )_2C(OH)COOH $$
  • $$ (CH_3)_2C(OH)CN, (CH_3)_2C(OH)_2 $$
  • $$ (CH_3)_2C(OH)CN, (CH_3)_2CHCOOH $$
  • $$ (CH_3)_2C(OH)CN, (CH_3)_2CO $$
In the given reaction, product $$P$$ is:
1720350_74d1f5e6c37448ea964a843d6376301e.PNG
Propionic acid with $${Br}_{2}/P$$ yields a dibromaproduct. Its structure would be:
  • $${CH}_{2}Br{CH}_{2}COBr$$
  • $${CH}_{2}BrCHBrCOOH$$
  • $$CH{Br}_{2}{CH}_{2}COOH$$
  • $${CH}_{3}C{Br}_{2}COOH$$
Which of the following gives smell of burnt sugar on charring?
  • Oxalic acid
  • Tartaric acid
  • Malonic acid
  • Succinic acid
Best starting material to synthesize 2-methylpentan-2-ol is
  • $${CH}_{3}{CH}_{2}{CH}_{2}CH_2CHO$$
  • $$CH_3COOH$$
Which of the following reduces carboxylic acid directly to primary alcohols?
  • $$LiAl{H}_{4}$$
  • $$Na+{C}_{2}{H}_{5}OH$$
  • $$Na{BH}_{4}$$
  • $${H}_{2}$$
Nucleophilic addition reaction will be most favoured in:
  • $$ CH_3CH_2CHO $$
  • $$ CH_3CHO $$
  • $$ (CH_3)_2 C=O $$
The $$d(+)$$ lactic acid is obtained from:
  • fermentation of cane sugar
  • green vegetables
  • muscles
  • fermentation of milk sugar
The synthesis of crotonaldehyde from acetaldehyde is an example of........... reaction.
  • nucleophilic addition
  • elimination
  • electrophilic addition
  • nucleophilic addition elimination.
In the reaction,

    $${ C }_{ 2 }{ H }_{ 5 }OH\xrightarrow [  ]{ P{ I }_{ 3 } } (A)\xrightarrow [  ]{ KCN } (B)\xrightarrow [  ]{ Hydrolysis } (C)$$

The product (C) is:
  • formic acid
  • oxalic acid
  • propionic acid
  • acetic acid
Which of the following is the strongest acid?
  • $$HCOOH$$ ($$p{K}_{a}3.77$$)
  • $${C}_{6}{H}_{5}COOH$$ ($$p{K}_{a}4.22$$)
  • $${CH}_{3}COOH$$($$p{K}_{a}4.71$$)
  • $${CH}_{3}{CH}_{2}COOH$$ $$(p{K}_{a}4.88$$)
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