A mixture of benzaldehyde and formaldehyde on heating with aqueous ${\rm{NaOH}}$ solution gives

Sodium benzoate and methyl alcohol

Sodium benzoate and sodium formate

Benzyl alcohol and methyl alcohol

A compound ‘A’ having the molecular formula ${{\rm{C}}_5}{{\rm{H}}_{12}}{\rm{O}}$, on oxidation gives a compound ‘B’with molecular formula ${{\rm{C}}_5}{{\rm{H}}_{12}}{\rm{O}}$. Compound ‘B’ gave a 2, 4-dinitrophenylhydrazine derivative but did not answer haloform test or silver mirror test. The structure of compound ‘A’

$\begin{array}{l} {\rm{C}}{{\rm{H}}_3} - {\rm{C}}{{\rm{H}}_2} - {\rm{CH}} - {\rm{C}}{{\rm{H}}_2} - {\rm{C}}{{\rm{H}}_3}\\ \;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;|\\ \;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;OH \end{array}$

${\rm{C}}{{\rm{H}}_3} - {\rm{C}}{{\rm{H}}_2} - {\rm{C}}{{\rm{H}}_2} - {\rm{C}}{{\rm{H}}_2} - {\rm{C}}{{\rm{H}}_2} - {\rm{OH}}$

$\begin{array}{l} {\rm{C}}{{\rm{H}}_3} - {\rm{C}}{{\rm{H}}_2} - {\rm{C}}{{\rm{H}}_2}{\rm{CH}} - {\rm{C}}{{\rm{H}}_3}\\ \;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;|\\ \;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;OH \end{array}$

$\begin{array}{l} {\rm{C}}{{\rm{H}}_3} - {\rm{C}}{{\rm{H}}_2} - {\rm{CH}} - {\rm{C}}{{\rm{H}}_2} - {\rm{OH}}\\ \;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;|\\ \;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;{\rm{C}}{{\rm{H}}_3} \end{array}$

What is the end product in the following sequences of operations; ${\rm{Acetamide}}\xrightarrow{{{{\rm{P}}_2}{{\rm{O}}_5}}}A\xrightarrow{{4{\rm{H}}}}B?$

${{\rm{C}}_2}{{\rm{H}}_5}{\rm{N}}{{\rm{H}}_2}$

${\rm{C}}{{\rm{H}}_3}{\rm{N}}{{\rm{H}}_2}$

${\rm{C}}{{\rm{H}}_3}{\rm{CN}}$

${\rm{C}}{{\rm{H}}_3}{\rm{COON}}{{\rm{H}}_4}$

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NEET • CHEMISTRY • ALDEHYDES & KETONES & CARBOXYLIC ACIDS

Aldehydes & ketones & carboxylic acids practice · Mixed difficulty

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Showing 121-137 of 137 questions

121 Easy

121 of 137

Analyzing +4 | -1

\mathrm{C}{\mathrm{H}_3}\mathrm{COOH}\;\mathrm{and}\;{\mathrm{C}_6}{\mathrm{H}_5}\mathrm{COOH}

can be distinguished by:

View answer and explanation

Correct option: D

All of these

Option D (All of these) is correct because

CH_3COOH

and

C_6H_5COOH

differ in flame test, solubility in water, and physical state.

122 Medium

122 of 137

Application +4 | -1

The product formed in the following ozonalysis is

C{H_2}BrCH = CHC{H_3}\xrightarrow{{{O_3}}}

View answer and explanation

Correct option: B

C{H_3}CHO

Option D (

C{H_3}CHO

) is correct because ozonolysis cleaves the double bond, forming aldehydes or ketones. In this case, it forms acetaldehyde.

123 Medium

123 of 137

Remembering +4 | -1

Reaction of formaldehyde and ammonia gives

View answer and explanation

Correct option: A

Hexamethylene tetramine

Option A (Hexamethylene tetramine) is correct because formaldehyde reacts with ammonia to form hexamethylenetetramine.

124 Hard

124 of 137

Understanding +4 | -1

A mixture of benzaldehyde and formaldehyde on heating with aqueous

\mathrm{NaOH}

solution gives

View answer and explanation

Correct option: A

Benzyl alcohol and sodium formate

Option A (Benzyl alcohol and sodium formate) is correct because benzaldehyde and formaldehyde undergo Cannizzaro reaction in presence of NaOH.

125 Hard

125 of 137

Analyzing +4 | -1

A compound ‘A’ having the molecular formula

{\mathrm{C}_5}{\mathrm{H}_{12}}\mathrm{O}

, on oxidation gives a compound ‘B’with molecular formula

{\mathrm{C}_5}{\mathrm{H}_{12}}\mathrm{O}

. Compound ‘B’ gave a 2, 4-dinitrophenylhydrazine derivative but did not answer haloform test or silver mirror test. The structure of compound ‘A’

View answer and explanation

Correct option: C

\begin{array}{l} \mathrm{C}{\mathrm{H}_3} - \mathrm{C}{\mathrm{H}_2} - \mathrm{CH} - \mathrm{C}{\mathrm{H}_2} - \mathrm{C}{\mathrm{H}_3}\\ \;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;|\\ \;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;OH \end{array}

Option C is correct because the compound 'A' is a secondary alcohol that gets oxidized to a ketone, which gives a positive 2,4-DNP test but negative haloform and silver mirror tests.

126 Medium

126 of 137

Remembering +4 | -1

What is the formula of adipic acid?

View answer and explanation

Correct option: A

\mathrm{COOH}{\left( {\mathrm{C}{\mathrm{H}_2}} \right)_4}\mathrm{COOH}

Option A (

\mathrm{COOH}{\left( {\mathrm{C}{\mathrm{H}_2}} \right)_4}\mathrm{COOH}

) is correct because it represents the chemical formula of adipic acid, a dicarboxylic acid with six carbon atoms.

127 Hard

127 of 137

Application +4 | -1

Calcium propanoate on refluxing yields:

View answer and explanation

Correct option: C

Pentanone-3

Option C (Pentanone-3) is correct because calcium propanoate undergoes dry distillation to form a symmetrical ketone, pentanone-3.

128 Hard

128 of 137

Understanding +4 | -1

Which factor/s will increase the reactivity of >C=O group?

I. Presence of a group with positive inductive effect.

II. Presence of a group with negative inductive effect.

III. Presence of large alkyl group.

View answer and explanation

Correct option: B

Only (ii)

Option B (Only (ii)) is correct because the presence of a group with a negative inductive effect increases the partial positive charge on the carbonyl carbon, making it more susceptible to nucleophilic attack.

129 Medium

129 of 137

Remembering +4 | -1

Formalin is the commercial name of

View answer and explanation

Correct option: C

40% aqueous solution of methanal

Option C (40% aqueous solution of methanal) is correct because formalin is the commercial name for a 40% aqueous solution of methanal (formaldehyde).

130 Hard

130 of 137

Application +4 | -1

The end product ‘C’ in the following sequence of chemical reactions is

\mathrm{C}{\mathrm{H}_3}\mathrm{COOH}\xrightarrow{{\mathrm{CaC}{\mathrm{o}_3}}}A\xrightarrow{{\mathrm{Heat}}}B\xrightarrow{{\mathrm{N}{\mathrm{H}_2}\mathrm{OH}}}C

View answer and explanation

Correct option: D

Acetoxime

Option D (Acetoxime) is correct because the sequence of reactions leads to the formation of acetoxime.

131 Hard

131 of 137

Application +4 | -1

Which one of the following can produce hydrogen when treated with metallic sodium?

View answer and explanation

Correct option: D

\mathrm{C}{\mathrm{H}_3}\mathrm{CON}{\mathrm{H}_2}

Option D (

\mathrm{C}{\mathrm{H}_3}\mathrm{CON}{\mathrm{H}_2}

) is correct because amides have an acidic hydrogen that can react with metallic sodium to produce hydrogen gas.

132 Easy

132 of 137

Understanding +4 | -1

Benzaldehyde can be obtained by the hydrolysis of:

View answer and explanation

Correct option: B

Benzal chloride

Option B (Benzal chloride) is correct because hydrolysis of benzal chloride (

\mathrm{C_6H_5CHCl_2}

) yields benzaldehyde (

\mathrm{C_6H_5CHO}

133 Medium

133 of 137

Remembering +4 | -1

Which one of the following is not a fatty acid?

View answer and explanation

Correct option: D

Phenyl acetic acid

Option D (Phenyl acetic acid) is correct because it is an aromatic acid, not a fatty acid, which are typically long-chain aliphatic carboxylic acids.

134 Medium

134 of 137

Understanding +4 | -1

Which one of the following is reduced with zinc and hydrochloric acid to give the corresponding hydrocarbon?

View answer and explanation

Correct option: D

Butan-2-one

Option D (Butan-2-one) is correct because ketones are reduced to corresponding hydrocarbons by zinc and hydrochloric acid (Clemmensen reduction).

135 Medium

135 of 137

Application +4 | -1

HCHO + X{C_6}{H_5} - C{H_2}OH.\,\,\,\,X\,\,is

View answer and explanation

Correct option: A

{C_6}{H_5} - MgBr

Option A (

{C_6}{H_5} - MgBr

) is correct because Grignard reagents react with formaldehyde to form primary alcohols after hydrolysis.

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136 Hard

136 of 137

Analyzing +4 | -1

What is the end product in the following sequences of operations;

\mathrm{Acetamide}\xrightarrow{{{\mathrm{P}_2}{\mathrm{O}_5}}}A\xrightarrow{{4\mathrm{H}}}B?

View answer and explanation

Correct option: B

{\mathrm{C}_2}{\mathrm{H}_5}\mathrm{N}{\mathrm{H}_2}

Option B (

{\mathrm{C}_2}{\mathrm{H}_5}\mathrm{N}{\mathrm{H}_2}

) is correct because acetamide undergoes dehydration with P2O5 to form acetonitrile, which is then reduced to ethylamine.

137 Hard

137 of 137

Understanding +4 | -1

Which one of following can be oxidised to the corresponding carbonyl compound?

View answer and explanation

Correct option: A

2-hydroxypropane

Option A (2-hydroxypropane) is correct because secondary alcohols can be oxidized to ketones.

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