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JEE CHEMISTRY MCQ: ALDEHYDES & KETONES & CARBOXYLIC ACIDS

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Understanding +4 | -1

Assertion (A): A bright silver mirror is produced during the warming of an aldehyde with freshly prepared ammoniacal silver nitrate solution.

Reason (R): A bright silver mirror is produced due to the formation of silver metal.

View answer and explanation

Correct option: A

Both

\mathrm{A}

and

\mathrm{R}

are correct; and

\mathrm{R}

is the correct explanation of

\mathrm{A}

The correct answer is Both

\mathrm{A}

and

\mathrm{R}

are correct; and

\mathrm{R}

is the correct explanation of

\mathrm{A}

because the formation of a silver mirror is due to the reduction of silver ions to silver metal by the aldehyde.

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By passing water gas

\left( {\mathrm{CO} + {\mathrm{H}_2}} \right)

through an electric discharge at low pressure, we get: Addition of alcohols to aldehydes and ketones takes place in presence of dry

\mathrm{HCl}

gas because it

(i) Protonates the oxygen of the carbonyl compounds

(ii) Increases the electrophilicity of the carbonyl carbon

(iii) Removes the excess moisture from the reaction

(iv) Helps the reaction to move in the forward direction Benzyl alcohol and sodium benzoate is obtained by the action of sodium hydroxide on benzaldehyde. This reaction is known as Which one of the following reactions is a condensation reaction? Carboxylic acids dimerise due to The number of aldehyde isomers for

{C_4}{H_8}O

will be