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NEETChemistry

Aldehydes, Ketones and Carboxylic Acids

7 NEET Chemistry previous year questions on Aldehydes, Ketones and Carboxylic Acids — options free on every question; 1 include the answer & explanation free, the rest unlock with PYQ Pass.

Q1 FREE PREVIEW
PYQ
The structure of protein that is unaffected by heating is:
aSecondary structure
btertiary structure
cPrimary structure
dQuaternary structure
✓ Correct answer: c) Primary structure
ExplanationThe primary structure of protein is un- affected by heating.In a process called denaturation, heat breaks the bonds that held together the secondary and tertiary structures, but it does not alter the original chain of amino acids i.e. its primary structure.
Q2
PYQ

Fehling's solution ' A ' is

[NEET 2024]

a

aqueous sodium citrate

b

aqueous copper sulphate

c

alkaline copper sulphate

d

alkaline solution of sodium potassium tartrate (Rochelle's salt)

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Q3
PYQ

Reaction between benzaldehyde and acetophenone in presence of dilute \( \mathrm{NaOH} \) is known as:

[NEET 2020]

a

Aldol condensation

b

Cannizzaro's reaction

c

Cross Cannizaro's reaction

d

Cross aldol reaction

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Q4
PYQ

Match List-I with List-II

List-I (Name of reaction) List-II (Reagent used)
(A) Hell-Volhard-Zelinsky reaction (I) \(\mathrm{NaOH}+{\mathrm{I}}_{2}\)
(B) Iodoform reaction (II) (i) \({\mathrm{CrO}}_{2}{\mathrm{Cl}}_{2},{\mathrm{CS}}_{2}\)
(ii) \({\mathrm{H}}_{2}\mathrm{O}\)
(C) Etard reaction (III) (i) \({\mathrm{Br}}_{2}/\) red phosphorus
(ii) \({\mathrm{H}}_{2}\mathrm{O}\)
(D) Gatterman-Koch (IV)\(\mathrm{CO},\mathrm{HCl}\), anhyd. \({\mathrm{AlCl}}_{3}\)

Choose the correct answer from the options given below:

[JEE Main 2023, 6 Apr (Shift 1)]

a

(A) - (III), (B) - (II), (C) - (I), (D) - (IV)

b

(A) - (III), (B) - (I), (C) - (IV), (D) - (II)

c

(A) - (I), (B) - (II), (C) - (III), (D) - (IV)

d

(A) - (III), (B) - (I), (C) - (II), (D) - (IV)

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Q5
PYQ

Reaction between acetone and methylmagnesium chloride followed by hydrolysis will give :

[NEET 2020]

a

Sec. butyl alcohol

b

Tert. butyl alcohol

c

Isobutyl alcohol

d

Isopropyl alcohol

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Q6
PYQ

\(\mathrm{RMgX}+\mathrm{CO}_2 \xrightarrow{\text { dry ether }} \mathrm{Y} \xrightarrow{\mathrm{H}_3 \mathrm{O}^{+}} \mathrm{RCOOH}\)

What is \(\mathrm{Y}\) in the above reaction ?

[NEET 2022]

a

\(\mathrm{R}_3 \mathrm{CO}^{-} \mathrm{Mg}^{+} \mathrm{X}\)

b

\({\mathrm{RCOO}}^{+}\)

c

\((\mathrm{RCOO}{)}_{2}\mathrm{Mg}\)

d

\({\mathrm{RCOO}}^{-}{\mathrm{Mg}}^{+}\mathrm{X}\)

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Q7
PYQ

\[R-\mathrm{CN} \underset{\text { } \mathrm{H}_{2} \mathrm{O}-\mathrm{DIBAL-H}}{\longrightarrow} R-Y\]

Consider the above reaction and identify \( Y \)

[JEE Main 2021, 27 Jul (Shift 2)]

a

\( -\mathrm{CONH}_{2} \)

b

\( -\mathrm{CHO} \)

c

\( -\mathrm{COOH} \)

d

\( -\mathrm{CH}_{2} \mathrm{NH}_{2} \)

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