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JEE Main 2025 Jan 23 Shift 2, Chemistry Q4: Properties and Important Reactions of Aldehydes & Ketones

JEE Main2025Jan 23, Shift 2Chemistry
Q.

Given below are two statements:

Consider the following reaction

Statement (I) : In the case of formaldehyde , K is about 2280, due to small substituents, hydration is faster.

Statement (II) : In the case of trichloro acetaldehyde , K is about 2000 due to effect of Cl.


In the light of the above statements, choose the correct answer from the options given below:

  1. A

    Statement I true but Statement II is false

  2. B

    Both Statement I and Statement II are true

  3. C

    Statement I is false but Statement II is true

  4. D

    Both Statement I and Statement II are false

Solution

For carbonyl hydration , the equilibrium constant grows when the carbonyl carbon is more electrophilic and has little steric crowding.

Formaldehyde carries only hydrogens on the carbonyl carbon, with no electron-donating alkyl groups and minimal steric bulk, so the carbonyl is highly electrophilic. The reported is consistent with this. Statement I is correct.

Chloral has three chlorines on the adjacent carbon, whose strong effect withdraws electron density from the carbonyl carbon and makes it strongly electrophilic. The hydrate (chloral hydrate, a stable isolable solid) is favoured with . Statement II is correct.

Both statements are true.

Concept behind this question

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