JEE Advanced · Chemistry · 26. Aldehydes & Ketones

After completion of the reactions (I and II), the organic compound(s) in the reaction mixtures is(are):

A Reaction I: P and Reaction II: P
B Reaction I: U, acetone and Reaction II: Q, acetone
C Reaction I: T, U, acetone and Reaction II: P
D Reaction I: R, acetone and Reaction II: S, acetone

Verified Solution

Answer & Solution

Correct Answer

(C) Reaction I: T, U, acetone and Reaction II: P

Step-by-step Solution

Detailed explanation

Reaction I is the haloform reaction. It is a chemical reaction where haloforms

({CH}_{3} X)

are produced by the complete halogenation of acetone in the presence of a base. In basic medium, a complete haloform reaction takes place, since the rate of the reaction increases with each

α -

halogenation.

When acetone is reacted with bromine in acetic acid, the bromination of ketone occurs. The first step is the protonation of the carbonyl group and the formation of the enol form. The next step is the attack of enol on the bromine. The proton on the carbonyl is then lost to yield bromoacetone.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Explore more questions on app

From JEE Advanced

Explore more questions on app

	LIST -I		LIST -II
A)	$d s p^{2}$	P)	${[F e F_{6}]}^{4 -}$
B)	$s p^{3}$	Q)	$[T i {(H_{2} O)}_{3} C l_{3}]$
C)	$s p^{3} d^{2}$	R)	${[C r {(N H_{3})}_{6}]}^{3 +}$
D)	$d^{2} s p^{3}$	S)	${[F e C l_{4}]}^{2 -}$
		T)	$N i {(C O)}_{4}$
		U)	${[N i {(C N)}_{4}]}^{2 -}$

	List – I		List – II
A	Pathway P	P.
B.	Pathway Q	Q.
C.	Pathway R	R.
D.	Pathway S	S.