Question:
Ethanal \(\xrightarrow{i. (CH_3)_2CHMgBr,\ ii.\ H_2O}\) X;
Propanone \(\xrightarrow{i.\ C_2H_5MgBr,\ ii.\ H_2O}\) Y.
Consider statements: I. Ease of dehydration \(Y>X\); II. Acidic character \(X>Y\); III. Reactivity towards Lucas reagent \(X>Y\).
I. Ease of dehydration is Y > X
II. Acidic character is X > Y
III. Reactivity towards Lucas reagent is X > Y
Ethanal \(\xrightarrow{i. (CH_3)_2CHMgBr,\ ii.\ H_2O}\) X;
Propanone \(\xrightarrow{i.\ C_2H_5MgBr,\ ii.\ H_2O}\) Y.
Consider statements: I. Ease of dehydration \(Y>X\); II. Acidic character \(X>Y\); III. Reactivity towards Lucas reagent \(X>Y\). I. Ease of dehydration is Y > X
II. Acidic character is X > Y
III. Reactivity towards Lucas reagent is X > Y
Propanone \(\xrightarrow{i.\ C_2H_5MgBr,\ ii.\ H_2O}\) Y.
Consider statements: I. Ease of dehydration \(Y>X\); II. Acidic character \(X>Y\); III. Reactivity towards Lucas reagent \(X>Y\). I. Ease of dehydration is Y > X
II. Acidic character is X > Y
III. Reactivity towards Lucas reagent is X > Y
Show Hint
Lucas reagent test follows the order:
\[
3^\circ > 2^\circ > 1^\circ
\]
because tertiary carbocations form most easily.
Updated On: Jun 8, 2026
- I, II only
- I, III only
- II, III only
- I, II, III
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Concept:
Grignard reagents convert aldehydes and ketones into alcohols.
Step 1: Identify X and Y.
Ethanal reacts with isopropyl magnesium bromide to form a secondary alcohol: \[ X = \text{secondary alcohol} \] Propanone reacts with ethyl magnesium bromide to form a tertiary alcohol: \[ Y = \text{tertiary alcohol} \]
Step 2: Evaluate statement I.
Tertiary alcohols dehydrate more easily: \[ Y > X \] Statement I is correct.
Step 3: Evaluate statement II.
Secondary alcohols are slightly more acidic than tertiary alcohols due to lesser electron donating effect. Hence: \[ X > Y \] Statement II is correct.
Step 4: Evaluate statement III.
Lucas reagent reacts faster with tertiary alcohols: \[ Y > X \] Thus statement III is incorrect. Hence, correct statements are: \[ \boxed{I,\ II\ only} \]
Step 1: Identify X and Y.
Ethanal reacts with isopropyl magnesium bromide to form a secondary alcohol: \[ X = \text{secondary alcohol} \] Propanone reacts with ethyl magnesium bromide to form a tertiary alcohol: \[ Y = \text{tertiary alcohol} \]
Step 2: Evaluate statement I.
Tertiary alcohols dehydrate more easily: \[ Y > X \] Statement I is correct.
Step 3: Evaluate statement II.
Secondary alcohols are slightly more acidic than tertiary alcohols due to lesser electron donating effect. Hence: \[ X > Y \] Statement II is correct.
Step 4: Evaluate statement III.
Lucas reagent reacts faster with tertiary alcohols: \[ Y > X \] Thus statement III is incorrect. Hence, correct statements are: \[ \boxed{I,\ II\ only} \]
Was this answer helpful?
0
0
Top AP EAPCET Chemistry Questions
- The four quantum numbers of the valence electron of potassium are :
- The volume of $0.02\, M$ acidified permanganate solution required for complete reaction of $60\, mL$ of $0.01\, MI^{-}$ ion solution to form $I_2$ in $mL$ is
- In which of the following the election gain enthalpy of elements is correctly arranged?
- The radii of $ \text{F,}{{\text{F}}^{-}}\text{O} $ and $ {{\text{O}}^{2-}} $ are in the order
- Which of the following has the highest first ionization potential?
View More Questions
Top AP EAPCET Grignard’s reagents and their uses Questions
- Hydrolysis of an alkyl bromide X (C\(_4\)H\(_9\)Br) follows first-order kinetics. Reaction of X with Mg in dry ether followed by treatment of D\(_2\)O gave Y. What is Y?
- The major product of the following reaction is
- Identify the major product \((Y)\) from the following reaction
- Identify the product \(P\) from the following sequence of reactions.
- What are B and C respectively in the given sequence of reactions?
Top AP EAPCET Questions
- A body is projected from the ground at an angle of $\tan^{-1} \left( \frac{8}{7}\right)$ with the horizontal. The ratio of the maximum height attained by it to its range is
- The four quantum numbers of the valence electron of potassium are :
- A lens forms real and virtual images of an object, when the object is at $u_{1}$ and $u_{2}$ distances respectively. If the size of the virtual image is double that of the real image, then the focal length of the lens is (take, the magnification of the real image as $m$ )
- Two spheres $P$ and $Q$, each of mass $200\, g$ are attached to a string of length one metre as shown in the figure. The string and the spheres are then whirled in a horizontal circle about $O$ at a constant angular speed. The ratio of the tension in the string between $P$ and $Q$ to that of between $P$ and $O$ is $(P$ is at mid-point of the line joining $O$ and $Q$ )
- The volume of $0.02\, M$ acidified permanganate solution required for complete reaction of $60\, mL$ of $0.01\, MI^{-}$ ion solution to form $I_2$ in $mL$ is
View More Questions