JEE Mains · Chemistry · STD 12 - 7. Alcohol, phenol and ethers

Given below are two statements : Statement \(I :\) Ethyl pent\(-4-\)yn\(-\)oate on reaction with \(\mathrm{CH}_{3} \mathrm{MgBr}\) gives a \(3^{\circ}\)-alcohol. Statement \(II :\) In this reaction one mole of ethyl pent\(-4-\)yn\(-\)oate utilizes two moles of \(\mathrm{CH}_{3} \mathrm{MgBr}\). In the light of the above statements, choose the most appropriate answer from the options given below:

A Both Statement \(I\) and Statement \(II\) are false.
B Statement \(I\) is false but Statement \(II\) is true.
C Statement \(I\) is true but Statement \(I I\) is false.
D Both Statement \(I\) and Statement \(II\) are true.

Verified Solution

Answer & Solution

Correct Answer

(C) Statement \(I\) is true but Statement \(I I\) is false.

Step-by-step Solution

Detailed explanation

Statement \(1\) is true But it consume \(3\) moles of \(G\) \(R\) So statement \(2\) is false.

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

List-I Deficiency Disease	List-II Vitamin
A. Scurvy	I. Pyridoxine
B. Convulsions	II. Vitamin A
C. Cheilosis	III. Ascorbic Acid
D. Xerophthalmia	IV. Riboflavin

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