JEE Mains Chemistry Past PapershardMCQ SINGLE

Given below are two statements : Statement I : Ethyl pent-4-yn-oate on reaction with CH3MgBr gives aJEE Mains Chemistry Past Papers Chemistry Question

Question

Given below are two statements : Statement I : Ethyl pent-4-yn-oate on reaction with CH3MgBr gives a 3º-alcohol. Statement II : In this reaction one mole of ethyl pent-4-yn-oate utilizes two moles of CH3MgBr. 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 true but Statement II is false (C) Statement I is false but Statement II is true (D) Both Statement I and Statement II are true dFku I : ,fFky isUV-4-vkbu-vks,V ls CH3MgBr dh vfHkfØ;k 3º ,YdksgkWy nsrh gSA dFku II : bl vfHkfØ;k esa ,fFky isUV-4-vkbu-vks,V dk 1 eksy CH3MgBr ds nks eksy mi;ksx dj ysrk gSA mijksDr dFkuksa ds lanHkZ esa uhps fn, fodYiksa esa ls lgh mÙkj pqfu,A (1) dFku I rFkk dFku II nksuksa vlR; gSA (2) dFku I lR; gS ijUrq dFku II nksuksa vlR; gSA (3) dFku I vlR; gS ijUrq dFku II nksuksa lR; gSA (4) dFku I rFkk dFku II nksuksa lR; gSA

Answer: B

💡 Solution & Explanation

OEt – C – C – C – C HC || O  utilizes 3 moles of CH3MgBr. One mole for acidic H of alkyne & 2 moles for ester group.

💬
Still have doubts about this question?
Send it to our AI chemistry tutor on WhatsApp — gets answered in minutes
Ask on WhatsApp →

Practice 22,000+ questions like this

AI-adaptive practice, video lectures, and full JEE Mains Chemistry content — all in one place.

JEE Advanced · JEE Mains · NEET · IChO · AP Chemistry