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i. 0.21 gm of but-3-yn-2-ol is treated w...

i. `0.21` gm of but-3-yn-2-ol is treated with excess of `C_(2)H_(5)`MgBr at standard condition. The volume of gas evolved is:
(a) `134.4` ml, (b) `146.4` ml
(c) `67.2` ml, (d) `73.2` ml
ii. `0.46` gm of a compound with molecular mass of 92 gm gave 336 ml of a gas at STP when treated with excess of `CH_(3)`MgI. The number of moles in the compound is:
(a) `0.1`, (b) 2
(c) 3, (d) 4
iii. The treatement of `CH_(3)OH` with `CH_(3)Mgl` releases `1.04 ml` of a gas at STP. The mass of `CH_(3)OH` added is:
(a) `1.49` mg,
(b) `2.98` mg
(c) `3.71` mg, (d) `4047` mg
iv. The addition of `4.12` mg of an unknown alcohol, ROH, to `CH_(3)Mgl` releases `1.56` ml of a gas at STP. The molar mass of alcohol is:
(a) 32 gm `mol^(-1)` , (b) 46 gm `mol^(-1)`
(c) `59 gm mol^(-1)` , (d) 74 gm `mol^(-1)`
v. Teh sample of `1.79` mg of a compound of molar mass 90 gm `mol^(-1)` when treated with `CH_(3)Mgl` releases `1.34` mol of a gas at STP. The number of moles of active hydrogen in the molecule is:
(a) 1 , (b) 2
(c) 3 , (d) 4

Text Solution

AI Generated Solution

To solve the problem step by step, we will analyze the reaction of but-3-yn-2-ol with the Grignard reagent (C2H5MgBr) and calculate the volume of gas evolved. ### Step 1: Determine the structure of but-3-yn-2-ol But-3-yn-2-ol has the following structure: - It has a triple bond between the second and third carbon atoms. - The hydroxyl (-OH) group is on the second carbon. The structure can be represented as: ...
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