Grignard reagent RMgBr (P ) reacts with water and forms a gas (Q). One gram of Q occupies 1.4 dm^3 at STP. (P) on reaction with dry ice in dry ether followed by H_3O^+forms a compound (Z). 0.1 mole o…

Question

Grignard reagent RMgBr (P ) reacts with water and forms a gas (Q). One gram of Q occupies 1.4 dm^3 at STP. (P) on reaction with dry ice in dry ether followed by H_3O^+forms a compound (Z). 0.1 mole of (Z) will weigh \_ \_ \_ \_ g. (Nearest integer)

Accepted Answer

Correct answer: 6. (6) Grignard reagent RMgBr reacts with water to produce gas Q. One gram of Q occupies 1.4 L at STP. Moles of Q=1.4/22.4=0.0625 mol, so molar mass =1/0.0625=16 g/ mol, identifying Q as CH_4. Thus P= CH_3 MgBr. When P reacts with dry ice: CH_3 MgBr+ CO_2 CH_3 COOMgBr. Upon treatment with H_3O^+, this gives Z= CH_3 COOH (acetic acid). Molar mass of Z=60 g/ mol. Mass of 0.1 mol=0.1 60=6 g.

$Grignard reagent RMgBr (P) reacts with water and forms a gas (Q). One gram of Q occupies 1.4 dm^{3} at STP. (P) on reaction with dry ice in dry ether followed by H_{3} O^{+} forms a compound (Z). 0.1 mole of (Z) will weigh____g. (Nearest integer)$

Solution

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