Grignard reagent RMgBr (P) reacts with water and forms a gas (Q). One gram of Q occupies 1.4 at STP. (P) on reaction with dry ice in dry ether followed by forms a compound (Z). 0.1 mole of (Z) will weigh ______ g. (Nearest integer) [2026]

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 $H_{3} O^{+}$ forms a compound (Z). 0.1 mole of (Z) will weigh ______ g. (Nearest integer) [2026]

Smart Achievers · Accepted Answer

(6)

$1.4 {dm}^{3} (or 1.4 mL) occupied by 1 g$

$∴$ $Molecular weight of Q = \frac{22.4}{1.4} = 16$

$∴$ $Q is {CH}_{4} gas and Grignard reagent is {CH}_{3} MgBr$

${CH}_{3} MgBr \to_{(ii) H_{3} O^{+}}^{(i) {CO}_{2} (dry ice)} {CH}_{3} COOH$

$(Molecular weight 60)$

$∴$ $Weight of 0.1 mole of {CH}_{3} COOH = 6$

Solution

Q.
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) [2026]

Want Us to Email you About Special Offers & Updates?

Solution

Q. Grignard reagent RMgBr (P) reacts with water and forms a gas (Q). One gram of Q occupies 1.4 dm3 at STP. (P) on reaction with dry ice in dry ether followed by H3O+ forms a compound (Z). 0.1 mole of (Z) will weigh ______ g. (Nearest integer) [2026]

Ans. (6) 1.4 dm3 (or 1.4 mL) occupied by 1 g ∴ Molecular weight of Q=22.41.4=16 ∴ Q is CH4 gas and Grignard reagent is CH3MgBr CH3MgBr→(ii) H3O+(i) CO2 (dry ice)CH3COOH (Molecular weight 60) ∴ Weight of 0.1 mole of CH3COOH=6

Want Us to Email you About Special Offers & Updates?

Q.
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) [2026]