Organometallic reagents: Grignard and organolithium

37 questions on Organometallic reagents: Grignard and organolithium from the Haloalkanes and Haloarenes chapter: 8 NEET level, 15 JEE Main, 14 JEE Advanced. Each one opens with its answer and solution.

• Grignard reagents are normally prepared in NEET level
• CH3MgBr reacts with water to form NEET level
• CH3CH2MgBr reacts with methanal (formaldehyde) and the adduct is hydrolysed with H3O+. The product is NEET level
• CH3MgBr is treated with solid CO2 and then with dilute acid. The product is NEET level
• Phenylmagnesium bromide is treated with ethanal and the product is hydrolysed with H3O+. The product is JEE Main level
• CH3CH2MgBr is added to propanone and the mixture is hydrolysed with H3O+. The product is JEE Main level
• For the formation of ethylmagnesium halide with magnesium in dry ether, the order of reactivity of the ethyl halides is JEE Main level
• Which of the following halides cannot be converted directly into a stable Grignard reagent with Mg in dry ether? JEE Main level
• CH3CH2MgBr reacts with ethylene oxide (oxirane), and the product is hydrolysed with H3O+. The product is JEE Main level
• Ethylmagnesium bromide is treated with D2O. The organic product is JEE Main level
• Which of the following liberates methane when treated with excess CH3MgBr in dry ether? JEE Main level
• A sample of 0.50 mol of 3-hydroxypent-4-ynoic acid, HC#C-CH(OH)-CH2-COOH, is treated with excess CH3MgBr in dry ether. Assume that every active hydrogen (hydrog... JEE Advanced level
• 1-Bromopropane is converted to a Grignard reagent with Mg in dry ether. It is then treated with propanone, followed by H3O+, to give A. Heating A with conc. H2S... JEE Advanced level
• 1-Bromobutane is treated with 2 equivalents of lithium metal in dry ether to give X. Two equivalents of X react with CuI to give the Gilman reagent Y, and Y the... JEE Advanced level
• Ethylmagnesium bromide is treated with ethanenitrile, CH3CN, and then with H3O+ to give X. X is warmed with I2 and aqueous NaOH to give a yellow precipitate and... JEE Advanced level
• Ethyl ethanoate is treated with excess CH3MgBr in dry ether and then with H3O+. Select the correct statements. JEE Advanced level
• Which of the following aryl bromides cannot be converted directly into the corresponding arylmagnesium bromide by treatment with Mg in dry ether? JEE Advanced level
• CH3MgBr reacts with propylene oxide (2-methyloxirane) at the less hindered ring carbon. After hydrolysis with H3O+, the product is JEE Advanced level
• Grignard reagents must be prepared and used under strictly anhydrous conditions because water NEET level
• Which alkyl halide reacts fastest with magnesium in dry ether, under identical conditions, to give a Grignard reagent? NEET level
• Methylmagnesium bromide is treated with methanal (formaldehyde) and the adduct is then hydrolysed with dilute acid. The product is NEET level
• CH3MgBr is poured over solid carbon dioxide (dry ice) and the product is hydrolysed with dilute H2SO4. The organic product is NEET level
• A sample of 6.40 g of the compound HC#C-CH2-CH(OH)-CH2-COOH (molar mass 128 g mol^-1) is treated with excess CH3MgBr in dry ether. Assume that only reactions wi... JEE Advanced level
• Which of the following halides can be converted directly into its Grignard reagent with Mg in dry ether without the reagent destroying itself? JEE Main level
• 2-Bromopropane is converted into its Grignard reagent with Mg in dry ether, and the reagent is then treated with D2O. The main organic product is JEE Main level
• CH3CH2MgBr reacts with ethylene oxide (oxirane) in dry ether and the adduct is hydrolysed with dilute acid. The product is JEE Main level
• Ethyl ethanoate is treated with excess CH3MgBr in dry ether and then with aqueous acid. The organic product other than ethanol is JEE Main level
• Lithium dimethylcuprate, (CH3)2CuLi, reacts with benzyl bromide, C6H5CH2Br. The organic product is JEE Main level
• Which of the following liberate an alkane when treated with CH3MgBr in dry ether? (Consider only the acid-base reaction.) JEE Main level
• Select the correct statements about Grignard reagents R-MgX. JEE Main level
• A 0.10 mol sample of a compound liberates 0.30 mol of CH4 with excess CH3MgBr (only reactions with active hydrogen are counted, one CH4 per active H). The compo... JEE Main level
• Propanenitrile, CH3CH2CN, is treated with CH3MgBr in dry ether and then with H3O+ to give compound X. X is warmed with I2 and aqueous NaOH. The organic products... JEE Advanced level
• Bromoethane is converted into CH3CH2MgBr, which reacts with ethylene oxide, and hydrolysis gives A. A is treated with SOCl2 to give B. B is converted into its G... JEE Advanced level
• Methyl 4-oxopentanoate, CH3-CO-CH2-CH2-COOCH3, is treated with excess CH3MgBr in dry ether followed by H3O+. The main product is JEE Advanced level
• 1-Bromo-4-chlorobenzene is treated with Mg in dry ether, then with propanone, then H3O+, and the resulting alcohol is heated with concentrated H2SO4. The final ... JEE Advanced level
• Select the correct statements about organolithium and organocopper reagents. JEE Advanced level
• Which combinations give a secondary alcohol after hydrolysis with H3O+? (Use excess Grignard reagent where an ester is involved.) JEE Advanced level