The halide shown is converted to its Grignard reagent with magnesium in dry ether; ethanal (CH3CHO) is added, followed by H3O+. Which structure is the product?

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JEE Main levelSingle correct optionDifficulty 2 of 3hx238

The halide shown is converted to its Grignard reagent with magnesium in dry ether; ethanal ( $CH X_{3} CHO$ ) is added, followed by $H X_{3} O X^{+}$ . Which structure is the product?

AStructure A
BStructure B
CStructure C
DStructure D

Answer: A

The cyclopentyl carbanion adds to the aldehyde carbonyl; an aldehyde other than methanal gives a secondary alcohol after hydrolysis: 1-cyclopentylethanol. The ketone would need oxidation, cyclopentanol would need O2, and (cyclopentyl)methanol is the HCHO product.

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The halide shown is converted to its Grignard reagent with magnesium in dry ether; ethanal (CHX3​CHO) is added, followed by HX3​OX+. Which structure is the product?

Answer: A

More questions on Grignard reagent products from drawn halides

The halide shown is converted to its Grignard reagent with magnesium in dry ether; ethanal ( $CH X_{3} CHO$ ) is added, followed by $H X_{3} O X^{+}$ . Which structure is the product?