The suitable Grignard reagent used for the synthesis of
with methanal is:
with methanal is:
Show Hint
- \( (CH_3)_2CH-CH_2MgBr/H_2O \)
- \( CH_3MgBr/H_2O \)
- \( (CH_3)_2CHMgBr/H_2O \)
- \( CH_3CH_2CH_2MgBr/H_2O \)
The Correct Option is C
Solution and Explanation
Top Questions on Carbohydrates
Which of the following statements is not true about glucose?
- CBSE CLASS XII - 2025
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- What happens when D-glucose is treated with the following reagents?
(a) Br$_2$ water
(b) HCN- CBSE CLASS XII - 2024
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- Carbohydrates are essential for life in both plants and animals. Carbohydrates are used as storage molecules as starch in plants and glycogen in animals. Chemically, they are polyhydroxy aldehydes or ketones. On the basis of their behavior on hydrolysis, carbohydrates are classified as monosaccharides, oligosaccharides, and polysaccharides.
All monosaccharides are reducing sugars, i.e., they are oxidized by Tollens' reagent and Fehling’s solution. A monosaccharide like glucose is an aldose, and its molecular formula was found to be C6H12O6. After reacting with different reagents like HI, H2N–OH, Bromine water, (CH3)2O, etc., its structure was found to contain one aldehyde group, one primary alcoholic group (–CH2OH), and four secondary alcoholic groups (>CHOH).
Despite having the aldehyde group, glucose does not give some of the reactions of aldehyde groups like Schiff’s test or NaHSO3 addition. This explains the existence of glucose in two cyclic hemiacetal forms, which differ only in the configuration of the hydroxyl group at C–1.- CBSE CLASS XII - 2024
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Questions Asked in CBSE CLASS XII exam
(a) State the following:
(i) Kohlrausch law of independent migration of ions
- CBSE CLASS XII - 2025
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A solution of glucose (molar mass = 180 g mol\(^{-1}\)) in water has a boiling point of 100.20°C. Calculate the freezing point of the same solution. Molal constants for water \(K_f\) and \(K_b\) are 1.86 K kg mol\(^{-1}\) and 0.512 K kg mol\(^{-1}\) respectively.
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Write the reactions involved when D-glucose is treated with the following reagents: (a) HCN (b) Br\(_2\) water
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Identify A and B in each of the following reaction sequence:
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Would you expect benzaldehyde to be more reactive or less reactive in nucleophilic addition reactions than propanal? Justify your answer.
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