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What is the formaldehyde level in phenolic ester in casting?
A malonic ester synthesis of a carboxylic acid proceeds by alkylation of the enolate of the malonic ester followed by ester hydrolysis and decarboxylation of the β-dicarboxylic acid. Which of the following carboxylic acids is difficult to prepare by this method?
A company paid Rs. 6,00,000 as bonus to its employees at different levels A, B and C. Each employee at level A receives one and half times of the amount that was paid to each employee at level B and each employee at level B was paid twice the amount paid to the employee at level C. If 50 employees were on level A, 75 on level B and 100 on level C, how much amount was paid to each employee of level A ?
Product X is produced by mixing chemical A and chemical B in the ratio of 5 : 4. Chemical A is prepared by mixing two raw materials, P and Q, in the ratio of 1 : 3. Chemical B is prepared by mixing raw materials, Q and R, in the ratio of 2 : 1. Then the final mixture is prepared by mixing 8640 units of product X with water. If the concentration of the raw material Q in the final mixture is 50%, how much water had been added to product X?
What is the phenol level in phenolic ester in casting?
In Ester cured alkaline phenolic, what is used as a coreactant?
Condensation polymerisation of formaldehyde with __________ does not produce phenolic resin.
For casting, in phenolic esters, formaldehyde levels are low.
What is the approximate phenol formaldehyde ratio used is the preparation of casting grade phenolic resins?
Hydrolysis of an ester gives a carboxylic acid which on Kolbe’s electrolysis yields ethane. The ester is which of the following?