51.

Identify B and D in the following sequence of reactions

• methanol and bromoethane

• ethyl hydrogen sulphate and alcoholic KOH

• ethyl hydrogen sulphate and aqueous KOH

• ethanol and alcoholic KOH

The compound which gives turbidity immediately with Lucas reagent at room temperature is

• butan-1-ol

• butan-2-ol

• 2-methyl propan-2-ol

• 2-methyl propan-1-ol

Ethyl benzene cannot be prepared by

• Wurtz reaction

• Wurtz-Fittig reaction

• Friedel-Craft's reaction

• Clemmensen reduction

Which one of the following is not true for the hydrolysis of t-butyl bromide with aqueous NaOH? 

• Reaction occurs through the S_N1 mechanism

• The intermediate formed is a carbocation

• Rate of the reaction doubles when the concentration of alkali is doubled

• Rate of the reaction doubles when the concentration of t-butyl bromide is doubled 

Following is the substitution reaction in which -CN replaces -Cl.

R-Cl + $\underset{\left(\mathrm{alcoholic}\right)}{\mathrm{KCN}} \underset{∆}{\to }$ R-CN + KCl

To obtaine propanenitrile, R-Cl should be

• chloroethane

• 1-chloropropane

• chloromethane

• 2-chloropropane

The conversion of m-nitrophenol to resorcinol involves respectively

• hydrolysis, diazotization and reduction 

• diazotization, reduction and hydrolysis

• hydrolysis, reduction and diazotization

• reduction, diazotization and hydrolysis

The reagent with which both acetaldehyde and acetone react is

• Fehling's solution

• I₂/ NaOH

• Tollen's reagent

• carbonic acid

Which of the following gives an aldehyde on dry distillation?

• Calcium formate + calcium acetate

• Calcium acetate + calcium benzoate

• Calcmm acetate

• Calcium benzoate

α-maltose consists of

• one α-D-glucopyranose unit and one β-D-glucopyranose unit with 1-2 glycosidic linkage.

• two α-D-glucopyranose units with 1-2 glycosidic linkage

• two β-D-glucopyranose unit with 1-4 glycosidic linkage.

• two α-D-glucopyranose units with 1-4 glycosidic linkage

Which one of the following does not correctly match with each other?

• Silk-polyamide

• Lipase enzyme

• Butter fat

• oxytocin-enzyme