51.

The letter 'D' in D-glucose signifies

• configuration at all chiral carbons

• dextrorotatory

• that it is a monosaccharide

• configuration at a particular chiral carbon

Reaction of methyl bromide with aqueous sodium hydroxide involves

• racemisation

• S_N 1 mechanism

• retention of configuration

• S_N 2 mechanism

In alkaline medium, alanine exists predominantly as

• anion

• Zwitter ion

• cation

• Covalent form

Benzaldehyde and acetone can be best distinguished using

• Fehling's solution

• Sodium hydroxide solution

• 2, 4-DNP

• Tollen's reagent

Phenol $\stackrel{\mathrm{X}}{\to }$ forms a tribromo derivative, 'X' is

• bromine in benzene

• bromine in water

• potassium bromide solution

• bromine in carbon tetrachloride at 0°C

One mole of an organic compound A with the formula C₃H₈O reacts completely With two moles of HI to form X and Y. When Y is boiled with aqueous alkali it forms Z. Z answers the iodoform test. The compound A is

• propan-2-ol

• propan-1-ol

• ethoxyethane

• methoxyethane

$$\begin{gathered} {\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{Br} \underset{∆}{\overset{\mathrm{aq} \mathrm{KOH}}{\to }} {\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH} \underset{∆}{\overset{{\mathrm{KMnO}}_4/{\mathrm{H}}^{+}}{\to }} \\ \mathrm{B} \underset{∆}{\overset{{\mathrm{NH}}_3}{\to }} \mathrm{C} \underset{\mathrm{alkali}}{\overset{{\mathrm{Br}}_2}{\to }} \mathrm{D}, \text{'}\mathrm{D}\text{'} \mathrm{is} \end{gathered}$$

• CH₂Br

• CH₃CONH₂

• CH₃NH₂

• CHBr₃

The correct sequence ofsteps involved in the mechanism of Cannizaro's reaction is

• nucleophilic attack, transfer of H^- and transfer of H⁺

• transfer of H^-, transfer of H⁺ and nucleophilic attack

• transfer if H⁺, nucleophilic attack and transfer of H^-

• electrophilic attack by OH^-, transfer of H⁺ and transfer of H^-

The IUPAC name of 

• 2-methyl-3-bromohexanal

• 3-bromo-2-methylbutanal

• 2-methyl-3-bromobutanal

• 3-bromo-2-methylpentanal

Which one of the following forms propane nitrile as the major product?

• Ethyl bromide + alcoholic KCN

• Propyl bromide + alcoholic KCN

• Propyl bromide + alcoholic AgCN

• Ethyl bromide + alcoholic AgCN