31.

A micelle formed during the cleansing action by soap is

• a discrete particle of soap

• aggregated particles of soap and dirt

• a discrete particle of dust

• an aggregated particle of dust and water

The conversion of O-acylated phenol in presence of AlCl₃ to C-acylated phenol is an example for this type of organic reaction

• addition reaction

• substitution reaction

• molecular rearrangement

• elimination reaction

The pairs 2R, 3R-butane diol and 2S, 3S-butane diol are enantiomeric.

• 2R, 3R and 2S, 3S

• 2S, 3S and 2S, 3R

• 2R, 3R and 2R, 3S

• 2S, 3S and 2R, 3S

The two enantiomers of secondary butyl chloride differ from each other in which one of the following properties?

• Boiling point

• Specific rotation

• Density

• Cl—Cl bond length

Identify the product (A) of the following reaction,

 ${\mathrm{C}}_2{\mathrm{H}}_5-\mathrm{O}-{\mathrm{C}}_2{\mathrm{H}}_5 + \mathrm{CO} \underset{500\mathrm{atm}}{\overset{{\mathrm{BF}}_3/150°\mathrm{C}}{\to }} \mathrm{A}$

• ethyl alcohol

• ethyl propionate

• ethanoic acid

• ethyl acetate

Which one of the following gives yellow precipitate with iodine and NaOH solution?

• CH₃—CHO

• C₆H₅COC₆H₅

• HCHO

• CH₃OH

Identify A, B and C in the following reactions

 ${\mathrm{CH}}_3\mathrm{Cl} + \stackrel{\mathrm{KCN}}{\to } \mathrm{A} \underset{{\mathrm{H}}_3{\mathrm{O}}^{\oplus }}{\overset{\mathrm{hydrolysis}}{\to }} \mathrm{B} \underset{∆}{\overset{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}/ {\mathrm{H}}^{+}}{\to }} \mathrm{C}$

• $\underset{\mathrm{A}}{{\mathrm{CH}}_3\mathrm{NC}}, \underset{\mathrm{B}}{{\mathrm{CH}}_3{\mathrm{NHCH}}_3 ,} \underset{\mathrm{C}}{{\mathrm{CH}}_3-\mathrm{N}\left({\mathrm{CH}}_3\right)-{\mathrm{C}}_2{\mathrm{H}}_5}$

• $\underset{\mathrm{A}}{{\mathrm{CH}}_3\mathrm{CN}}, \underset{\mathrm{B}}{{\mathrm{CH}}_3{\mathrm{CONH}}_2},\underset{\mathrm{C}}{ {\mathrm{CH}}_3{\mathrm{CO}}_2\mathrm{H}}$

• $\underset{\mathrm{A}}{{\mathrm{CH}}_3\mathrm{CN}}, \underset{\mathrm{B}}{{\mathrm{CH}}_3{\mathrm{CO}}_2\mathrm{H}},\underset{\mathrm{C}}{ {\mathrm{CH}}_3{\mathrm{CO}}_2{\mathrm{C}}_2{\mathrm{H}}_5}$

• $\underset{\mathrm{A}}{{\mathrm{CH}}_3\mathrm{CN}}, \underset{\mathrm{B}}{{\mathrm{CH}}_3{\mathrm{CO}}_2\mathrm{H}}, \underset{\mathrm{C}}{({\mathrm{CH}}_3\mathrm{CO}{)}_2\mathrm{O}}$

If the number average molecular weight and weight average molecular weight of a polymer are 40000 and 60000 respectively, the polydispersity index of the polymer will be

• >1

• <1

• 1

• zero

The AT/GC ratio in human beings is (where A = adenine, T = thymine, G = Guanine, C = cytosine).

• 1

• 1.52

• 9.3

• 2

Identify the non-narcotic analgesic from the following

• diazepam

• ibuprofen

• formalin

• terpineol