Chemistry : Organic Chemistry – Some Basic Principles and Techniques

Among the following the strongest nucleophile is

• C₂H₅SH

• CH₃COO^-

• CH₃NH₂

• NCC${\mathrm{H}}_2^{-}$

Following compounds are respectively ..... geometrical isomers

• P - cis ;Q - cis ; R - trans

• P - cis ; Q - trans ; R - trans

• P - trans ; Q - cis ; R - cis

• P - cis ; Q - trans ; R - cis

Which is more basic oxygen in an ester?

• Carbonyl oxygen, α

• Carboxyl oxygen, β

• Equally basic

• Both are acidic oxygen

Which of the following compounds undergoes nucleophilic substitution reaction most easily?

Sometimes explosion occurs while distilling ethers. It is due to the presence of

• peroxides

• oxides

• ketones

• aldehydes

The concentration of an organic compound in chloroform is 6.15 g per 100 mL of solution. A portion of this solution in a 5 cm polarimeter tube causes an observed rotation of -1.2°. What is the specific rotation of the compound?

• +12$°$

• -3.9$°$

• -39$°$

• +61.5$°$

Identify, which of the below does not possess any element of symmetry?

• (+) and (-) tartaric acid

• Carbon tetrachlorid

• Methane

• Meso- tartaric acid

Which of the following fraction of coal tar distillation is obtained at 270-360° C ?

• Light oil

• Middle oil

• Green oil

• Heavy oil

Which one of the following can be purified by sublimation ?

• F₂

• Cl₂

• Br₂

• I₂

Corrosive sublimate (HgCl₂) can be used distinguish between

• formic acid and acetic acid

• acetaldehyde and butanone

• formaldehyde and propanone

• All of the above