A mixture of calcium sulphate and camphor can be separated by- 
1. Filtration
2. Evaporation
3. Sublimation
4. Chromatography

A gas among the following that can be absorbed by potassium hydroxide is -
1. Carbon dioxide
2. Silicon dioxide
3. Hydrogen
4. Carbon monoxide 

0.3780 grams of an organic chloro compound gave 0.5740 grams of silver chloride in Carius estimation. % of chlorine present in the compound is -

In the Carius method, 0.468 grams of an organic sulphur compound gives 0.668 grams of barium sulphate.  The percentage of sulphur in the given compound is -

The most stable carbocation among the following is-
1. \(({CH_3})_3C\overset{+}{C}H_2\)
2. \(({CH_3})_3\overset{+}{C}\)
3. \({CH_3}CH_2\overset{+}{C}H_2\)
4. \(({CH_3})\overset{+}{C}HCH_2CH_3\)

${\mathrm{O}}_2{\mathrm{NCH}}_2{\mathrm{CH}}_2{\mathrm{O}}^{-}$ is more stable than ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{O}}^{-}$ because :

Alkyl groups act as electron donors when attached to a π system due to:

An electrophile among the following is :

Elimination reaction among the following is-

Geometrical isomerism can be shown by:

1.
2.
3.
4.