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 :

Which of the following reactions is an elimination reaction?

Geometrical isomerism can be shown by:

1.
2.
3.
4.

Free radical formation will take place in :

1.
2.
3.
4.

The effect that can explain the given order of acidity of the carboxylic acids is-

Cl₃CCOOH > Cl₂CHCOOH > ClCH₂COOH

1. +I effect

2. -I effect

3. +E effect

4. -E effect

The purification method based on the difference in solubilities of the compound and the impurities in a solvent is -
1. Crystallisation
2. Distillation
3. Chromatography
4. Isolation