An electrophile among the following is :
1. | \(\mathrm{OH}^-\) | 2. | \(\mathrm{NC}^-\) |
3. | \(R_3C^-\) | 4. | Carbonyl group |
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
Functional isomer is not possible for:
1. Alcohols
2. Aldehydes
3. Alkyl halides
4. Cyanides
The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapor in the vapor phase. A suitable method for the extraction of these oils from the flowers is
1. | Distillation | 2. | Crystallisation |
3. | Distillation under pressure | 4. | Steam distillation |
Paper chromatography operates based on which of the following principles?
1. Adsorption
2. Partition
3. Solubility
4. Volatility
The correct order of decreasing stability of the following carbocations is:
I | \( \begin{aligned} &~~~~~~~~~~~~\oplus\\ & CH_3 - CH-CH_3 \end{aligned}\) |
II | \( \begin{aligned} &~~~~~~~~~~~~\oplus\\ & CH_3 - CH-OCH_3\end{aligned}\) |
III | \( \begin{aligned} & ~~~~~~~~~~~~\oplus\\ &CH_3 - CH-CH_2- OCH_3\end{aligned}\) |
1. | II > I > III | 2. | I > II > III |
3. | II < I < III | 4. | I < II < III |