Created by StemPy LabTwo statements about the preparation of alkenes by elimination are given below. Statement I: Alkyl halides, heated with aqueous potassium hydroxide, lose a molecule of hydrogen halide and give alkenes as the main products. Statement II: In the dehydration of ethanol by concentrated sulphuric acid, the hydrogen atom lost with the OH group comes from the same carbon that carries the OH group.
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← Assertion (A): When chlorobenzene and benzene are nitrated side by side under the same conditions, chlorobenzene reacts more slowly, so the chlorine atom deactivates the ring towards electrophilic substitution.
Reason (R): In chlorobenzene, resonance with the lone pairs of chlorine puts more electron density at the ortho and para positions than at the meta position, so an incoming electrophile goes mainly to the ortho and para positions.A sample of 15.0 mL of a gaseous hydrocarbon is mixed with 120.0 mL of oxygen and burnt completely. After cooling to room temperature, the gas has a volume of 97.5 mL. After it is passed through aqueous KOH, the volume falls to 52.5 mL. All volumes are measured at the same temperature and pressure. What is the formula of the hydrocarbon? →
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