Q19 of 37 Page 1

Assertion: C2H5OH is a weaker base than phenol but is a stronger nucleophile than phenol. (1)

Reason: In phenol the lone pair of electrons on oxygen is withdrawn towards the ring due to resonance.


In phenol the lone pair of electrons on oxygen is withdrawn towards the ring due to resonance. Due to which, electrons are not available for donation making it a weak base. But in ethanol, there is no resonance as the compound is non-aromatic. Due to which, lone pairs are available for donation and they can act as a better base than ethanol.

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17

Assertion: Glucose reacts with hydroxylamine to form an oxime and also adds a molecule of hydrogen cyanide to give cyanohydrin.

Reason: The carbonyl group is present in the open chain structure of glucose.


 18

Assertion: The acidic strength of halogen acids varies in the order HF>HCl>HBr>HI

Reason: The bond dissociation enthalpy of halogen acids decreases in the order HF>HCl>HBr>HI


 20

Assertion: Aryl halides undergo nucleophilic substitution reactions with ease.

Reason: The carbon halogen bond in aryl halides has partial double bonds character.


 21

Calculate the number of lone pairs on central atom in the following molecule and predict the geometry.

XeF4