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Molecules and Atomicity

Contrary to o...

Question

Contrary to other hydrogen halides,hydrogen fluoride is a liquid because:

A

sixe of F atom is small

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B

HF is a weak acid

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C

HF molecule are hydrogen bonded

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D

Fluorine is highly reactive

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Solution

The correct option is C HF molecule are hydrogen bonded
$H F$ has strong hydrogen bonding, so the force between molecules is stronger for this than in other hydrogen halides.Hence, $H F$ is a liquid at room temperature and other hydrogen halides are gases.

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Q. Hydrogen fluoride is a liquid unlike other hydrogen halides because:

Q. Ethers are heated with excess of conc. hydrogen halide to give alkyl halide, then the reactivity order of hydrogen halide is :

Q. The bond between hydrogen and fluorine in a molecule of hydrogen fluoride.

H F

is sometimes considered an ionic bond and other times is considered a covalent bond.
What is the reason for this confusion?

Q. Carbon - oxygen bond in ethers can be cleaved by halogen acids, sulphuric acid, phosphorouspentachloride etc. The cleavage of

C - O

bond takes place under drastic conditions with an excess of hydrogen halide,

R - O - R + 2 H X \to 2 R X + H_{2} O

If hydrogen halide is not taken in excess, then one molecule each of alcohol and alkyl halide are formed,

R - O - R + H I 373 K \to R - O H + R - I

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H - X

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Indicate whether the following statements / reactions are true or false.
Hydrogen fluoride is not effective in ether cleavage.

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