Q. Which of the following is/are weaker acid than methanol?

Alcohols Phenols and Ethers Report Error

A

Option 1 Image

B

Option 2 Image

C

Option 3 Image

D

Option 4 Image

Solution:

Consider stability of conjugate base or $pKa$ value
$\text { Acidic order } \Rightarrow MeOH > H _{2} O > ROH > R - C \equiv CH$

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3. Assertion: Phenol reacts with $CH_3I$ in presence of NaOH to form methoxybenzene.
Reason : Phenoxide is better nucleophile than phenol.

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4. Assertion : Hydroquinone is more acidic than resorcinol.
Reason : $-OH$ group shows $+I -effect$.

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5. Dehydration of which one of the following alcohols produces an alkene exhibiting $cis-trans$ isomerism?

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4. At standard conditions, if the change in the enthalpy for the following reaction is $-109 \,kJ\, mol^{-1}$ $H_{2(g)}+Br_{2(g)} \to 2HBr_{(g)}$ Given that bond energy of $H_{2}$ and $Br_{2}$ is $435\,KJ\,mol^{-1}$ and $192\,KJ\,mol^{-1}$ , respectively, what is the bond energy (in $KJ \,mol^{-1})$ of $HBr$ ?

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