p Ka values of some phenols and ethanol are given in table. Compound Formula pKa o-nitrophenol o- O 2 N - C 6 H 4- OH 7.2 p-nitrophenol p- O 2 N - C 6 H 4- OH 7.1 phenol C 6 H 5- OH 10.0 ethanol C 2 H 5 OH 15.9 Select the incorrect statement(s) from the above table.

Question

p Ka values of some phenols and ethanol are given in table. Compound Formula pKa o-nitrophenol o- O 2 N - C 6 H 4- OH 7.2 p-nitrophenol p- O 2 N - C 6 H 4- OH 7.1 phenol C 6 H 5- OH 10.0 ethanol C 2 H 5 OH 15.9 Select the incorrect statement(s) from the above table. (A) The greater the p Ka value, stronger is the acid (B) Phenol is million times more acidic than ethanol (C) Phenol is less acidic the o-nitrophenols (D) o-and p-nitrophenol have nearly the equal acidic strength

Tardigrade Admin · Accepted Answer

Since, p Ka=- log Ka and Ka is the measure of acidic strength. So, greater the p Ka value, weaker is the acid.

Compound	Formula	$p K_{a}$
$o$ -nitrophenol	$o - O_{2} N - C_{6} H_{4} - O H$	$7.2$
$p$ -nitrophenol	$p - O_{2} N - C_{6} H_{4} - O H$	$7.1$
phenol	$C_{6} H_{5} - O H$	$10.0$
ethanol	$C_{2} H_{5} O H$	$15.9$

The greater the $p K_{a}$ value, stronger is the acid

Phenol is million times more acidic than ethanol

Phenol is less acidic the $o$ -nitrophenols

$o$ -and $p$ -nitrophenol have nearly the equal acidic strength

Since, $p K_{a} = - lo g K_{a}$ and $K_{a}$ is the measure of acidic strength. So, greater the $p K_{a}$ value, weaker is the acid.

Q. pKa​ values of some phenols and ethanol are given in table. Compound Formula pKa​ o-nitrophenol o−O2​N−C6​H4​−OH 7.2 p-nitrophenol p−O2​N−C6​H4​−OH 7.1 phenol C6​H5​−OH 10.0 ethanol C2​H5​OH 15.9 Select the incorrect statement(s) from the above table.

The greater the pKa​ value, stronger is the acid

Phenol is million times more acidic than ethanol

Phenol is less acidic the o-nitrophenols

o-and p-nitrophenol have nearly the equal acidic strength

Since, pKa​=−logKa​ and Ka​ is the measure of acidic strength. So, greater the pKa​ value, weaker is the acid.

The greater the $p K_{a}$ value, stronger is the acid

Phenol is less acidic the $o$ -nitrophenols

$o$ -and $p$ -nitrophenol have nearly the equal acidic strength

Since, $p K_{a} = - lo g K_{a}$ and $K_{a}$ is the measure of acidic strength. So, greater the $p K_{a}$ value, weaker is the acid.