Exercise 1

Which of the following carbocations will be the most stable?

Arrange the following in increasing order of $\mathrm{pH}$ value:

The ionisation constant of an acid, $K_a,$, is the measure of strength of an acid. The $K_a$ values of acetic acid, hypochlorous acid and formic acid are $1.74 10{^}^{-5}$ $3.0\times {10}^{-8}$ and $18\times {10}^{-4}$ respectively. Which of the following orders of $\mathrm{pH}$ of $0.1 \mathrm{mol} {\mathrm{dm}}^{-3}$ solutions of these acids is correct?

Which of the following pairs of compounds are chain isomers?

$\mathrm{o}$-cresol and benzyl alcohol are

Monocarboxylic acids are the functional isomers of

${\mathrm{CH}}_3{\mathrm{CONH}}_2 \& {\mathrm{HCONHCH}}_3$ are called

Which of the following pair of compounds are not isomers?