(a) Is benzaldehyde less or more reactive to electrophilic substitution reactions than benzene `(C_6H_6)`? Give an explanation for your answer.
(b) State the position on the ring at which electrophilic substitution is likely to predominate in benzaldehyde. Explain why.
(c)Between 2-methyl-butan-2-ol and 2-methyl-butan-1-ol, which cannot be produced by the reduction of either an alcohol or an aldehyde? Why?

(a) Haloarenes undergo electrophilic substitution reaction at ortho and para position. Explain. (b) Complete the following reaction: CH_(2)Br overset("Dry ether")to A overset(Na, C_(2)H_(5)OH)to B .

An organic compund (A) having molecular formula C_(4)H_(8) , decolourises bromine water. (A) when treated with carbon monoxide and hydrogen in the presence of a suitable catalyst undergoes oxo-reaction, to give aldehydes (B) and (C). (B) on reduction forms pentan-1-ol, while 2-methyll butan-1-ol is obtained by the reduction of (C). Give the structural formulae of (A),(B) and (C)

Benzene and other aromatic hydrocarbons, though contain pi -bonds, yet they behave as saturated hydrocarbons. They are stable because of delocalisation of cloud. These undergo electrophilic substitution reactions as : C_(6)H_(5)-H + YZ to C_(6)H_(5)Y +HZ The reactivity of aromatic hydrocarbons towards electrophilic substitution depends upon the electron density in the benzene ring Which reagent cannot be used in Friedel Craft alkylation of benzene?