Dihydopyranyl react with alkanol to give what
Answers
n alcohols, -OH group is the functional group. Therefore, the chemical properties of alcohols generally involve the reactions of -OH group. These can undergo substitution as well as elimination reaction. Alcohols can react both as nucleophiles and electrophiles. The bond between O-H is broken when they react as nucleophiles. The bond between C-O is broken when they react as electrophiles. Protonated alcohols react in this manner.
(protonated alcohols as electrophiles)
Some common reactions of alcohols are as follows:
ACIDIC CHARACTER
Alcohols are very weak acids (Ka = 10-16– 10-18), ever’ feeble than water (Ka = 10-14) . They do not turn blue litmus-1 red but when treated with active metals like sodium, potassium and aluminium these liberate hydrogen along with the formation of alkoxides.
Alcohols behave as acids because of the presence of polar 0-H group. Due to greater electronegativity of oxygen atom the shared pair between 0 and H is drawn.
The order of acidic strength among various types of alkanols is
primary > secondary > tertiary
The order can also be explained in terms of electron releasing inductive effect of alkyl groups. Greater is the number of alkyl groups attached to the carbon carrying the -OH group lesser shall be the polarity of OH group and hence lesser will be the acidic character. In tertiary alcohols, the carbon atom carrying -OH is attached to three alkyl groups, due to which electron density on oxygen is maximum in their case and hence the loss of H+ is most difficult. Thus, tertiary alcohols are least acidic, whereas primary alcohols (with only one alkyl group) are most acidic. The secondary alcohols have intermediate acidic character.