Question

Forwhich value of "n" in HOOC−(CH2)n−COOH, only dehydration take place on heating?

Answer 1

Explanation:

ppwpwpwoelepepe00eooeowpwpwp0e0eoe9s!w! !wlwkwkwkw l2lwlwl2l2k

Answer 2

Only dehydration takes place on heating when the value of "n" is 2.

Given:  Dicarboxylic acid of the form HOOC−(CH2)n−COOH

To Find: The value of "n" for which only dehydration takes place on heating

Solution:

1. Dehydration reaction involves the removal of water from the compound at a  temperature of 573K which results in the formation of cyclic anhydrides.

2. Decarboxylation reaction involves the removal of carboxyl group and release of carbon dioxide gas on heating a compound.

3. Both dehydration and decarboxylation occur but it depends on the number of -(CH2)- groups in between the two carboxyl groups.

4. Dehydration reactions occur when there are 2 -(CH2)- groups in between the two carboxyl groups.

5. If there are more than 2 -(CH2)- groups in between the two carboxyl groups then decarboxylation reaction is preferred over dehydration.

Hence only dehydration takes place on heating when the value of "n" is 2.

#SPJ3