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Addition of Halogen Acid for Alkynes

a Write the s...

Question

(a) Write the structure of main products when anline reacts with the following reagents.
(i) $B r_{2} w a t e r$
(ii) HCl
(iii) $(C H_{3} C O)_{2} O / p y r i d i n e$
(b) Arrange the following in the increasing order of their boiling poin.
$C_{2} H_{5} N H_{2}, C_{2} H_{5} O H, (C H_{3})_{3} N$
(c) Give a simple chemical test to distinguish between the following pair of compounds.
$(C H_{3})_{2} N H a n d (C H_{3})_{3} N$

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Solution

(b) Increasing order of boiling point.
$(C H_{3})_{3} N < C_{2} H_{5} N H_{2} < C_{2} H_{5} O H$
Alcohols have higher boiling point as compared to that of amines because oxygen, being more electronegative, forms strong hydrogen bond as compared to that of nitrigen.
In tertiary amine, there is no hydrogen to form hydrogen bond and hence, has the lowest boilint point.

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