The $$-$$ OH group of an alcohol or the $$-$$ COOH group of a carboxylic acid can be replaced by $$-$$ Cl using
A
phosphorus pentachloride
B
hypochlorous acid
C
chlorine
D
hydrochloric acid
Explanation
ROH + PCl5 $$ \to $$ RCl + POCl3
+ HCl
RCOOH + PCl5 $$ \to $$ RCOCl + POCl3
+ HCl
2
MCQ (Single Correct Answer)
AIPMT 2004
The molecular formula of diphenyl methane,
How many structural isomers are possible when one of the hydrogen is replaced by a chlorine atom ?
A
6
B
4
C
8
D
7
Explanation
Only four structural isomers are possible
for diphenyl methane.
3
MCQ (Single Correct Answer)
AIPMT 2003
Which one of the following orders of acid strength is correct ?
A
RCOOH > ROH > HOH > HC $$ \equiv $$ CH
B
RCOOH > HOH > ROH > HC $$ \equiv $$ CH
C
RCOOH > HOH > HC $$ \equiv $$ CH > ROH
D
RCOOH > HC $$ \equiv $$ CH > HOH > ROH
Explanation
Carboxylic acid is much stronger than water
and alcohol. Since the carboxylate ion after the
removal of proton is stabilised by resonating
structures as higher is the tendency to donate
proton, stronger is the acid.
The – OH in alcohols is almost neutral.
Acetylene is also weakest acid.
Thus the correct
order is
RCOOH > HOH > ROH > HC $$ \equiv $$ CH
depending upon the rate of donation of proton.
4
MCQ (Single Correct Answer)
AIPMT 2003
Name of the compound given below is
A
4-ethyl-3-methyloctane
B
3-methyl-4-ethyloctane
C
2, 3-diethylheptane
D
5-ethyl-6-methyloctane
Explanation
Questions Asked from Some Basic Concepts of Organic Chemistry
On those following papers in MCQ (Single Correct Answer) Number in Brackets after Paper Name Indicates No of Questions
