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1

AIPMT 2004

MCQ (Single Correct Answer)
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

AIPMT 2003

MCQ (Single Correct Answer)
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.
3

AIPMT 2003

MCQ (Single Correct Answer)
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

4

AIPMT 2002

MCQ (Single Correct Answer)
IUPAC name of the following is

CH2 $$=$$ CH $$-$$ CH2 $$-$$ CH2 $$-$$ C $$ \equiv $$ CH
A
1-hexyne-5-ene
B
1, 5 -hexenyne
C
1-hexene-5-yne
D
1,5-hexynene.

Explanation



IUPAC Name is 1-hexene-5-yne.

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