1
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.
2
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

3
MCQ (Single Correct Answer)

AIPMT 2002

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.
4
MCQ (Single Correct Answer)

AIPMT 2002

Geometrical isomers differ in
A
position of functional group
B
position of atoms
C
spatial arrangement of atoms
D
length of carbon chain.

Explanation

Geometrical isomers have same molecular formula but differ in the position of atoms or groups in space due to hindered rotation about a double bond.

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