1
IIT-JEE 1987
MCQ (Single Correct Answer)
+1
-0.25
The IUPAC name of the compound
CH2 = CH $$-$$ CH(CH3)2
A
1, 1-dimethyl-2-propene
B
3-methylbut-1-ene
C
2-vinylpropane
D
1 isopropylethylene
2
IIT-JEE 1987
Subjective
+3
-0
An unknown compound of carbon, hydrogen and oxygen contains 69.77% carbon and 11.63% hydrogen and has a molecular weight of 86. It does not reduce Fehling solution, but forms a bisulphite addition compound and gives a positive iodoform test. What are the possible structures?
3
IIT-JEE 1987
Fill in the Blanks
+2
-0
If the vectors $$a\widehat i + \widehat j + \widehat k,\,\,\widehat i + b\widehat j + \widehat k$$ and $$\widehat i + \widehat j + c\widehat k$$
$$\left( {a \ne b \ne c \ne 1} \right)$$ are coplannar, then the value of $${1 \over {\left( {1 - a} \right)}} + {1 \over {\left( {1 - b} \right)}} + {1 \over {\left( {1 - c} \right)}} = ..........$$
4
IIT-JEE 1987
Fill in the Blanks
+2
-0
Let $$b = 4\widehat i + 3\widehat j$$ and $$\overrightarrow c $$ be two vectors perpendicular to each other in the $$xy$$-plane. All vectors in the same plane having projecttions $$1$$ and $$2$$ along $$\overrightarrow b $$ and $$\overrightarrow c, $$ respectively, are given by ...........
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