1
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
A solution of (–$$l$$) – chloro –1 – phenylethane in toluene racemises slowly in the presence of a small amount of SbCl5, due to the formation of :
A
carbene
B
carbocation
C
free radical
D
carbanion
2
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
Stability of the species Li2, $$Li_2^−$$ and $$Li_2^+$$ increases in the order of:
A
Li2 < $$Li_2^+$$ < $$Li_2^-$$
B
$$Li_2^+$$ < $$Li_2^-$$ < Li2
C
$$Li_2^-$$ <$$Li_2^+$$ < Li2
D
$$Li_2^-$$ < Li2 < $$Li_2^+$$
3
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
In which of the following pairs of molecules/ions, both the species are not likely to exist?
A
$$H_2^+$$ , $$He_2^{2-}$$
B
$$H_2^-$$ , $$He_2^{2-}$$
C
$$H_2^{2+}$$ , $$He_2$$
D
$$H_2^-$$ , $$He_2^{2+}$$
4
JEE Main 2013 (Offline)
MCQ (More than One Correct Answer)
+4
-1
Which one of the following molecules is expected to exhibit diamagnetic behaviour?
A
N2
B
O2
C
S2
D
C2
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