61. Reaction of $$trans$$ 2 - phenyl - 1 - bromocyclopentane on reaction with alcoholic $$KOH$$ produces
A
1 - phenylcyclopentene
B
3 - phenylcyclopentene
C
4 - phenylcyclopentene
D
2 - phenylcyclopentene
Answer :
1 - phenylcyclopentene
62.
Which of the following is not expected to be intermediate of the following reaction ?
A
B
C
D
Answer :
63. Ethylidene chloride is a/an ________.
A
$$vic$$ - dihalide
B
$$gem$$ - dihalide
C
allylic halide
D
vinylic halide
Answer :
$$gem$$ - dihalide
64.
Arrange the following in order of decreasing rate of solvolysis with aqueous ethanol ( fastest → slowest )
A
2 > 1 > 3
B
1 > 2 > 3
C
2 > 3 > 1
D
1 > 3 > 2
Answer :
2 > 3 > 1
65. Chloromethane on treatment with excess of ammonia yields mainly
A
$$N, N$$ - dimethylmethanamine 
B
$$N$$ - methylmethanamine $$\left( {C{H_3} - NH - C{H_3}} \right)$$
C
methanamine $$\left( {C{H_3}N{H_2}} \right)$$
D
mixture containing all these in equal proportion
Answer :
methanamine $$\left( {C{H_3}N{H_2}} \right)$$
66.
Consider the following bromides :
The correct order of $${S_N}1$$ reactivity is
A
A > B > C
B
B > C > A
C
B > A > C
D
C > B > A
Answer :
B > C > A
67.
In which of the following molecules carbon atom marked with asterisk \[\left( * \right)\] is asymmetric?
A
(I), (II), (III), (IV)
B
(I), (II), (III)
C
(II), (III), (IV)
D
(I), (III), (IV)
Answer :
(I), (II), (III)
68.
Match the isomers given in column I with their names given in column II and mark the appropriate choice.
A
A - iii, B - i, C - iv, D - ii
B
A - iv, B - iii, C - ii, D - i
C
A - i, B - ii, C - iii, D - iv
D
A - ii, B - iii, C - iv, D - i
Answer :
A - ii, B - iii, C - iv, D - i
69. Which one is correct?
A
Freon-14 is $$C{F_4},$$ Freon-13 is $$C{F_3}Cl,$$ Freon-12 is $$C{F_2}C{l_2}$$ and Freon-11 is $$CFC{l_3}.$$
B
Freons are chlorofluorocarbons.
C
Freons are used as refrigerants.
D
All the above.
Answer :
All the above.
70. $$AgN{O_3}$$ does not give precipitate with chloroform because :
A
$$CHC{l_3}$$ does not ionise in water.
B
$$CHC{l_3}$$ is insoluble in water.
C
$$AgN{O_3}$$ is insoluble in $$CHC{l_3}.$$
D
$$CHC{l_3}$$ is an organic compound.
Answer :
$$CHC{l_3}$$ does not ionise in water.