13. HYDROCARBONS[KARNATAKA CET EXCLUSIVE]
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CHEMISTRY(KCET)

285337 Replacement of Cl of chlorobenzene to give phenol requires drastic conditions, but Cl of 2,4 -dinitrochlorobenzene is readily replaced. This is because

1 \(-\mathrm{NO}_2\) group makes the ring electron rich at ortho and para positions
2 \(-\mathrm{NO}_2\) group withdraws electrons from meta position
3 \(-\mathrm{NO}_2\) donates electrons at meta position
4 \(-\mathrm{NO}_2\) withdraws electrons from ortho and para positions.
Karnataka CET 2016
CHEMISTRY(KCET)

285338 Electrophile that participates in nitration of benzene is

1 \(\mathrm{NO}^{+}\)
2 \(\mathrm{NO}_2^{+}\)
3 NO
4 \(\mathrm{NO}_3^{-}\)
Karnataka CET 2016
CHEMISTRY(KCET)

285339 Identify ' Q ' in the following sequence of reactions:
\(\xrightarrow{\text { - }} \xrightarrow{\mathrm{PCl}_5} \xrightarrow[\text { Excess }]{\mathrm{NaNH}_2} \mathrm{Q}\)

Ans:d
Exp:(d)
>

Karnataka CET 2015
CHEMISTRY(KCET)

285340 Number of possible alkynes with formula\(\mathrm{C}_5 \mathrm{H}_8\) is

1 3
2 5
3 2
4 4
Karnataka CET 2015
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CHEMISTRY(KCET)

285337 Replacement of Cl of chlorobenzene to give phenol requires drastic conditions, but Cl of 2,4 -dinitrochlorobenzene is readily replaced. This is because

1 \(-\mathrm{NO}_2\) group makes the ring electron rich at ortho and para positions
2 \(-\mathrm{NO}_2\) group withdraws electrons from meta position
3 \(-\mathrm{NO}_2\) donates electrons at meta position
4 \(-\mathrm{NO}_2\) withdraws electrons from ortho and para positions.
Karnataka CET 2016
CHEMISTRY(KCET)

285338 Electrophile that participates in nitration of benzene is

1 \(\mathrm{NO}^{+}\)
2 \(\mathrm{NO}_2^{+}\)
3 NO
4 \(\mathrm{NO}_3^{-}\)
Karnataka CET 2016
CHEMISTRY(KCET)

285339 Identify ' Q ' in the following sequence of reactions:
\(\xrightarrow{\text { - }} \xrightarrow{\mathrm{PCl}_5} \xrightarrow[\text { Excess }]{\mathrm{NaNH}_2} \mathrm{Q}\)

Ans:d
Exp:(d)
>

Karnataka CET 2015
CHEMISTRY(KCET)

285340 Number of possible alkynes with formula\(\mathrm{C}_5 \mathrm{H}_8\) is

1 3
2 5
3 2
4 4
Karnataka CET 2015
NEET DIGITAL LIBRARY
CHEMISTRY(KCET)

285337 Replacement of Cl of chlorobenzene to give phenol requires drastic conditions, but Cl of 2,4 -dinitrochlorobenzene is readily replaced. This is because

1 \(-\mathrm{NO}_2\) group makes the ring electron rich at ortho and para positions
2 \(-\mathrm{NO}_2\) group withdraws electrons from meta position
3 \(-\mathrm{NO}_2\) donates electrons at meta position
4 \(-\mathrm{NO}_2\) withdraws electrons from ortho and para positions.
Karnataka CET 2016
CHEMISTRY(KCET)

285338 Electrophile that participates in nitration of benzene is

1 \(\mathrm{NO}^{+}\)
2 \(\mathrm{NO}_2^{+}\)
3 NO
4 \(\mathrm{NO}_3^{-}\)
Karnataka CET 2016
CHEMISTRY(KCET)

285339 Identify ' Q ' in the following sequence of reactions:
\(\xrightarrow{\text { - }} \xrightarrow{\mathrm{PCl}_5} \xrightarrow[\text { Excess }]{\mathrm{NaNH}_2} \mathrm{Q}\)

Ans:d
Exp:(d)
>

Karnataka CET 2015
CHEMISTRY(KCET)

285340 Number of possible alkynes with formula\(\mathrm{C}_5 \mathrm{H}_8\) is

1 3
2 5
3 2
4 4
Karnataka CET 2015
Join With Us for More Updates
CHEMISTRY(KCET)

285337 Replacement of Cl of chlorobenzene to give phenol requires drastic conditions, but Cl of 2,4 -dinitrochlorobenzene is readily replaced. This is because

1 \(-\mathrm{NO}_2\) group makes the ring electron rich at ortho and para positions
2 \(-\mathrm{NO}_2\) group withdraws electrons from meta position
3 \(-\mathrm{NO}_2\) donates electrons at meta position
4 \(-\mathrm{NO}_2\) withdraws electrons from ortho and para positions.
Karnataka CET 2016
CHEMISTRY(KCET)

285338 Electrophile that participates in nitration of benzene is

1 \(\mathrm{NO}^{+}\)
2 \(\mathrm{NO}_2^{+}\)
3 NO
4 \(\mathrm{NO}_3^{-}\)
Karnataka CET 2016
CHEMISTRY(KCET)

285339 Identify ' Q ' in the following sequence of reactions:
\(\xrightarrow{\text { - }} \xrightarrow{\mathrm{PCl}_5} \xrightarrow[\text { Excess }]{\mathrm{NaNH}_2} \mathrm{Q}\)

Ans:d
Exp:(d)
>

Karnataka CET 2015
CHEMISTRY(KCET)

285340 Number of possible alkynes with formula\(\mathrm{C}_5 \mathrm{H}_8\) is

1 3
2 5
3 2
4 4
Karnataka CET 2015
For More Updates join with Us