1
MCQ (Single Correct Answer)

NEET 2016 Phase 1

In the reaction


X and Y are
A
X = 2-Butyne,  Y = 2-Hexyne
B
X = 1-Butyne,  Y = 2-Hexyne
C
X = 1-Butyne,  Y = 3-Hexyne
D
X = 2-Butyne,  Y = 3-Hexyne

Explanation

2
MCQ (Single Correct Answer)

NEET 2016 Phase 1

The pair of electrons in the given carbanion, CH3C $$ \equiv $$ C$$-$$, is present in which of the following orbitals?
A
sp2
B
sp
C
2p
D
sp3

Explanation


Thus, pair of electrons is present in sp-hybridised orbital.
3
MCQ (Single Correct Answer)

NEET 2016 Phase 1

The correct statement regarding the comparison of staggered and eclipsed conformations of ethane, is
A
the eclipsed conformation of ethane is more stable than staggered conformation even through the eclipsed conformation has torsional strain
B
the staggered conformation of ethane is more stable than eclipsed conformation, because staggered conformation has no torsional strain
C
the staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has torsional strain
D
the eclipsed conformation of ethane is more stable than stggered conformation, because eclipsed conformation has no torsional strain.

Explanation


In staggered conformation any two hydrogen atoms on adjacent carbon atoms are as far apart as possible there by minimising repulsion between the electron clouds $$\sigma $$- of bonds of two non-bonded H-atomic (torsional strain)
4
MCQ (Single Correct Answer)

NEET 2016 Phase 1

Consider the nitration of benzene using mixed conc.H2SO4 and HNO3. If a large amount of KHSO4 is added to the mixture, the rate of nitration will be
A
unchanged
B
doubled
C
faster
D
slower

Explanation

H2SO4 + HNO3 $$ \to $$ $$NO_2^ + $$ + $$HSO_4^ - $$ + $${H_3}{O^ + }$$

KHSO4 $$ \to $$ K+ + $$HSO_4^ - $$

Due to common ion effect backward reaction will take place so the formation $$NO_2^ + $$ decrease so nitration process will become slower.

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