1

### 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

### 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

### 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

### 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.