The number of sigma ($\mathrm{\sigma }$) and pi ($\mathrm{\pi }$) bonds in pent-2-en-4-yne is:

1.  13 $\mathrm{\sigma }$ bonds and no $\mathrm{\pi }$ bond

2.  10 $\mathrm{\sigma }$ bonds and 3 $\mathrm{\pi }$ bonds

3.  8 $\mathrm{\sigma }$ bonds and 5 $\mathrm{\pi }$ bonds

4.  11 $\mathrm{\sigma }$ bonds and 2 $\mathrm{\pi }$ bonds

Which of the following is the correct IUPAC name?

1. 3-Ethyl-4,4-dimethylheptane

2. 4,4-Dimethyl-3-ethylheptane

3. 5-Ethyl-4,4-dimethylheptane

4. 4,4-Bis(methyl)-3-ethylheptane

Given below are two statements: 

Correct statement among the following is:

a. HC≡CCH=CHCH₃ contains 10 σ bonds and 3 π bonds.

b. CH₂=C=CHCH₃ contains 7 σ bonds and 2 π bonds.

Correct among the above mentioned statement is -

1. Only statement 'a' is true.

2. Only statement 'b' is true

3. Both statements are true

4. Both statements are false

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The correct hybridization  of carbon atoms are:    

1. C₁= sp , C₂= sp³ , C₂= sp²

2. C₁= sp² , C₂= sp³ , C₂= sp³

3. C₁= sp³ , C₂= sp² , C₂= sp³

4. C₁= sp³ , C₂= sp³ , C₂= sp³

The number of unbranched straight-chain molecules with different structural formulas for the molecular formula ${\mathrm{C}}_4{\mathrm{H}}_8{\mathrm{F}}_2$ are: 

Match the item in column I with the column II

	Column I		Column II
a.		i.
b.		ii.
c.		iii.
d.		iv.

Choose the correct answer from the options given below:
1. a-ii; b-iv; c-i; d-iii
2. a-iii; b-iv; c-ii; d-i
3. a-iv; b-iii; c-i; d-ii
4. a-i; b-iv; c-ii; d-iii