Name : Formula 1) 1, 2 – Dichloro ethane: CH2Cl – CH2Cl 2) 1,5-Dibromo-3-methylpentane: CH2Br – CH2 – CH (CH3) – CH2 – CH2Br 3) 2,3-Dihydroxysuccinic acid dehydrate:  COOH – CH (OH) – CH (OH) – COOH 4) 2 - Chloro - 3 - methylpentane: CH3 – CH2 – CH(CH3) C(Cl) = CH3 Which of the above pairs are correctly matched?

Option 3 : 1, 2 and 3 only

[ alt="SSC images Q.1" src="//storage.googleapis.com/tb-img/production/17/10/SSC_images%20Q.1.PNG" style="height:123px; width:165px">

[ alt="SSC images Q.2" src="//storage.googleapis.com/tb-img/production/17/10/SSC_images%20Q.2.PNG" style="height:144px; width:234px">

[ alt="SSC images Q.3" src="//storage.googleapis.com/tb-img/production/17/10/SSC_images%20Q.3.PNG" style="height:185px; width:222px">

[ alt="SSC images Q.4" src="//storage.googleapis.com/tb-img/production/17/10/SSC_images%20Q.4.PNG">

In 1, 2 and 3, the formula of the skeleton is written correctly. However, in 4^th, there is no double bond hence 4^th option is not correctly matched. Hence the correct answer is option 3.