Question

explain terminal and non - terminal functional groups containing carbon ?

Answer 1

Terminal groups are the one that only occur at end of a carbon chain. Other groups such as Aldehyde (-CHO), Carboxylic acid (-COOH) etc. are terminal groups because they can occur only at the end of the carbon chain.

Answer 2

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Terminal functional groups :
Aldehyde                   -CHO
Carboxylic acid          -COOH
Primary amine            -NH2
Primary amide            -CONH2
Alcohol                       -OH
Acid chloride              -COCl
Sulphonic acid             -SO3H
Nitrile                          -CN
​Isocyanide                   -NC
Nitro                            -NO2
​Nitrite                          -ONO

Non-terminal functional groups

Ketone                                               -CO-
Ester                                                 -COO-
Secondary or tertiary amine               -NH-   or  R3N  (R is alkyl group)
Secondary amide or tertiary amide    -CONH-   or  -CONR2

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